1
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Wang X, Zhong J, Luo M, Zeng X. Cr-Catalyzed Intramolecular Arylative Cross-Coupling of Unactivated C-H Bonds with C-Halide Bonds. Org Lett 2024; 26:4093-4097. [PMID: 38717255 DOI: 10.1021/acs.orglett.4c01145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
We report here a chromium-catalyzed intramolecular arylation of unactivated C-H bonds with C-halide bonds under mild conditions. This reaction was enabled by using a low-cost CrCl2 salt as the precatalyst in combination with allylmagnesium bromide and E/Z-mixed 1-halo-2-styrylarenes as substates, providing a strategy for the construction of functionalized phenanthrene compounds without using external ligands.
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Affiliation(s)
- Xuelan Wang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Jiaoyue Zhong
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Meiming Luo
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Xiaoming Zeng
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
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2
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Kehoe RA, Lowry A, Light ME, Jones DJ, Byrne PA, McGlacken GP. Regioselective Partial Hydrogenation and Deuteration of Tetracyclic (Hetero)aromatic Systems Using a Simple Heterogeneous Catalyst. Chemistry 2024; 30:e202400102. [PMID: 38214926 DOI: 10.1002/chem.202400102] [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: 01/10/2024] [Revised: 01/12/2024] [Accepted: 01/12/2024] [Indexed: 01/13/2024]
Abstract
The introduction of added '3-dimensionality' through late-stage functionalisation of extended (hetero)aromatic systems is a powerful synthetic approach. The abundance of starting materials and cross-coupling methodologies to access the precursors allows for highly diverse products. Subsequent selective partial reduction can alter the core structure in a manner of interest to medicinal chemists. Herein, we describe the precise, partial reduction of multicyclic heteroaromatic systems using a simple heterogeneous catalyst. The approach can be extended to introduce deuterium (again at late-stage). Excellent yields can be obtained using simple reaction conditions.
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Affiliation(s)
- Roberta A Kehoe
- School of Chemistry, Analytical and Biological Chemistry Research Facility, University College Cork, Robert Kane Building, Western Road, Cork
- Synthesis and Solid State Pharmaceutical Centre (SSPC), University of Limerick, Limerick
| | - Amy Lowry
- School of Chemistry, Analytical and Biological Chemistry Research Facility, University College Cork, Robert Kane Building, Western Road, Cork
| | - Mark E Light
- Department of Chemistry, University of, Southampton, SO17 1BJ, United Kingdom
| | - David J Jones
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph-Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Peter A Byrne
- Synthesis and Solid State Pharmaceutical Centre (SSPC), University of Limerick, Limerick
- Centre for Synthesis and Chemical Biology, School of Chemistry, University College Dublin Belfield, Dublin 4, Ireland
| | - Gerard P McGlacken
- School of Chemistry, Analytical and Biological Chemistry Research Facility, University College Cork, Robert Kane Building, Western Road, Cork
- Synthesis and Solid State Pharmaceutical Centre (SSPC), University of Limerick, Limerick
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3
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Landaeta VR, Horsley Downie TM, Wolf R. Low-Valent Transition Metalate Anions in Synthesis, Small Molecule Activation, and Catalysis. Chem Rev 2024; 124:1323-1463. [PMID: 38354371 PMCID: PMC10906008 DOI: 10.1021/acs.chemrev.3c00121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 10/09/2023] [Accepted: 10/09/2023] [Indexed: 02/16/2024]
Abstract
This review surveys the synthesis and reactivity of low-oxidation state metalate anions of the d-block elements, with an emphasis on contributions reported between 2006 and 2022. Although the field has a long and rich history, the chemistry of transition metalate anions has been greatly enhanced in the last 15 years by the application of advanced concepts in complex synthesis and ligand design. In recent years, the potential of highly reactive metalate complexes in the fields of small molecule activation and homogeneous catalysis has become increasingly evident. Consequently, exciting applications in small molecule activation have been developed, including in catalytic transformations. This article intends to guide the reader through the fascinating world of low-valent transition metalates. The first part of the review describes the synthesis and reactivity of d-block metalates stabilized by an assortment of ligand frameworks, including carbonyls, isocyanides, alkenes and polyarenes, phosphines and phosphorus heterocycles, amides, and redox-active nitrogen-based ligands. Thereby, the reader will be familiarized with the impact of different ligand types on the physical and chemical properties of metalates. In addition, ion-pairing interactions and metal-metal bonding may have a dramatic influence on metalate structures and reactivities. The complex ramifications of these effects are examined in a separate section. The second part of the review is devoted to the reactivity of the metalates toward small inorganic molecules such as H2, N2, CO, CO2, P4 and related species. It is shown that the use of highly electron-rich and reactive metalates in small molecule activation translates into impressive catalytic properties in the hydrogenation of organic molecules and the reduction of N2, CO, and CO2. The results discussed in this review illustrate that the potential of transition metalate anions is increasingly being tapped for challenging catalytic processes with relevance to organic synthesis and energy conversion. Therefore, it is hoped that this review will serve as a useful resource to inspire further developments in this dynamic research field.
