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Chauhan P, Chauhan A, Shankar R. Carbon-Sulfur Bond Cleavage in Methanesulfonate on Diorganotin Quinaldate Platform - Synthesis and Characterization of [(n-Bu 2SnL) 2SO 4]. Chem Asian J 2024; 19:e202400013. [PMID: 38353128 DOI: 10.1002/asia.202400013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 02/13/2024] [Indexed: 02/29/2024]
Abstract
The synthesis of mixed ligand di-n-butyltin complexes, [(n-Bu2SnL1-3)2SO4], 2-4 (HL1-3=2-quinoline/ 1-isoquinoline/ 4-methoxy-2-quinoline carboxylic acid) has been realized by reacting n-Bu2Sn(OMe)OSO2Me, 1 a with the corresponding quinaldic acid under solvothermal conditions. The observed transformation of methane sulfonate to sulfate anion represents a rare example of C-S bond cleavage on the organotin scaffolds, n-Bu2Sn(L1-3)OSO2Me, which have been identified as en route intermediates by NMR and X-ray crystallography. Analogous reaction when extended with Me2Sn(OMe)OSO2Me, 1 b and HL2 yields [(Me2Sn)2(L2)3(OSO2Me)], 5 as partially disproportionated product of Me2Sn(L2)OSO2Me. The solid-state structures of 2-5 reveal variable modes of coordination of the ligands to afford molecular and polymeric motifs.
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Affiliation(s)
- Priyanka Chauhan
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Aishwarya Chauhan
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Ravi Shankar
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
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2
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Prakash R, Joseph J, Andrews AP, Varghese B, Venugopal A. From Sn(II) to Sn(IV): Enhancing Lewis Acidity Via Oxidation. Inorg Chem 2023; 62:14828-14832. [PMID: 37676732 DOI: 10.1021/acs.inorgchem.3c01911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
We demonstrate the increased Lewis acidity on going from Sn(II) to Sn(IV) by oxidizing TpMe2SnOTf (OTf = SO3CF3) to TpMe2SnF(OTf)2. Replacement of the fluoride ion in TpMe2SnF(OTf)2 by a triflate, resulting in TpMe2Sn(OTf)3 further enhances the Lewis acidity at tin. 119Sn NMR spectroscopy, modified Gutmann-Beckett test, computational analysis, and catalytic phosphine oxide deoxygenation support the claims.
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Affiliation(s)
- Rini Prakash
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura Thiruvananthapuram 695551, Kerala, India
| | - Jerin Joseph
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura Thiruvananthapuram 695551, Kerala, India
| | - Alex P Andrews
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura Thiruvananthapuram 695551, Kerala, India
| | - Babu Varghese
- Sophisticated Analytical Instruments Facility, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Ajay Venugopal
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura Thiruvananthapuram 695551, Kerala, India
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3
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Paparakis A, Turnell-Ritson RC, Sapsford JS, Ashley AE, Hulla M. Tin-catalyzed reductive coupling of amines with CO 2 and H 2. Catal Sci Technol 2023. [DOI: 10.1039/d2cy01659a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Tin-based FLPs catalyze reductive coupling reactions of amines with CO2 and H2. Water produced by the reaction is well tolerated and TONs up to 300 can be achieved.
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Affiliation(s)
- Alexandros Paparakis
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Prague 128 00, Czech Republic
| | | | - Joshua S. Sapsford
- Department of Chemistry, White City Campus, Imperial College London, London W12 0BZ, UK
| | - Andrew E. Ashley
- Department of Chemistry, White City Campus, Imperial College London, London W12 0BZ, UK
| | - Martin Hulla
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Prague 128 00, Czech Republic
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4
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Donath M, Schwedtmann K, Schneider T, Hennersdorf F, Bauzá A, Frontera A, Weigand JJ. Direct conversion of white phosphorus to versatile phosphorus transfer reagents via oxidative onioation. Nat Chem 2022; 14:384-391. [PMID: 35379968 DOI: 10.1038/s41557-022-00913-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 02/18/2022] [Indexed: 01/09/2023]
Abstract
The main feedstock for the value-added phosphorus chemicals used in industry and research is white phosphorus (P4), from which the key intermediate for forming P(III) compounds is PCl3. Owing to its high reactivity, syntheses based on PCl3 are often accompanied by product mixtures and laborious work-up procedures, so an alternative process to form a viable P(III) transfer reagent is desirable. Our concept of oxidative onioation, where white phosphorus is selectively converted into triflate salts of versatile P1 transfer reagents such as [P(LN)3][OTf]3 (LN is a cationic, N-based substituent; that is, 4-dimethylaminopyridinio), provides a convenient alternative for the implementation of P-O, P-N and P-C bonds while circumventing the use of PCl3. We use p-block element compounds of type RnE (for example, Ph3As or PhI) to access weak adducts between nitrogen Lewis bases LN and the corresponding dications [RnELN]2+. The proposed equilibrium between [RnELN]2+ + LN and [RnE(LN)2]2+ allows for the complete oxidative onioation of all six P-P bonds in P4 to yield highly reactive and versatile trications [P(LN)3]3+.
