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Rajput S, Sahoo RK, Sarkar N, Nembenna S. Gallium Hydride-Catalyzed Selective Hydroboration of Unsaturated Organic Substrates. Chempluschem 2024:e202300737. [PMID: 38437065 DOI: 10.1002/cplu.202300737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 03/04/2024] [Accepted: 03/04/2024] [Indexed: 03/06/2024]
Abstract
The first examples of tetrasubstituted conjugated bis-guanidinate (CBG) supported monomeric and thermally stable gallium dihalides [LGaX2], (X=Cl (Ga-Cl), I (Ga-I)) and dihydride (Ga-H) [LGaH2] (where L={(ArHN)(ArN)-C=N-C=(NAr)(NHAr)}; Ar=2,6-Et2-C6H3) compounds are reported. The reaction of in situ generated LLi with 1.0 equiv. GaX3 (X=Cl, I) afforded compounds Ga-Cl and Ga-I. The reaction between Ga-Cl and Li[HBEt3] in benzene yielded the dihydride compound Ga-H. All reported compounds (Ga-Cl, Ga-I, and Ga-H) were characterized by NMR, HRMS, and single-crystal X-ray diffraction studies. Ga-H was probed for the hydroboration of carbodiimides (CDI), isocyanates, and isothiocyanates with HBpin. Compound Ga-H was also found effective for the catalytic hydroboration of imines, nitriles, alkynes, esters, and formates, affording the corresponding products in quantitative yields. Stoichiometric reactions with a CDI were performed to establish the catalytic cycle.
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Affiliation(s)
- Sagrika Rajput
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
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2
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Patro AG, Sahoo RK, Nembenna S. Zinc hydride catalyzed hydroboration of esters. Dalton Trans 2024; 53:3621-3628. [PMID: 38289250 DOI: 10.1039/d3dt04084d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2024]
Abstract
The conjugated bis-guanidinate (CBG)-supported zinc hydride {LZnH}2; L = {(ArHN)(ArN)-CN-C(NAr)(NHAr); Ar = 2,6-Et2-C6H3} (I) is utilized as a catalyst for the hydroboration of esters with pinacolborane (HBpin) under mild reaction conditions. Various aryl and alkyl substrates containing electron-donating, withdrawing, and cyclic groups of esters are effectively converted into alkoxy boronate esters as products upon hydroboration. Furthermore, stoichiometric experiments have been performed to understand the plausible reaction mechanism for the hydroboration of esters. Additionally, complex (I) was used for the hydroboration of carbonate, carboxylic acid, and anhydride substrates to showcase the broad substrate scope.
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Affiliation(s)
- A Ganesh Patro
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI) Bhubaneswar, 752050, India.
| | - Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI) Bhubaneswar, 752050, India.
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI) Bhubaneswar, 752050, India.
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3
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Sahoo RK, Nembenna S. Zinc-Catalyzed Chemoselective Reduction of Nitriles to N-Silylimines through Hydrosilylation: Insights into the Reaction Mechanism. Inorg Chem 2023. [PMID: 37481732 DOI: 10.1021/acs.inorgchem.3c00309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
The N,N'-chelated conjugated bis-guanidinate (CBG) supported zinc hydride (Zn-1) pre-catalyzed highly challenging chemoselective mono-hydrosilylation of a wide range of nitriles to exclusive N-silylimines and/or N,N'-silyldiimines is reported. Furthermore, the effectiveness of pre-catalyst Zn-1 is compared with another pre-catalyst analogue, i.e., DiethylNacNac zinc hydride (Zn-2), to know the ligand effect. We observed that pre-catalyst Zn-1 shows high efficiency and better selectivity than pre-catalyst Zn-2 for reducing nitriles to N-silylimines. Mechanistic studies indicate the insertion of the C≡N bond of nitrile into Zn-H to form the zinc vinylidenamido complexes (Zn-1' and Zn-2'). The active catalysts Zn-1' and Zn-2' are confirmed by NMR, mass spectrometry, and single-crystal X-ray diffraction analyses. A most plausible catalytic cycle has been explored depending on stoichiometric experiments, active catalysts isolation, and in situ studies. Moreover, the synthetic utility of this protocol was demonstrated.