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Affiliation(s)
| | | | - Robert Wolf
- University of Regensburg, Institute
of Inorganic Chemistry, 93040 Regensburg, Germany
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4
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Singh T, Atreya V, Jalwal S, Anand A, Chakraborty S. Advances in Group VI Metal-Catalyzed Homogeneous Hydrogenation and Dehydrogenation Reactions. Chem Asian J 2023; 18:e202300758. [PMID: 37815164 DOI: 10.1002/asia.202300758] [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: 08/29/2023] [Revised: 10/10/2023] [Accepted: 10/10/2023] [Indexed: 10/11/2023]
Abstract
Transition metal-catalyzed homogeneous hydrogenation and dehydrogenation reactions for attaining plethora of organic scaffolds have evolved as a key domain of research in academia and industry. These protocols are atom-economic, greener, in line with the goal of sustainability, eventually pave the way for numerous novel environmentally benign methodologies. Appealing progress has been achieved in the realm of homogeneous catalysis utilizing noble metals. Owing to their high cost, less abundance along with toxicity issues led the scientific community to search for sustainable alternatives. In this context, earth- abundant base metals have gained substantial attention culminating enormous progress in recent years, predominantly with pincer-type complexes of nickel, cobalt, iron, and manganese. In this regard, group VI chromium, molybdenum and tungsten complexes have been overlooked and remain underdeveloped despite their earth-abundance and bio-compatibility. This review delineates a comprehensive overview in the arena of homogeneously catalysed (de)hydrogenation reactions using group VI base metals chromium, molybdenum, and tungsten till date. Various reactions have been described; hydrogenation, transfer hydrogenation, dehydrogenation, acceptorless dehydrogenative coupling, hydrogen auto transfer, along with their scope and brief mechanistic insights.
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Affiliation(s)
- Tushar Singh
- Department of Chemistry, Indian Institute of Technology Jodhpur, Karwar, Jodhpur, 342037, Rajasthan
| | - Vaishnavi Atreya
- Department of Chemistry, Indian Institute of Technology Jodhpur, Karwar, Jodhpur, 342037, Rajasthan
| | - Sachin Jalwal
- Department of Chemistry, Indian Institute of Technology Jodhpur, Karwar, Jodhpur, 342037, Rajasthan
| | - Aman Anand
- Department of Chemistry, Indian Institute of Technology Jodhpur, Karwar, Jodhpur, 342037, Rajasthan
| | - Subrata Chakraborty
- Department of Chemistry, Indian Institute of Technology Jodhpur, Karwar, Jodhpur, 342037, Rajasthan
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5
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Chromium-catalyzed stereodivergent E- and Z-selective alkyne hydrogenation controlled by cyclic (alkyl)(amino)carbene ligands. Nat Commun 2023; 14:990. [PMID: 36813784 PMCID: PMC9947122 DOI: 10.1038/s41467-023-36677-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 02/13/2023] [Indexed: 02/24/2023] Open
Abstract
The hydrogenation of alkynes allows the synthesis of olefins, which are important feedstock for the materials, pharmaceutical, and petrochemical industry. Thus, methods that enable this transformation via low-cost metal catalysis are desirable. However, achieving stereochemical control in this reaction is a long-standing challenge. Here, we report on the chromium-catalyzed E- and Z-selective olefin synthesis via hydrogenation of alkynes, controlled by two carbene ligands. A cyclic (alkyl)(amino)carbene ligand that contains a phosphino anchor enables the hydrogenation of alkynes in a trans-addition manner, selectively forming E-olefins. With an imino anchor-incorporated carbene ligand, the stereoselectivity can be switched, giving mainly Z-isomers. This ligand-enabled geometrical stereoinversion strategy by one metal catalysis overrides common methods in control of the E- and Z-selectivity with two different metal catalysis, allowing for highly efficient and on-demand access to both E- and Z-olefins in a stereo-complementary fashion. Mechanistic studies indicate that the different steric effect between these two carbene ligands may mainly dominate the selective forming E- or Z-olefins in control of the stereochemistry.
