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Wirtz L, Ghulam KY, Morgenstern B, Schäfer A. Constrained Geometry
ansa
‐Half‐Sandwich Complexes of Magnesium – Versatile
s
‐Block Catalysts. ChemCatChem 2022. [DOI: 10.1002/cctc.202201007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Lisa Wirtz
- Faculty of Natural Science and Technology Department of Chemistry Saarland University Campus Saarbrücken 66123 Saarbrücken Germany
| | - Kinza Yasmin Ghulam
- Faculty of Natural Science and Technology Department of Chemistry Saarland University Campus Saarbrücken 66123 Saarbrücken Germany
| | - Bernd Morgenstern
- Faculty of Natural Science and Technology Department of Chemistry Saarland University Campus Saarbrücken 66123 Saarbrücken Germany
| | - André Schäfer
- Faculty of Natural Science and Technology Department of Chemistry Saarland University Campus Saarbrücken 66123 Saarbrücken Germany
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2
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Chapple P, Roisnel T, Cordier M, Carpentier JF, Sarazin Y. Heteroleptic Carbazolato-Barium Hydroborates and a Related Separated Ion Pair. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Maji S, Das A, Mandal SK. Mesoionic N-heterocyclic olefin catalysed reductive functionalization of CO 2 for consecutive N-methylation of amines. Chem Sci 2021; 12:12174-12180. [PMID: 34667583 PMCID: PMC8457391 DOI: 10.1039/d1sc02819g] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 08/02/2021] [Indexed: 11/21/2022] Open
Abstract
A mesoionic N-heterocyclic olefin (mNHO) was introduced as a metal-free catalyst for the reductive functionalization of CO2 leading to consecutive double N-methylation of primary amines in the presence of 9-borabicyclo[3.3.1]nonane (9-BBN). A wide range of secondary amines and primary amines were successfully methylated under mild conditions. The catalyst sustained over six successive cycles of N-methylation of secondary amines without compromising its activity, which encouraged us to check its efficacy towards double N-methylation of primary amines. Moreover, this method was utilized for the synthesis of two commercially available drug molecules. A detailed mechanistic cycle was proposed by performing a series of control reactions along with the successful characterisation of active catalytic intermediates either by single-crystal X-ray study or by NMR spectroscopic studies in association with DFT calculations.
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Affiliation(s)
- Subir Maji
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata Mohanpur-741246 India
| | - Arpan Das
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata Mohanpur-741246 India
| | - Swadhin K Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata Mohanpur-741246 India
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4
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Le Coz E, Hammoud J, Roisnel T, Cordier M, Dorcet V, Kahlal S, Carpentier JF, Saillard JY, Sarazin Y. Bonding in Barium Boryloxides, Siloxides, Phenoxides and Silazides: A Comparison with the Lighter Alkaline Earths. Chemistry 2021; 27:11966-11982. [PMID: 34121256 DOI: 10.1002/chem.202101687] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Indexed: 11/11/2022]
Abstract
Barium complexes ligated by bulky boryloxides [OBR2 ]- (where R=CH(SiMe3 )2 , 2,4,6-i Pr3 -C6 H2 or 2,4,6-(CF3 )3 -C6 H2 ), siloxide [OSi(SiMe3 )3 ]- , and/or phenoxide [O-2,6-Ph2 -C6 H3 ]- , have been prepared. A diversity of coordination patterns is observed in the solid state for both homoleptic and heteroleptic complexes, with coordination numbers ranging between 2 and 4. The identity of the bridging ligand in heteroleptic dimers [Ba(μ2 -X1 )(X2 )]2 depends largely on the given pair of ligands X1 and X2 . Experimentally, the propensity to fill the bridging position increases according to [OB{CH(SiMe3 )2 }2 )]- <[N(SiMe3 )2 ]- <[OSi(SiMe3 )3 ]- <[O(2,6-Ph2 -C6 H3 )]- <[OB(2,4,6-i Pr3 -C6 H2 )2 ]- . This trend is the overall expression of 3 properties: steric constraints, electronic density and σ- and π-donating capability of the negatively charged atom, and ability to generate Ba ⋅ ⋅ ⋅ F, Ba ⋅ ⋅ ⋅ C(π) or Ba ⋅ ⋅ ⋅ H-C secondary interactions. The comparison of the structural motifs in the complexes [Ae{μ2 -N(SiMe3 )2 }(OB{CH(SiMe3 )2 }2 )]2 (Ae = Mg, Ca, Sr and Ba) suggest that these observations may be extended to all alkaline earths. DFT calculations highlight the largely prevailing ionic character of ligand-Ae bonding in all compounds. The ionic character of the Ae-ligand bond encourages bridging coordination, whereas the number of bridging ligands is controlled by steric factors. DFT computations also indicate that in [Ba(μ2 -X1 )(X2 )]2 heteroleptic dimers, ligand predilection for bridging vs. terminal positions is dictated by the ability to establish secondary interactions between the metals and the ligands.