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Affiliation(s)
- Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
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Sahoo RK, Patro AG, Sarkar N, Nembenna S. Zinc Catalyzed Hydroelementation (HE; E = B, C, N, and O) of Carbodiimides: Intermediates Isolation and Mechanistic Insights. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Affiliation(s)
- Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Arukela Ganesh Patro
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
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5
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Sahoo R, Patro AG, Sarkar N, Nembenna S. Comparison of Two Zinc Hydride Precatalysts for Selective Dehydrogenative Borylation of Terminal Alkynes: A Detailed Mechanistic Study. ACS Omega 2023; 8:3452-3460. [PMID: 36713704 PMCID: PMC9878541 DOI: 10.1021/acsomega.2c07381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 12/19/2022] [Indexed: 06/18/2023]
Abstract
The conjugated bis-guanidinate-stabilized zinc hydride complex (I)-precatalyzed chemoselective dehydroborylation of a wide array of terminal alkynes with excellent yields is reported. Further, precatalyst I is compared with a newly synthesized DiethylNacNac zinc hydride precatalyst (III) for selective dehydroborylation of terminal alkynes, and it is discovered that precatalyst I is more active than III. We have studied intra- and intermolecular chemoselective dehydroborylation of terminal alkynes over other reducible functionalities such as alkene, ester, isocyanide, nitro, and heterocycles. The highly efficient precatalyst I shows a turnover number of 48.5 and turnover frequency of up to 60.5 h-1 in the dehydroborylation of 1-ethynyl-4-fluorobenzene (1i). A plausible mechanism for selective dehydrogenative borylation of alkynes has been proposed based on active catalyst isolation and a series of stoichiometric reactions.
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Sarkar N, Kumar Sahoo R, Nembenna S. Aluminium-Catalyzed Selective Hydroboration of Esters and Epoxides to Alcohols: C-O Bond Activation. Chemistry 2023; 29:e202203023. [PMID: 36226774 DOI: 10.1002/chem.202203023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Indexed: 11/07/2022]
Abstract
In this work, the molecular aluminium dihydride complex bearing an N, N'-chelated conjugated bis-guanidinate (CBG) ligand is used as a catalyst for reducing a wide range of aryl and alkyl esters with good tolerance of alkene (C=C), alkyne (C≡C), halides (Cl, Br, I and F), nitrile (C≡N), and nitro (NO2 ) functionalities. Further, we investigated the catalytic application of aluminium dihydride in the C-O bond cleavage of alkyl and aryl epoxides into corresponding branched Markovnikov ring-opening products. In addition, the chemoselective intermolecular reduction of esters over other reducible functional groups, such as amides and alkenes, has been established. Intermediates are isolated and characterized by NMR and HRMS studies, which confirm the probable catalytic cycles for the hydroboration of esters and epoxides.
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Affiliation(s)
- Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
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7
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Sahoo RK, Sarkar N, Nembenna S. Intermediates, Isolation and Mechanistic Insights into Zinc Hydride-Catalyzed 1,2-Regioselective Hydrofunctionalization of N-Heteroarenes. Inorg Chem 2023; 62:304-317. [PMID: 36571301 DOI: 10.1021/acs.inorgchem.2c03389] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The conjugated bis-guanidinate-supported zinc hydride [{LZnH}2; L = {(ArHN) (ArN)-C═N-C═(NAr) (NHAr); Ar = 2,6-Et2-C6H3}] (I)-catalyzed highly demanding exclusive 1,2-regioselective hydroboration and hydrosilylation of N-heteroarenes is demonstrated with excellent yields. This protocol is compatible with many pyridines and N-heteroarene derivatives, including electron-donating and -withdrawing substituents. Catalytic intermediates, such as [(LZnH) (4-methylpyridine)] IIA, [(L'ZnH) (4-methylpyridine) IIA', where L' = CH{(CMe) (2,6-Et2C6H3N)}2)], LZn(1,2-DhiQ) (isoquinoline) III, [L'Zn(1,2-DhiQ) (isoquinoline)] III', and LZn(1,2-(3-MeDHQ)) (3-methylquinoline) V, were isolated and thoroughly characterized by NMR, HRMS, and IR analyses. Furthermore, X-ray single-crystal diffraction studies confirmed the molecular structures of compounds IIA', III, and III'. The NMR data proved that the intermediate III or III' reacted with HBpin and gave a selective 1,2-addition hydroborated product. Stoichiometric experiments suggest that V and III independently reacted with silane, yielding selective 1,2-addition of mono- and bis-hydrosilylated products, respectively. Based on the isolation of intermediates and a series of stoichiometric experiments, plausible catalytic cycles were established. Furthermore, the intermolecular chemoselective hydroboration reaction over other reducible functionalities was studied.