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6
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Li C, Ling L, Luo Z, Wang S, Zhang X, Zeng X. Deoxygenative Cross-Coupling of C(aryl)–O and C(amide)═O Electrophiles Enabled by Chromium Catalysis Using Bipyridine Ligand. ACS Catal 2023. [DOI: 10.1021/acscatal.2c06264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- Chao Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Liang Ling
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Zheng Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Sha Wang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaoyu Zhang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaoming Zeng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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7
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Vielhaber T, Faust K, Bögl T, Schöfberger W, Topf C. A Triphos-Modified Tungsten Piano-Stool Complex for the Homogeneous (Conjugate) Hydrogenation of Ketones and Esters. J Catal 2022. [DOI: 10.1016/j.jcat.2022.11.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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8
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Zn-Catalyzed Regioselective and Chemoselective Reduction of Aldehydes, Ketones and Imines. Int J Mol Sci 2022; 23:ijms232012679. [PMID: 36293541 PMCID: PMC9604354 DOI: 10.3390/ijms232012679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/10/2022] [Accepted: 10/16/2022] [Indexed: 01/24/2023] Open
Abstract
An operationally convenient Zn-catalyzed synthesis of alcohols by the reduction of aldehydes, ketones, and α,β-unsaturated aldehydes/ketones is reported. It is a rare example of using mild and sustainable HBpin as a reductant for catalytic reduction of carbonyl compounds in the absence of acid or base as hydrolysis reagent. The reaction is upscalable and proceeds in high selectivity without the formation of boronate ester by-products, and tolerates sensitive functionalities, such as iodo, bromo, chloro, fluoro, nitro, trifluoromethyl, aminomethyl, alkynyl, and amide. The Zn(OAc)2/HBpin combination has been also proved to be chemoselective for the C=N reduction of imine analogs.
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9
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Wagener T, Pierau M, Heusler A, Glorius F. Synthesis of Saturated N-Heterocycles via a Catalytic Hydrogenation Cascade. Adv Synth Catal 2022; 364:3366-3371. [PMID: 36589139 PMCID: PMC9796080 DOI: 10.1002/adsc.202200601] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Indexed: 01/04/2023]
Abstract
Saturated N-heterocycles are prominent motifs found in various natural products and pharmaceuticals. Despite the increasing interest in this class of compounds, the synthesis of saturated bicyclic azacycles requires tedious multi-step syntheses. Herein, we present a one-pot protocol for the synthesis of octahydroindoles, decahydroquinolines, and octahydroindolizines through a cascade reaction.