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Affiliation(s)
- Erwann Le Coz
- Univ Rennes, CNRS ISCR, Institut des Sciences Chimiques de Rennes)-UMR 6226, 35000, Rennes, France
| | - Joanna Hammoud
- Univ Rennes, CNRS ISCR, Institut des Sciences Chimiques de Rennes)-UMR 6226, 35000, Rennes, France
| | - Thierry Roisnel
- Univ Rennes, CNRS ISCR, Institut des Sciences Chimiques de Rennes)-UMR 6226, 35000, Rennes, France
| | - Marie Cordier
- Univ Rennes, CNRS ISCR, Institut des Sciences Chimiques de Rennes)-UMR 6226, 35000, Rennes, France
| | - Vincent Dorcet
- Univ Rennes, CNRS ISCR, Institut des Sciences Chimiques de Rennes)-UMR 6226, 35000, Rennes, France
| | - Samia Kahlal
- Univ Rennes, CNRS ISCR, Institut des Sciences Chimiques de Rennes)-UMR 6226, 35000, Rennes, France
| | - Jean-François Carpentier
- Univ Rennes, CNRS ISCR, Institut des Sciences Chimiques de Rennes)-UMR 6226, 35000, Rennes, France
| | - Jean-Yves Saillard
- Univ Rennes, CNRS ISCR, Institut des Sciences Chimiques de Rennes)-UMR 6226, 35000, Rennes, France
| | - Yann Sarazin
- Univ Rennes, CNRS ISCR, Institut des Sciences Chimiques de Rennes)-UMR 6226, 35000, Rennes, France
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5
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Caise A, Kolychev EL, Hicks J, Fuentes MÁ, Goicoechea JM, Aldridge S. Reversible borohydride formation from aluminium hydrides and {H(9-BBN)} 2: structural, thermodynamic and reactivity studies. Dalton Trans 2019; 48:10845-10852. [PMID: 30848267 DOI: 10.1039/c9dt00535h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A series of novel β-diketiminate stabilised aluminium borohydrides of the type (Nacnac)Al(R){H2(9-BBN)} has been synthesised offering variation in both the auxiliary R substituent and in the Nacnac backbone itself. A number of these complexes show unusual dissociation of the borane from the aluminium hydride in solution under ambient conditions. The lability of the borane is shown (by variable temperature NMR analyses) to be influenced by the electronic character of both the aluminium-bound R substituent and the Nacnac ligand itself, such that electron-withdrawing substituents lead to greater dissociation of the borane. Comparison of these complexes with related systems featuring the tetrahydroborate [BH4]- ligand illustrates the impact of the boron-bound substituents on the ability of the borane fragment to dissociate from the aluminium hydride. This dissociative behaviour is shown to be highly influential on the ability of the borohydride complexes to reduce carbon dioxide in a stoichiometric manner.