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Affiliation(s)
- Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, Odisha 752 050, India
| | - Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, Odisha 752 050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, Odisha 752 050, India
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8
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Sarkar N, Sahoo RK, Nembenna S. Aluminum‐Catalyzed Selective Reduction of Heteroallenes Through Hydroboration: Amide/Thioamide/Selenoamide Bond Construction and C=X (X= O, S, Se) Bond Activation. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Nabin Sarkar
- NISER: National Institute of Science Education and Research School of Chemical Sciences INDIA
| | - Rajata Kumar Sahoo
- NISER: National Institute of Science Education and Research School of Chemical Sciences INDIA
| | - Sharanappa Nembenna
- National Institute of Science Education and Research (NISER) School of Chemical Sciences Jatni CampusNISER, BhubaneswarINDIA 752050 Bhubaneswar INDIA
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9
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Mukhopadhyay S, Patro AG, Vadavi RS, Nembenna S. Coordination chemistry of main group metals with organic isocyanides. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sayantan Mukhopadhyay
- National Institute of Science Education and Research Schoool of Chemical Sciences INDIA
| | - A Ganesh Patro
- National Institute of Science Education and Research School of Chemical Sciences INDIA
| | - Ramesh S. Vadavi
- National Institute of Science Education and Research School of Chemical Sciences INDIA
| | - Sharanappa Nembenna
- National Institute of Science Education and Research (NISER) School of Chemical Sciences Jatni CampusNISER, BhubaneswarINDIA 752050 Bhubaneswar INDIA
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10
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Nayak DK, Sarkar N, Sampath CM, Sahoo RK, Nembenna S. Organoaluminum Catalyzed Guanylation and Hydroboration Reactions of Carbodiimides. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Deepak Kumar Nayak
- School of Chemical Sciences National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752 050 India
| | - Nabin Sarkar
- School of Chemical Sciences National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752 050 India
| | - Chabathula Manoj Sampath
- School of Chemical Sciences National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752 050 India
| | - Rajata Kumar Sahoo
- School of Chemical Sciences National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752 050 India
| | - Sharanappa Nembenna
- School of Chemical Sciences National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752 050 India
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11
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Khuntia AP, Sarkar N, Patro AG, Sahoo RK, Nembenna S. Germanium Hydride Catalyzed Selective Hydroboration and Cyanosilylation of Ketones. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Anwesh Prasad Khuntia
- National Institute of Science Education and Research School of Chemical Sciences SCS NISERbhubaneswar 752050 bhubaneswar INDIA
| | - Nabin Sarkar
- National Institute of Science Education and Research School of Chemical Sciences INDIA
| | - A Ganesh Patro
- National Institute of Science Education and Research School of Chemical Sciences SCS NISERbhubaneswar 752050 bhubaneswar INDIA
| | - Rajata Kumar Sahoo
- National Institute of Science Education and Research School of Chemical Sciences SCS NISERbhubaneswar 752050 bhubaneswar INDIA
| | - Sharanappa Nembenna
- National Institute of Science Education and Research (NISER) School of Chemical Sciences Jatni CampusNISER, BhubaneswarINDIA 752050 Bhubaneswar INDIA
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12
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Sarkar N, Kumar Sahoo R, Ganesh Patro A, Nembenna S. Aluminum-Catalyzed Selective Hydroboration of Carbonyls and Dehydrocoupling of Alcohols, Phenols, Amines, Thiol, Selenol, Silanols with HBpin. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Sarkar N, Sahoo RK, Mukhopadhyay S, Nembenna S. Organoaluminum Cation Catalyzed Selective Hydrosilylation of Carbonyls, Alkenes, and Alkyne. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202101030] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Nabin Sarkar
- National Institute of Science Education and Research School of Chemical Sciences SCS NISERbhubaneswar 752050 bhubaneswar INDIA
| | - Rajata Kumar Sahoo
- National Institute of Science Education and Research School of Chemical Sciences SCS NISERbhubaneswar 752050 bhubaneswar INDIA
| | - Sayantan Mukhopadhyay
- National Institute of Science Education and Research School of Chemical Sciences SCS NISERbhubaneswar 752050 bhubaneswar INDIA
| | - Sharanappa Nembenna
- National Institute of Science Education and Research (NISER) School of Chemical Sciences Jatni CampusNISER, BhubaneswarINDIA 752050 Bhubaneswar INDIA
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14
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Sahoo RK, Rajput S, Patro AG, Nembenna S. Synthesis of low oxidation state zinc(I) complexes and their catalytic studies in dehydroborylation of terminal alkynes. Dalton Trans 2022; 51:16009-16016. [DOI: 10.1039/d2dt02846h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new example of structurally characterized conjugated bis-guanidinate (CBG) supported zinc (I) dimer, i.e., LZnZnL (3) (L = {(ArNH)(ArN)–C=N–C=(NAr)(NHAr)}; Ar = 2,6-Et2-C6H3)) with a Zn-Zn bond is reported. Moreover, homoleptic...