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Affiliation(s)
- Tobias Wagener
- Westfälische Wilhelms-Universität MünsterOrganisch-Chemisches InstitutCorrensstraße 4048149MünsterGermany
| | - Marco Pierau
- Westfälische Wilhelms-Universität MünsterOrganisch-Chemisches InstitutCorrensstraße 4048149MünsterGermany
| | - Arne Heusler
- Westfälische Wilhelms-Universität MünsterOrganisch-Chemisches InstitutCorrensstraße 4048149MünsterGermany
| | - Frank Glorius
- Westfälische Wilhelms-Universität MünsterOrganisch-Chemisches InstitutCorrensstraße 4048149MünsterGermany
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10
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Chromium-catalyzed transfer hydrogenation of aromatic aldehydes facilitated by a simple metal carbonyl complex. J Catal 2022. [DOI: 10.1016/j.jcat.2022.07.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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11
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Ding Y, Zhu Z, Chen M, Yu C, Zhou Y. Rhodium‐Catalyzed Asymmetric Hydrogenation of All‐Carbon Aromatic Rings. Angew Chem Int Ed Engl 2022; 61:e202205623. [DOI: 10.1002/anie.202205623] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Indexed: 12/23/2022]
Affiliation(s)
- Yi‐Xuan Ding
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Zhou‐Hao Zhu
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Mu‐Wang Chen
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
| | - Chang‐Bin Yu
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
| | - Yong‐Gui Zhou
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
- Zhang Dayu School of Chemistry Dalian University of Technology Dalian 116023 P. R. China
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12
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Zhou YG, Ding YX, Zhu ZH, Chen MW, Yu CB. Rhodium‐Catalyzed Asymmetric Hydrogenation of All‐Carbon Aromatic Rings. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yong-Gui Zhou
- Dalian Institute of Chemical Physics Department of Fine Chemicals 457 Zhongshan Road 116023 Dalian CHINA
| | - Yi-Xuan Ding
- Dalian Institute of Chemical Physics State Key Laboratory of Catalysis State Key Laboratory of Catalysis CHINA
| | - Zhou-Hao Zhu
- Dalian Institute of Chemical Physics State Key Laboratory of Catalysis State Key Laboratory of Catalysis Dalian CHINA
| | - Mu-Wang Chen
- Dalian Institute of Chemical Physics State Key Laboratory of Catalysis State Key Laboratory of Catalysis Dalian CHINA
| | - Chang-Bin Yu
- Dalian Institute of Chemical Physics State Key Laboratory of Catalysis State Key Laboratory of Catalysis Dalian CHINA
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13
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Han B, Zhang M, Jiao H, Chen R, Ma H, Li R, Wang J, Zhang Y. Regioselective Hydrogenation of Polycyclic Aromatic Hydrocarbons and Olefins Catalyzed by Magnesium‐Activated Chromium Complexes. ChemistrySelect 2022. [DOI: 10.1002/slct.202200776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Bo Han
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Miaomiao Zhang
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Hongmei Jiao
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Rong Chen
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Haojie Ma
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Ran Li
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Jijiang Wang
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Yuqi Zhang
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
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14
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Abstract
Cobalt-NHC complexes have emerged as an attractive class of 3d transition metal catalysts for a broad range of chemical processes, including cross-coupling, hydrogenation, hydrofunctionalization and cycloaddition reactions. Herein, we present a comprehensive review of catalytic methods utilizing cobalt-NHC complexes with a focus on catalyst structure, the role of the NHC ligand, properties of the catalytic system, mechanism and synthetic utility. The survey clearly suggests that the recent emergence of well-defined cobalt-NHC catalysts may have a tremendous utility in the design and application of catalytic reactions using more abundant 3d transition metals.
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Affiliation(s)
- Sourav Sekhar Bera
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
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15
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Fan F, Zhao L, Luo M, Zeng X. Chromium-Catalyzed Selective Cross-Electrophile Coupling between Unactivated C(aryl)–F and C(aryl)–O Bonds. Organometallics 2022. [DOI: 10.1021/acs.organomet.1c00664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fei Fan
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Lixing Zhao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Meiming Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaoming Zeng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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16
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Cobalt-catalyzed cross-coupling of nitrogen-containing heterocyclic phosphonium salts with arylmagnesium reagents. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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17
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Liu YY, Shi XK, Wu CD. Generation of local redox potential from confined nano-bimetals in porous metal silicate materials for high-performance catalysis. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00540a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Confining nano-bimetals in porous metal silicate materials could improve the stabiliy and facilitate electron and charge transfer in catalysis, demonstrating great potential to replace noble metal-based catalysts for industrial applications.