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Affiliation(s)
- Alexa Caise
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
| | - Eugene L Kolychev
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
| | - Jamie Hicks
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
| | - M Ángeles Fuentes
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
| | - Jose M Goicoechea
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
| | - Simon Aldridge
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
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6
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Li Y, Wu M, Chen H, Xu D, Qu L, Zhang J, Bai R, Lan Y. Role of Alkaline-Earth Metal-Catalyst: A Theoretical Study of Pyridines Hydroboration. Front Chem 2019; 7:149. [PMID: 30972320 PMCID: PMC6443636 DOI: 10.3389/fchem.2019.00149] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Accepted: 02/28/2019] [Indexed: 01/06/2023] Open
Abstract
Density functional theory (DFT) calculations have been performed to investigate the mechanism of alkaline-earth-metal-catalyzed hydroboration of pyridines with borane. In this reaction, the active catalytic species is considered to be an alkaline earth metal hydride complex when the corresponding alkaline earth metal is used as the catalyst. The theoretical results reveal that initiation of the catalytic cycle is hydride transfer to generate a magnesium hydride complex when β-diimine alkylmagnesium is used as a pre-catalyst. The magnesium hydride complex can undergo coordination of the pyridine reactant followed by hydride transfer to form a dearomatized magnesium pyridine intermediate. Coordination of borane and hydride transfer from borohydride to magnesium then give the hydroboration product and regenerate the active magnesium hydride catalyst. The rate-determining step of the catalytic cycle is hydride transfer to pyridine with a free energy barrier of 29.7 kcal/mol. Other alkaline earth metal complexes, including calcium and strontium complexes, were also considered. The DFT calculations show that the corresponding activation free energies for the rate-determining step of this reaction with calcium and strontium catalysts are much lower than with the magnesium catalyst. Therefore, calcium and strontium complexes can be used as the catalyst for the reaction, which could allow mild reaction conditions.
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Affiliation(s)
- Yuanyuan Li
- Department of Biological and Chemical Engineering, Chongqing University of Education, Chongqing, China.,Cooperative Innovation Center of Lipid Resources and Children's Daily Chemicals, Chongqing University of Education, Chongqing, China.,College of Chemistry and Molecular Engineering, ZhengZhou University, ZhengZhou, China
| | - Meijun Wu
- Department of Biological and Chemical Engineering, Chongqing University of Education, Chongqing, China
| | - Haohua Chen
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, China
| | - Dongdong Xu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, China
| | - Lingbo Qu
- College of Chemistry and Molecular Engineering, ZhengZhou University, ZhengZhou, China
| | - Jing Zhang
- Department of Chemistry and Chemical Engineering, Jining University, Jining, China
| | - Ruopeng Bai
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, China
| | - Yu Lan
- College of Chemistry and Molecular Engineering, ZhengZhou University, ZhengZhou, China.,School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, China
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7
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Yu L, Qian R, Deng X, Wang F, Xu Q. Calcium-catalyzed reactions of element-H bonds. Sci Bull (Beijing) 2018; 63:1010-1016. [PMID: 36658887 DOI: 10.1016/j.scib.2018.06.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/27/2018] [Accepted: 05/28/2018] [Indexed: 01/21/2023]
Abstract
Investigation on organocalcium catalysis is just unfolding during the past decade. Beside conventional Ca salts with strong electron-withdrawing counter anions that may serve as Lewis acid catalysts, many Ca complexes have also been designed recently and found to be good catalysts in activation of element-H (EH) bonds like transition metal catalysts. These findings are interesting and may attract the interest of the chemists. Due to the great abundance, non-toxicity, and biocompatible features of Ca element, Ca-catalyzed reactions can be of great significance from the viewpoint of industry. This short review summarizes the recent advances on Ca-catalyzed reactions of EH bonds. We hope that it may provide a useful guide for interested readers from both the academy and industry.