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Peddarao T, Baishya A, Sarkar N, Acharya R, Nembenna S. Conjugated Bis‐Guanidines (CBGs) as
β
‐Diketimine Analogues: Synthesis, Characterization of CBGs/Their Lithium Salts and CBG Li Catalyzed Addition of B−H and TMSCN to Carbonyls. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100141] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Thota Peddarao
- School of Chemical Sciences National Institute of Science Education and Research (NISER) Homi Bhabha National Institute (HBNI) Bhubaneswar 752050 India
| | - Ashim Baishya
- School of Chemical Sciences National Institute of Science Education and Research (NISER) Homi Bhabha National Institute (HBNI) Bhubaneswar 752050 India
| | - Nabin Sarkar
- School of Chemical Sciences National Institute of Science Education and Research (NISER) Homi Bhabha National Institute (HBNI) Bhubaneswar 752050 India
| | - Rudresh Acharya
- School of Biological Sciences National Institute of Science Education and Research (NISER) Homi Bhabha National Institute (HBNI) Bhubaneswar 752050 India
| | - Sharanappa Nembenna
- School of Chemical Sciences National Institute of Science Education and Research (NISER) Homi Bhabha National Institute (HBNI) Bhubaneswar 752050 India
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Sahoo RK, Sarkar N, Nembenna S. Zinc Hydride Catalyzed Chemoselective Hydroboration of Isocyanates: Amide Bond Formation and C=O Bond Cleavage. Angew Chem Int Ed Engl 2021; 60:11991-12000. [PMID: 33638314 DOI: 10.1002/anie.202100375] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 02/16/2021] [Indexed: 12/15/2022]
Abstract
Herein, a remarkable conjugated bis-guanidinate (CBG) supported zinc hydride, [{LZnH}2 ; L={(ArHN)(ArN)-C=N-C=(NAr)(NHAr); Ar=2,6-Et2 -C6 H3 }] (I) catalyzed partial reduction of heteroallenes via hydroboration is reported. A large number of aryl and alkyl isocyanates, including electron-donating and withdrawing groups, undergo reduction to obtain selectively N-boryl formamide, bis(boryl) hemiaminal and N-boryl methyl amine products. The compound I effectively catalyzes the chemoselective reduction of various isocyanates, in which the construction of the amide bond occurs. Isocyanates undergo a deoxygenation hydroboration reaction, in which the C=O bond cleaves, leading to N-boryl methyl amines. Several functionalities such as nitro, cyano, halide, and alkene groups are well-tolerated. Furthermore, a series of kinetic, control experiments and structurally characterized intermediates suggest that the zinc hydride species are responsible for all reduction steps and breaking the C=O bond.
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Affiliation(s)
- Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
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Abstract
Three new dimeric bis-guanidinate zinc(II) alkyl, halide, and hydride complexes [LZnEt]2 (1), [LZnI]2 (2) and [LZnH]2 (3) were prepared. Compound 3 was successfully employed for the hydrosilylation and hydroboration of a vast number of ketones. The catalytic performance of 3 in the hydroboration of acetophenone exhibits a turnover frequency, reaching up to 5800 h-1, outperforming that of reported zinc hydride catalysts. Notably, both intra- and intermolecular chemoselective hydrosilylation and hydroboration reactions have been investigated.