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Affiliation(s)
- Yang-Yang Liu
- State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
| | - Xiao-Ke Shi
- State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
| | - Chuan-De Wu
- State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
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18
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Zhang M, Han B, Ma H, Zhao L, Wang J, Zhang Y. Hydrosilanes as Hydrogen Source: Iridium-Catalyzed Hydrogenation of N-Heteroarenes. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202110041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Visible light enables catalytic formation of weak chemical bonds with molecular hydrogen. Nat Chem 2021; 13:969-976. [PMID: 34253889 DOI: 10.1038/s41557-021-00732-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 05/13/2021] [Indexed: 02/08/2023]
Abstract
The synthesis of weak chemical bonds at or near thermodynamic potential is a fundamental challenge in chemistry, with applications ranging from catalysis to biology to energy science. Proton-coupled electron transfer using molecular hydrogen is an attractive strategy for synthesizing weak element-hydrogen bonds, but the intrinsic thermodynamics presents a challenge for reactivity. Here we describe the direct photocatalytic synthesis of extremely weak element-hydrogen bonds of metal amido and metal imido complexes, as well as organic compounds with bond dissociation free energies as low as 31 kcal mol-1. Key to this approach is the bifunctional behaviour of the chromophoric iridium hydride photocatalyst. Activation of molecular hydrogen occurs in the ground state and the resulting iridium hydride harvests visible light to enable spontaneous formation of weak chemical bonds near thermodynamic potential with no by-products. Photophysical and mechanistic studies corroborate radical-based reaction pathways and highlight the uniqueness of this photodriven approach in promoting new catalytic chemistry.
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20
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Fu A, Zhao L, Li C, Luo M, Zeng X. Chromium-Catalyzed Borylative Coupling of Aliphatic Bromides with Pinacolborane by Hydrogen Evolution. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00171] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Aiping Fu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
| | - Lixing Zhao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
| | - Chao Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
| | - Meiming Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
| | - Xiaoming Zeng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
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21
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Cong X, Zeng X. Mechanistic Diversity of Low-Valent Chromium Catalysis: Cross-Coupling and Hydrofunctionalization. Acc Chem Res 2021; 54:2014-2026. [PMID: 33829759 DOI: 10.1021/acs.accounts.1c00096] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
ConspectusTransition-metal catalysis has traditionally been dominated by precious metals because of their high reactivity toward chemical transformations. As a cost-effective alternative, catalysis by earth-abundant group 6 metal chromium is underdeveloped, and its reactivity remains largely unexplored, although the industrially important Phillips catalyst, which is composed of Cr as the active metal, is currently used to supply almost 40% of the total world demand for high-density polyethylene. Cr has traditionally served in organoreagents with high-valent states (≥2+), which are typified by reactions involving Nozaki-Hiyama-Kishi (NHK) and Takai-Utimoto one-electron transfer processes. Given that low-valent metals usually facilitate the process of oxidative addition (OA), studying the catalysis of Cr in the low-valent state provides the opportunity to develop new transformations. However, probably because of the low stability of reactive low-valent Cr or the lack of catalytic activity of structurally stable complexes, there has been limited success with respect to developing catalysis promoted by low-valent Cr. In recent years, our group has probed the reactivity of low-valent Cr in catalysis by adopting a strategy of forming reactive Cr in situ. In this Account, we detail our efforts to study the catalytic behavior and mechanism of low-valent Cr in challenging transformations, such as the cleavage of chemically inert bonds for the cross-coupling and hydrofunctionalization of arenes and nitro motifs, by developing strategies to address the prominent selectivity issues. We highlight the finding that low-valent Cr, being formed in situ, possesses the intriguing ability to promote the catalytic cleavage of unactivated C-O, C-N, and C-H bonds to achieve the Kumada couplings and even to enable challenging cross-coupling between two unactivated C(aryl)-O/C(aryl)-N bonds. During these catalytic processes, Cr usually adopts a high-spin state to interact with chemicals, allowing for insertion into unactivated σ-bonds. The OA catalytic model involving a two-electron process for the cleavage of unactivated bonds has rarely been considered for Cr. We highlight the finding that Cr allows for the breakage of two chemically inert bonds in one catalytic cycle. This ability is intriguing because most transition metals are suitable only for the cleavage of one unactivated bond in catalysis. Mechanisms involving two-electron OA for Cr are unusual, with processes involving one-electron transfer more often proposed, as exemplified in the NHK reactions. These reactions provide efficient strategies for forming functionalized benzaldehydes, amides, anilines, and amines, usually with high levels of selectivity. We hope that this account will extend the scope of cognition to Cr catalysis.