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Affiliation(s)
- Maximilian Donath
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, Germany
| | - Kai Schwedtmann
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, Germany
| | - Tobias Schneider
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, Germany
| | - Felix Hennersdorf
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, Germany
| | - Antonio Bauzá
- Department of Chemistry, Universitat de les Illes Balears, Palma de Mallorca, Spain
| | - Antonio Frontera
- Department of Chemistry, Universitat de les Illes Balears, Palma de Mallorca, Spain
| | - Jan J Weigand
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, Germany.
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5
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Sarkar P, Das S, Pati SK. Recent Advances in Group 14 and 15 Lewis Acids for Frustrated Lewis Pair Chemistry. Chem Asian J 2022; 17:e202200148. [PMID: 35320614 DOI: 10.1002/asia.202200148] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 03/22/2022] [Indexed: 11/10/2022]
Abstract
Frustrated Lewis pairs (FLP) which rely on the cooperative action of Lewis acids and Lewis bases, played a prominent role in the advancement of main-group catalysis. While the early days of FLP chemistry witnessed the dominance of boranes, there is a growing body of reports on alternative Lewis acids derived from groups 14 and 15. This short review focuses on the discovery of such non-boron candidates reported since 2015.
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Affiliation(s)
- Pallavi Sarkar
- Jawaharlal Nehru Centre for Advanced Scientific Research, Theoretical Sciences Unit, INDIA
| | - Shubhajit Das
- Jawaharlal Nehru Centre for Advanced Scientific Research, New Chemstry Unit, INDIA
| | - Swapan K Pati
- JNCASR, Theoretical Sciences Unit and New Chemistry Unit, Jakkur Campus, 560064, Bangalore, INDIA
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6
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Sarkar P, Das S, Pati SK. Investigating Tetrel-Based Neutral Frustrated Lewis Pairs for Hydrogen Activation. Inorg Chem 2021; 60:15180-15189. [PMID: 34590831 DOI: 10.1021/acs.inorgchem.1c01543] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Tetrel Lewis acids are a prospective alternative to commonly employed neutral boranes in frustrated Lewis pair (FLP) chemistry. While cationic tetrylium Lewis acids, being isolobal and iso(valence)electronic, are a natural replacement to boranes, neutral tetrel Lewis acids allude as less trivial options due to the absence of a formally empty p orbital on the acceptor atom. Recently, a series of intramolecular geminal FLPs (C2F5)3E-CH2-P(tBu)2 (E = Si, Ge, Sn) featuring neutral tetrel atoms as acceptor sites has been reported for activation of small molecules including H2. In this work, through density functional theory computations, we elucidate the general mechanistic picture of H2 activation by this family of FLPs. Our findings reveal that the acceptor atom derives the required Lewis acidity utilizing the antibonding orbitals of its adjacent bonds with the individual contributions depending on the identity of the acceptor and the donor atoms. By varying the identity of the Lewis acid and Lewis base sites and attached substituents, we unravel their interplay on the energetics of the H2 activation. We find that switching the donor site from P to N significantly affects the synchronous nature of the bond breaking/formations along the reaction pathway, and as a result, N-bearing FLPs have a more favorable H2 activation profile than those with P. Our results are quantitatively discussed in detail within the framework of the activation-strain model of reactivity along with the energy-decomposition analysis method. Finally, the reductive elimination decomposition route pertinent to the plausible extension of the H2 activation to catalytic hydrogenation by these FLPs is also examined.
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Affiliation(s)
- Pallavi Sarkar
- Theoretical Sciences Unit, School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Shubhajit Das
- Theoretical Sciences Unit, School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Swapan K Pati
- Theoretical Sciences Unit, School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
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Sapsford JS, Csókás D, Turnell-Ritson RC, Parkin LA, Crawford AD, Pápai I, Ashley AE. Transition Metal-Free Direct Hydrogenation of Esters via a Frustrated Lewis Pair. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01940] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
| | - Dániel Csókás
- Research Center for Natural Sciences, Institute of Organic Chemistry, Budapest H-1117, Hungary
| | | | - Liam A. Parkin
- Molecular Sciences Research Hub, Imperial College, London W12 0BZ, U.K
| | | | - Imre Pápai
- Research Center for Natural Sciences, Institute of Organic Chemistry, Budapest H-1117, Hungary
| | - Andrew E. Ashley
- Molecular Sciences Research Hub, Imperial College, London W12 0BZ, U.K
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Das S, Pati SK. Computational Exploration of Intramolecular Sn/N Frustrated Lewis Pairs for Hydrogen Activation and Catalytic Hydrogenation. Organometallics 2021. [DOI: 10.1021/acs.organomet.0c00701] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Shubhajit Das
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Swapan K. Pati
- Theoretical Sciences Unit and New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
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