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Affiliation(s)
- Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Mamata Mahato
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Achintya Jana
- Undergraduate Programme, Indian Institute of Science, Bangalore 560 012, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
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18
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Affiliation(s)
- Nabin Sarkar
- School of Chemical Sciences National Institute of Science Education and Research (NISER) Homi Bhabha National Institute (HBNI) 752050 Bhubaneswar India
| | - Mamata Mahato
- School of Chemical Sciences National Institute of Science Education and Research (NISER) Homi Bhabha National Institute (HBNI) 752050 Bhubaneswar India
| | - Sharanappa Nembenna
- School of Chemical Sciences National Institute of Science Education and Research (NISER) Homi Bhabha National Institute (HBNI) 752050 Bhubaneswar India
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19
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Peddarao T, Sarkar N, Nembenna S. Mono- and Bimetallic Aluminum Alkyl, Alkoxide, Halide and Hydride Complexes of a Bulky Conjugated Bis-Guanidinate(CBG) Ligand and Aluminum Alkyls as Precatalysts for Carbonyl Hydroboration. Inorg Chem 2020; 59:4693-4702. [PMID: 32157882 DOI: 10.1021/acs.inorgchem.9b03778] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Tetra-aryl-substituted symmetrical conjugated bis-guanidine (CBG) ligands such as L1-3 (3H) [L(3H) = {(ArHN)(ArHN)C═N-C═NAr(NHAr)}; Ar = 2,6-Me2-C6H3 (L1(3H)), 2,6-Et2-C6H3 (L2(3H)), and 2,6-iPr2-C6H3 (L3(3H))] have been employed to synthesize a series of four- and six-membered aluminum heterocycles (1-8) for the first time. Generally, aluminum complexes bearing N,N'- chelated guanidinate and β-diketiminate/dipyrromethene ligand systems form four- and six-membered heterocycles, respectively. However, the conjugated bis-guanidine ligand has the capability of forming both four- and six-membered heterocycles possessing multimetal centers within the same molecule; this is due to the presence of three acidic protons, which can be easily deprotonated (at least two protons) upon treatment with metal reagents. Both mono- and dinuclear aluminum alkyls and mononuclear aluminum alkoxide, halide, and hydride complexes have been structurally characterized. Further, we have demonstrated the potential of mononuclear, six-membered CBG aluminum dialkyls in catalytic hydroboration of a broad range of aldehydes and ketones with pinacolborane (HBpin).
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Affiliation(s)
- Thota Peddarao
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
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20
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Affiliation(s)
- Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050 India
| | - Subhadeep Bera
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050 India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050 India
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21
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Patagar D, Kusanur R, Sitwala ND, Ghate MD, Saravanakumar S, Nembenna S, Gediya PA. Synthesis of Novel 4‐Substituted Coumarins, Docking Studies, and DHODH Inhibitory Activity. J Heterocycl Chem 2019. [DOI: 10.1002/jhet.3644] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Dayanand Patagar
- Syngene International Ltd Bommasandra Indl Area Bengaluru 560099 India
- Department of ChemistryRV College of Engineering Mysore Road Bengaluru 560059 India
| | - Raviraj Kusanur
- Department of ChemistryRV College of Engineering Mysore Road Bengaluru 560059 India
| | - Nikum D. Sitwala
- Department of Pharmaceutical Chemistry, Institute of PharmacyNirma University Ahmedabad 382481 India
| | - Manjunath D. Ghate
- Department of Pharmaceutical Chemistry, Institute of PharmacyNirma University Ahmedabad 382481 India
| | | | - Sharanappa Nembenna
- School of ChemistryNational Institute of Science Education and Research Bhubaneshwar 752050 India
| | - Piyush A. Gediya
- Department of Pharmaceutical Chemistry, Institute of PharmacyNirma University Ahmedabad 382481 India
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22
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Baishya A, Kumar L, Barman MK, Biswal HS, Nembenna S. N-Heterocyclic Carbene–Carbodiimide (“NHC–CDI”) Adduct or Zwitterionic-Type Neutral Amidinate-Supported Magnesium(II) and Zinc(II) Complexes. Inorg Chem 2017; 56:9535-9546. [DOI: 10.1021/acs.inorgchem.7b00879] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ashim Baishya
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Lokesh Kumar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Milan Kr. Barman
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Himansu S. Biswal
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
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23
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Abstract
Heteroleptic organomagnesium complex pre-catalyzed cross-dehydrocoupling of silanes with amines.
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Affiliation(s)
- Ashim Baishya
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- HBNI
- Bhubaneswar
- India 752050
| | - Thota Peddarao
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- HBNI
- Bhubaneswar
- India 752050
| | - Sharanappa Nembenna
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- HBNI
- Bhubaneswar
- India 752050
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24
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Abstract
Cheaper, inexpensive alkaline-earth metal amides as efficient pre-catalysts for the selective hydroboration of a large number of esters.
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Affiliation(s)
- Milan Kr. Barman
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- HBNI
- Bhubaneswar 752050
- India
| | - Ashim Baishya
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- HBNI
- Bhubaneswar 752050
- India
| | - Sharanappa Nembenna
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- HBNI
- Bhubaneswar 752050
- India
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25
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Abstract
The well-defined aluminum monohydride compound [{(2,4,6-Me3-C6H2)NC(Me)}2(Me)(H)]AlH·(NMe2Et) (1) catalyzes hydroboration of a wide range of aldehydes and ketones under mild reaction conditions. Moreover, compound 1 displayed chemoselective hydroboration of aldehydes over ketones at rt.