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Affiliation(s)
- Xuefeng Cong
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, P. R. China
| | - Xiaoming Zeng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, P. R. China
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22
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Zhao L, Hu C, Cong X, Deng G, Liu LL, Luo M, Zeng X. Cyclic (Alkyl)(amino)carbene Ligand-Promoted Nitro Deoxygenative Hydroboration with Chromium Catalysis: Scope, Mechanism, and Applications. J Am Chem Soc 2021; 143:1618-1629. [DOI: 10.1021/jacs.0c12318] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Lixing Zhao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Chenyang Hu
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xuefeng Cong
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Gongda Deng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Liu Leo Liu
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Meiming Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaoming Zeng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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23
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Besora M, Maseras F. Computational insights into metal-catalyzed asymmetric hydrogenation. ADVANCES IN CATALYSIS 2021. [DOI: 10.1016/bs.acat.2021.08.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Han B, Zhang M, Jiao H, Ma H, Wang J, Zhang Y. Ligand-enabled and magnesium-activated hydrogenation with earth-abundant cobalt catalysts. RSC Adv 2021; 11:39934-39939. [PMID: 35494102 PMCID: PMC9044643 DOI: 10.1039/d1ra07266h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 12/09/2021] [Indexed: 11/21/2022] Open
Abstract
Site-selective hydrogenation of PAHs and olefins through a Mg preactivated diketimine/CoBr2 or diketimine–Co complex.
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Affiliation(s)
- Bo Han
- Laboratory of New Energy & New Function Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an, 716000, P. R. China
| | - Miaomiao Zhang
- Laboratory of New Energy & New Function Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an, 716000, P. R. China
| | - Hongmei Jiao
- Laboratory of New Energy & New Function Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an, 716000, P. R. China
| | - Haojie Ma
- Laboratory of New Energy & New Function Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an, 716000, P. R. China
| | - Jijiang Wang
- Laboratory of New Energy & New Function Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an, 716000, P. R. China
| | - Yuqi Zhang
- Laboratory of New Energy & New Function Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an, 716000, P. R. China
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25
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Vinum MG, Voigt L, Hansen SH, Bell C, Clark KM, Larsen RW, Pedersen KS. Ligand field-actuated redox-activity of acetylacetonate. Chem Sci 2020; 11:8267-8272. [PMID: 34094180 PMCID: PMC8163028 DOI: 10.1039/d0sc01836h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 07/15/2020] [Indexed: 11/24/2022] Open
Abstract
The quest for simple ligands that enable multi-electron metal-ligand redox chemistry is driven by a desire to replace noble metals in catalysis and to discover novel chemical reactivity. The vast majority of simple ligand systems display electrochemical potentials impractical for catalytic cycles, illustrating the importance of creating new strategies towards energetically aligned ligand frontier and transition metal d orbitals. We herein demonstrate the ability to chemically control the redox-activity of the ubiquitous acetylacetonate (acac) ligand. By employing the ligand field of high-spin Cr(ii) as a switch, we were able to chemically tailor the occurrence of metal-ligand redox events via simple coordination or decoordination of the labile auxiliary ligands. The mechanism of ligand field actuation can be viewed as a destabilization of the d z 2 orbital relative to the π* LUMO of acac, which proffers a generalizable strategy to synthetically engineer redox-activity with seemingly redox-inactive ligands.