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Affiliation(s)
- Vineet Kumar Jakhar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) , Bhubaneswar 752 050, India
| | - Milan Kr Barman
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) , Bhubaneswar 752 050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) , Bhubaneswar 752 050, India
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26
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Baishya A, Kumar L, Barman MK, Peddarao T, Nembenna S. Air Stable N-Heterocyclic Carbene-Carbodiimide (“NHC-CDI”) Adducts: Zwitterionic Type Bulky Amidinates. ChemistrySelect 2016. [DOI: 10.1002/slct.201600019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Ashim Baishya
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); IOP Campus, Sachivalaya Marg Bhubaneswar 751005 Odisha India
| | - Lokesh Kumar
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); IOP Campus, Sachivalaya Marg Bhubaneswar 751005 Odisha India
| | - Milan Kr. Barman
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); IOP Campus, Sachivalaya Marg Bhubaneswar 751005 Odisha India
| | - Thota Peddarao
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); IOP Campus, Sachivalaya Marg Bhubaneswar 751005 Odisha India
| | - Sharanappa Nembenna
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); IOP Campus, Sachivalaya Marg Bhubaneswar 751005 Odisha India
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27
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Peddarao T, Baishya A, Barman MK, Kumar A, Nembenna S. Metal-free access of bulky N,N′-diarylcarbodiimides and their reduction: bulky N,N′-diarylformamidines. NEW J CHEM 2016. [DOI: 10.1039/c6nj00907g] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile synthetic protocol for the preparation of N,N′-diarylcarbodiimides and their reduction with sodium borohydride in ethanol to obtain N,N′-diarylformamidines has been demonstrated.
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Affiliation(s)
- Thota Peddarao
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar
- India
| | - Ashim Baishya
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar
- India
| | - Milan Kr. Barman
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar
- India
| | - Ajay Kumar
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar
- India
| | - Sharanappa Nembenna
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar
- India
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28
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Abstract
The oxidative addition of chalcogens (S and Se) to the guanidinate supported Ge(ii) and Sn(ii) amide complexes.
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Affiliation(s)
- Milan Kr. Barman
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER) Bhubaneswar
- India 751005
| | - Sharanappa Nembenna
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER) Bhubaneswar
- India 751005
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29
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Abstract
Catalyst free direct addition of cyclic secondary amines to various N,N′-bisaryl substituted carbodiimides led to the formation of bulky guanidines. Furthermore, two equivalents of N,N′-bisaryl substituted carbodiimides upon treatment with piperazine led to the formation of bis guanidines.
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Affiliation(s)
- Ashim Baishya
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar
- India
| | - Thota Peddarao
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar
- India
| | - Milan Kr. Barman
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar
- India
| | - Sharanappa Nembenna
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar
- India
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30
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Barman MK, Baishya A, Peddarao T, Nembenna S. Guanidinate stabilized germanium(II) and tin(II) amide complexes and their catalytic activity for aryl isocyanate cyclization. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.09.030] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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31
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32
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Mukherjee A, Nembenna S, Sen TK, Sarish SP, Ghorai PK, Ott H, Stalke D, Mandal SK, Roesky HW. Assembling Zirconium and Calcium Moieties through an Oxygen Center for an Intramolecular Hydroamination Reaction: A Single System for Double Activation. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201100022] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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33
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Mukherjee A, Nembenna S, Sen TK, Sarish SP, Ghorai PK, Ott H, Stalke D, Mandal SK, Roesky HW. Assembling Zirconium and Calcium Moieties through an Oxygen Center for an Intramolecular Hydroamination Reaction: A Single System for Double Activation. Angew Chem Int Ed Engl 2011; 50:3968-72. [DOI: 10.1002/anie.201100022] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Revised: 01/27/2011] [Indexed: 11/07/2022]
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34
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Sarish SP, Nembenna S, Nagendran S, Roesky HW. Chemistry of soluble β-diketiminatoalkaline-earth metal complexes with M-X bonds (M=Mg, Ca, Sr; X=OH, Halides, H). Acc Chem Res 2011; 44:157-70. [PMID: 21247094 DOI: 10.1021/ar100103h] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Victor Grignard's Nobel Prize-winning preparation of organomagnesium halides (Grignard reagents) marked the formal beginning of organometallic chemistry with alkaline earth metals. Further development of this invaluable synthetic route, RX+Mg→RMgX, with the heavier alkaline earth metals (Ca and Sr) was hampered by limitations in synthetic methodologies. Moreover, the lack of suitable ligands for stabilizing the reactive target molecules, particularly with the more electropositive Ca and Sr, was another obstacle. The absence in the literature, until just recently, of fundamental alkaline earth metal complexes with M-H, M-F, and M-OH (where M is the Group 2 metal Mg, Ca, or Sr) bonds amenable for organometallic reactions is remarkable. The progress in isolating various unstable compounds of p-block elements with β-diketiminate ligands was recently applied to Group 2 chemistry. The monoanionic β-diketiminate ligands are versatile tools for addressing synthetic challenges, as amply demonstrated with alkaline earth complexes: the synthesis and structural characterization of soluble β-diketiminatocalcium hydroxide, β-diketiminatostrontium hydroxide, and β-diketiminatocalcium fluoride are just a few examples of our contribution to this area of research. To advance the chemistry beyond synthesis, we have investigated the reactivity and potential for applications of these species, for example, through the demonstration of dip coating surfaces with CaCO(3) and CaF(2) with solutions of the calcium hydroxide and calcium fluoride complexes, respectively. In this Account, we summarize some recent developments in alkaline earth metal complex chemistry, particularly of Mg, Ca, and Sr, through the utilization of β-diketiminate ligands. We focus on results generated in our laboratory but give due mention to work from other groups as well. We also highlight the closely related chemistry of the Group 12 element Zn, as well as the important chemistry developed by other groups using the complexes we have reported. Although Mg and Ca are more abundant in living organisms, no other metal has as many biological functions as Zn. Thus Zn, the nontoxic alternative to the heavier Group 12 elements Cd and Hg, occupies a unique position ripe for further exploration.
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Affiliation(s)
| | - Sharanappa Nembenna
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Selvarajan Nagendran
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110 016, India
| | - Herbert W. Roesky
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
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35
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Jones C, Furness L, Nembenna S, Rose RP, Aldridge S, Stasch A. Bulky guanidinato and amidinato zinc complexes and their comparative stabilities. Dalton Trans 2010; 39:8788-95. [DOI: 10.1039/c0dt00589d] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Bonyhady S, Jones C, Nembenna S, Stasch A, Edwards A, McIntyre G. β-Diketiminate-Stabilized Magnesium(I) Dimers and Magnesium(II) Hydride Complexes: Synthesis, Characterization, Adduct Formation, and Reactivity Studies. Chemistry 2009; 16:938-55. [DOI: 10.1002/chem.200902425] [Citation(s) in RCA: 325] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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37
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Sarish S, Nembenna S, Roesky H, Ott H, Pal A, Stalke D, Dutta S, Pati S. Soluble Molecular Dimers of CaO and SrO Stabilized by a Lewis Acid. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200904054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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38
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Sarish S, Nembenna S, Roesky H, Ott H, Pal A, Stalke D, Dutta S, Pati S. Soluble Molecular Dimers of CaO and SrO Stabilized by a Lewis Acid. Angew Chem Int Ed Engl 2009; 48:8740-2. [DOI: 10.1002/anie.200904054] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Bonyhady S, Green S, Jones C, Nembenna S, Stasch A. A Dimeric Magnesium(I) Compound as a Facile Two-Center/Two-Electron Reductant. Angew Chem Int Ed Engl 2009; 48:2973-7. [DOI: 10.1002/anie.200900331] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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40
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Bonyhady S, Green S, Jones C, Nembenna S, Stasch A. A Dimeric Magnesium(I) Compound as a Facile Two-Center/Two-Electron Reductant. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200900331] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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41
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Nembenna S, Singh S, Jana A, Roesky HW, Yang Y, Ye H, Ott H, Stalke D. Preparation and Structural Characterization of Molecular Al−O−Sn(II) and Al−O−Sn(IV) Compounds. Inorg Chem 2009; 48:2273-6. [DOI: 10.1021/ic802151c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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42
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Sarish S, Nembenna S, Nagendran S, Roesky HW, Pal A, Herbst-Irmer R, Ringe A, Magull J. A Reactivity Change of a Strontium Monohydroxide by Umpolung to an Acid. Inorg Chem 2008; 47:5971-7. [DOI: 10.1021/ic800284u] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Sharanappa Nembenna
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Selvarajan Nagendran
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Herbert W. Roesky
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Aritra Pal
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Regine Herbst-Irmer
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Arne Ringe
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Jörg Magull
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
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43
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Singh S, Nembenna S, Jancik V, Roesky HW. Antimony Amide Oxide and Antimony Chloride Oxide Wrapped in an Organoaluminum Framework. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200701219] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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44
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Pineda LW, Jancik V, Nembenna S, Roesky HW. Synthetic and Structural Studies of Lead and Bismuth Organohalides Bearing aβ-Diketiminato Ligand. Z Anorg Allg Chem 2007. [DOI: 10.1002/zaac.200600325] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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45