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Affiliation(s)
- Morten Gotthold Vinum
- Department of Chemistry, Technical University of Denmark Kemitorvet Kgs. Lyngby DK-2800 Denmark
| | - Laura Voigt
- Department of Chemistry, Technical University of Denmark Kemitorvet Kgs. Lyngby DK-2800 Denmark
| | - Steen H Hansen
- Department of Chemistry, Technical University of Denmark Kemitorvet Kgs. Lyngby DK-2800 Denmark
| | - Colby Bell
- Department of Chemistry, The University of Memphis Memphis TN USA
| | | | - René Wugt Larsen
- Department of Chemistry, Technical University of Denmark Kemitorvet Kgs. Lyngby DK-2800 Denmark
| | - Kasper S Pedersen
- Department of Chemistry, Technical University of Denmark Kemitorvet Kgs. Lyngby DK-2800 Denmark
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26
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Tang J, Fan F, Cong X, Zhao L, Luo M, Zeng X. Reductive Cross-Coupling between Unactivated C(aryl)–N and C(aryl)–O Bonds by Chromium Catalysis Using a Bipyridyl Ligand. J Am Chem Soc 2020; 142:12834-12840. [DOI: 10.1021/jacs.0c05730] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jinghua Tang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Fei Fan
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xuefeng Cong
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Lixing Zhao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Meiming Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaoming Zeng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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27
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Sheong FK, Zhang JX, Lin Z. Principal interacting spin orbital: understanding the fragment interactions in open-shell systems. Phys Chem Chem Phys 2020; 22:10076-10086. [PMID: 32342069 DOI: 10.1039/d0cp00127a] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Due to the recent rise in the interest and research efforts on first-row transition metal catalysis and other radical-related reactions, open-shell systems play a much more important role in modern chemistry. However, the development of bonding analysis tools for open-shell systems is still lagging behind. In this work, we present the principal interacting spin orbital (PISO) analysis, which is an analysis framework developed based on our previously reported principal interacting orbital (PIO) analysis. We will demonstrate the power of our framework to analyse different kinds of open-shell systems, ranging from simple organic radicals to much more complicated coordination complexes, from which we can see how different kinds of odd-electron bonds could be identified. We will also illustrate its advantage when used in the analysis of chemical reactions, through which we can observe subtle patterns that could be helpful for tuning or rational design of related reactions.
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Affiliation(s)
- Fu Kit Sheong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, People's Republic of China.
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28
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Feng L, Wang T, Jia H, Huang J, Han D, Zhang W, Ding H, Xu Q, Du P, Zhu J. On-surface synthesis of planar acenes via regioselective aryl-aryl coupling. Chem Commun (Camb) 2020; 56:4890-4893. [PMID: 32236253 DOI: 10.1039/d0cc01043j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of 2,2'-dibromo-biphenyl on a Ag(111) surface leads to the formation of planar acenes with a high-regioselectivity rather than nonplanar saddle-shaped tetraphenylene as the typical product in solution chemistry. The regioselective aryl-aryl coupling reaction is attributed to the hydrogen repulsion between the reactants on the confined two-dimensional surface.
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Affiliation(s)
- Lin Feng
- National Synchrotron Radiation Laboratory, Department of Chemical Physics and Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230029, China.
| | - Tao Wang
- National Synchrotron Radiation Laboratory, Department of Chemical Physics and Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230029, China.
| | - Hongxing Jia
- Hefei National Laboratory of Physical Science at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China, 96 Jinzhai Road, Hefei, 230026, P. R. China.
| | - Jianmin Huang
- National Synchrotron Radiation Laboratory, Department of Chemical Physics and Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230029, China.
| | - Dong Han
- National Synchrotron Radiation Laboratory, Department of Chemical Physics and Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230029, China.
| | - Wenzhao Zhang
- National Synchrotron Radiation Laboratory, Department of Chemical Physics and Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230029, China.
| | - Honghe Ding
- National Synchrotron Radiation Laboratory, Department of Chemical Physics and Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230029, China.
| | - Qian Xu
- National Synchrotron Radiation Laboratory, Department of Chemical Physics and Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230029, China.
| | - Pingwu Du
- Hefei National Laboratory of Physical Science at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China, 96 Jinzhai Road, Hefei, 230026, P. R. China.
| | - Junfa Zhu
- National Synchrotron Radiation Laboratory, Department of Chemical Physics and Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230029, China.