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Nehete UN, Roesky HW, Zhu H, Nembenna S, Schmidt HG, Noltemeyer M, Dmitrij Bogdanov, andKonrad Samwer:. Polyhedral Cobalt(II) and Iron(II) Siloxanes: Synthesis and X-ray Crystal Structure of [(RSi(OH)O 2)Co(OPMe 3)] 4 and [(RSiO 3) 2-(RSi(OH)O 2) 4(μ 3-OH) 2Fe 8(THF) 4] (R = (2,6- iPr 2C 6H 3)N(SiMe 3)). Inorg Chem 2007. [DOI: 10.1021/ic700750r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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46
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Nehete UN, Roesky HW, Zhu H, Nembenna S, Schmidt HG, Noltemeyer M, Bogdanov D, Samwer K. Polyhedral Cobalt(II) and Iron(II) Siloxanes: Synthesis and X-ray Crystal Structure of [(RSi(OH)O 2)Co(OPMe 3)] 4 and [(RSiO 3) 2(RSi(OH)-O 2) 4-(μ 3-OH) 2Fe 8(THF) 4] (R = (2,6- iPr 2C 6H 3)N(SiMe 3)). Inorg Chem 2007. [DOI: 10.1021/ic700481w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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Nembenna S, Roesky H, Nagendran S, Hofmeister A, Magull J, Wilbrandt PJ, Hahn M. A Well-Defined Hydrocarbon-Soluble Calcium Monofluoride, [{LCaF(thf)}2]: The Application of Soluble Calcium Derivatives for Surface Coating. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200604447] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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48
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Nembenna S, Roesky HW, Nagendran S, Hofmeister A, Magull J, Wilbrandt PJ, Hahn M. A Well-Defined Hydrocarbon-Soluble Calcium Monofluoride, [{LCaF(thf)}2]: The Application of Soluble Calcium Derivatives for Surface Coating. Angew Chem Int Ed Engl 2007; 46:2512-4. [PMID: 17318933 DOI: 10.1002/anie.200604447] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sharanappa Nembenna
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
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49
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Ruspic C, Nembenna S, Hofmeister A, Magull J, Harder S, Roesky HW. A Well-Defined Hydrocarbon-Soluble Calcium Hydroxide: Synthesis, Structure, and Reactivity. J Am Chem Soc 2006; 128:15000-4. [PMID: 17105312 DOI: 10.1021/ja065631t] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Controlled hydrolysis of a (beta-diketiminate)calcium-amide gave a heteroleptic (beta-diketiminate)calcium-hydroxide complex that is remarkably stable against ligand exchange and formation of Ca(OH)2. The structure of this dimeric complex shows OH- units that symmetrically bridge the Ca2+ ions. This hydrocarbon-soluble calcium hydroxide reacted rapidly with CO2 to produce a gel from which amorphous CaCO3 slowly separated. This reaction behavior allows for sol-gel coating with CaCO3 from an organic solvent. Reaction with benzophenone did not lead to nucleophilic attack of OH- to the carbonyl but gave a red benzophenone adduct instead.
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Affiliation(s)
- Christian Ruspic
- Anorganische Chemie, Universität Duisburg-Essen, Universitätsstrasse 5-7, 45117 Essen, Germany
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50
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Nembenna S, Roesky HW, Mandal SK, Oswald RB, Pal A, Herbst-Irmer R, Noltemeyer M, Schmidt HG. Soluble Molecular Compounds with the Mg−O−Al Structural Motif: A Model Approach for the Fixation of Organometallics on a MgO Surface. J Am Chem Soc 2006; 128:13056-7. [PMID: 17017777 DOI: 10.1021/ja064460p] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report a facile route to the molecular compounds with the Mg-O-Al structural motif. The reaction of Mg[N(SiMe3)2]2 (1) with a stoichiometric amount of LAlOH(Me) (2) [L = CH{(CMe)(2,6-iPr2C6H3N)}2] in THF/n-hexane at 0 degrees C results in the formation of the heterobimetallic compound (Me3Si)2NMg(THF)2-O-Al(Me)L (3) in high yield. The similar reaction of 1 equiv of Mg[N(SiMe3)2]2 and 2 equiv of LAlOH(Me) results in the formation of trimetallic compound L(Me)Al-O-Mg(THF)2-O-Al(Me)L (4). Structural analyses of 3 and 4 have been carried out, revealing the presence of the Mg-O-Al motif. A tentative assignment of the Mg-O-Al vibrations has been made and was supported by calculations.
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Affiliation(s)
- Sharanappa Nembenna
- Institute of Inorganic Chemistry, University of Goettingen, Tammannstrasse 4, D-37077 Goettingen, Germany
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