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29
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Chen M, Doba T, Sato T, Razumkov H, Ilies L, Shang R, Nakamura E. Chromium(III)-Catalyzed C(sp 2)-H Alkynylation, Allylation, and Naphthalenation of Secondary Amides with Trimethylaluminum as Base. J Am Chem Soc 2020; 142:4883-4891. [PMID: 32068410 DOI: 10.1021/jacs.0c00127] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Among base metals used for C-H activation reactions, chromium(III) is rather unexplored despite its natural abundance and low toxicity. We report herein chromium(III)-catalyzed C(sp2)-H functionalization of an ortho-position of aromatic and α,β-unsaturated secondary amides using readily available AlMe3 as a base and using bromoalkynes, allyl bromide, and 1,4-dihydro-1,4-epoxynaphthalene as electrophiles. This redox-neutral reaction taking place at 70-90 °C, requires as low as 1-2 mol % of CrCl3 or Cr(acac)3 as a catalyst without any added ligand, and tolerates functional groups such as aryl iodide, boronate, and thiophene groups. Stoichiometric and kinetics studies as well as kinetic isotope effects suggest that the catalytic cycle consists of a series of thermally stable but reactive intermediates bearing two molecules of the amide substrate on one chromium atom and also that one of these chromate(III) complexes takes part in the alkynylation, allylation, and naphthalenation reactions. The proposed mechanism accounts for the effective suppression of methyl group delivery from AlMe3 for ortho-C-H methylation.
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Affiliation(s)
- Mengqing Chen
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Takahiro Doba
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Takenari Sato
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hlib Razumkov
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Laurean Ilies
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Rui Shang
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Eiichi Nakamura
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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30
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Vinum MG, Voigt L, Bell C, Mihrin D, Larsen RW, Clark KM, Pedersen KS. Evidence for Non-Innocence of a β-Diketonate Ligand. Chemistry 2020; 26:2143-2147. [PMID: 31721307 DOI: 10.1002/chem.201904899] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Indexed: 11/07/2022]
Abstract
β-Diketonates, such as acetylacetonate, are amongst the most common bidentate ligands towards elements across the entire periodic table and are considered wholly redox-inactive in their complexes. Herein we show that complexation of 1,1,1,5,5,5-hexafluoroacetylacetonate (hfac- ) to CrII spontaneously affords CrIII and a reduced β-diketonate radical ligand scaffold, as evidenced by crystallographic analysis, magnetic measurements, optical spectroscopy, reactivity studies, and DFT calculations. The possibility of harnessing β-diketonates as electron reservoirs opens up possibilities for new metal-ligand concerted reactivity in the ubiquitous β-diketonate coordination chemistry.
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Affiliation(s)
- Morten Gotthold Vinum
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark
| | - Laura Voigt
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark
| | - Colby Bell
- Department of Chemistry, The University of Memphis, Memphis, TN, USA
| | - Dmytro Mihrin
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark
| | - René Wugt Larsen
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark
| | | | - Kasper S Pedersen
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark
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31
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Vasanthakumar P, Sindhuja D, Senthil Raja D, Lin CH, Karvembu R. Iron and chromium MOFs as sustainable catalysts for transfer hydrogenation of carbonyl compounds and biomass conversions. NEW J CHEM 2020. [DOI: 10.1039/d0nj00552e] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Fe and Cr based MOFs (MIL-88B) act as efficient and reusable catalysts for transfer hydrogenation of carbonyl compounds including bio-derived substrates.
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Affiliation(s)
| | | | | | - Chia-Her Lin
- Department of Chemistry
- Chung Yuan Christian University
- Chung Li
- Taoyuan 32023
- Taiwan
| | - Ramasamy Karvembu
- Department of Chemistry
- National Institute of Technology
- Tiruchirappalli 620015
- India
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32
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Rong Z, Luo M, Zeng X. Modular Arene Difunctionalization of Unactivated C-O and C-H Bonds by Sequential Chromium-Catalyzed Transformations. Org Lett 2019; 21:6869-6873. [PMID: 31453706 DOI: 10.1021/acs.orglett.9b02504] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sequential transformations of unactivated C-O and C-H bonds under chromium catalysis are described. The use of a N-benzyl-substituted imino group as an auxiliary combined with chromium(II) chloride as a precatalyst and 2,3-dichlorobutane as an oxidant allows the arene C-O and C-H bonds to sequentially couple to arylmagnesium reagents to incorporate two identical or different aryl groups into the ortho positions of benzaldehydes.
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Affiliation(s)
- Zhi Rong
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Meiming Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaoming Zeng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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