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Affiliation(s)
- Lei Yu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | | | - Xin Deng
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Fang Wang
- Yangzhou Polytechnology Institute, Yangzhou 225127, China
| | - Qing Xu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
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8
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Mellino S, Stevenson LC, Clot E, Mountford P. Reactions of Titanium Imides and Hydrazides with Boranes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00477] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Simona Mellino
- Chemistry
Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Laura C. Stevenson
- Chemistry
Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Eric Clot
- Institut
Charles Gerhardt Montpellier, UMR 5253 CNRS-UM-ENSCM, Université de Montpellier, cc 1501, Place Eugéne Bataillon, F-34095 Montpellier Cedex 5, France
| | - Philip Mountford
- Chemistry
Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
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9
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Miao H, Wang S, Zhu X, Zhou S, Wei Y, Yuan Q, Mu X. Synthesis, characterization and catalytic activity of rare-earth metal amides incorporating cyclohexyl bridged bis(β-diketiminato) ligands. RSC Adv 2017. [DOI: 10.1039/c7ra07565k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The bridged bis(β-diketiminato) ligands supported rare-earth amides exhibited high catalytic activity towards the hydrophosphination of β-nitroalkene and α,β-unsaturated carbonyl derivatives with an excellent regioselectivity.
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Affiliation(s)
- Hui Miao
- Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Shaowu Wang
- Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Xiancui Zhu
- Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Shuangliu Zhou
- Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Yun Wei
- Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Qingbing Yuan
- Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Xiaolong Mu
- Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- College of Chemistry and Materials Science
- Anhui Normal University
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10
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Xu D, Shan C, Li Y, Qi X, Luo X, Bai R, Lan Y. Bond dissociation energy controlled σ-bond metathesis in alkaline-earth-metal hydride catalyzed dehydrocoupling of amines and boranes: a theoretical study. Inorg Chem Front 2017. [DOI: 10.1039/c7qi00459a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alkaline-earth-metal could catalyse the dehydrocoupling procedure of N–H and B–H bond due to the low Ae–H bond energy. The direct σ-bond metathesis procedure is proved to be unfavourable.
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Affiliation(s)
- Dongdong Xu
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| | - Chunhui Shan
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| | - Yingzi Li
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| | - Xiaotian Qi
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| | - Xiaoling Luo
- College of Chemistry
- Chongqing Normal University
- Chongqing 401331
- P. R. China
| | - Ruopeng Bai
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| | - Yu Lan
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
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11
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Sarazin Y, Carpentier JF. Calcium, Strontium and Barium Homogeneous Catalysts for Fine Chemicals Synthesis. CHEM REC 2016; 16:2482-2505. [PMID: 27353504 DOI: 10.1002/tcr.201600067] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Indexed: 01/22/2023]
Abstract
The large alkaline earths (Ae), calcium, strontium and barium, have in the past 15 years yielded a brand new generation of heteroleptic molecular catalysts for the production of fine chemicals. However, the integrity of these complexes is often plagued by ligand redistribution equilibria in solution. This personal account retraces the paths followed in our research group towards the design of stable heteroleptic alkalino-earth complexes, including the use of intramolecular noncovalent Ae···H-Si and Ae···F-C interactions. Their implementation as homogenous precatalysts for reactions such as the intramolecular and intermolecular hydroamination and hydrophosphination of activated alkenes, the hydrophosphonylation of ketones, and the dehydrogenative coupling of amines and hydrosilanes that enable the efficient and controlled formations of CP, CN, or SiN σ-bonds, is presented in a synthetic perspective that highlights their overall outstanding catalytic performance.
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Affiliation(s)
- Yann Sarazin
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques de Rennes UMR 6226 CNRS - Université de Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France
| | - Jean-François Carpentier
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques de Rennes UMR 6226 CNRS - Université de Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France
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12
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Hill MS, Liptrot DJ, Weetman C. Alkaline earths as main group reagents in molecular catalysis. Chem Soc Rev 2016; 45:972-88. [PMID: 26797470 DOI: 10.1039/c5cs00880h] [Citation(s) in RCA: 356] [Impact Index Per Article: 44.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The past decade has witnessed some remarkable advances in our appreciation of the structural and reaction chemistry of the heavier alkaline earth (Ae = Mg, Ca, Sr, Ba) elements. Derived from complexes of these metals in their immutable +2 oxidation state, a broad and widely applicable catalytic chemistry has also emerged, driven by considerations of cost and inherent low toxicity. The considerable adjustments incurred to ionic radius and resultant cation charge density also provide reactivity with significant mechanistic and kinetic variability as group 2 is descended. In an attempt to place these advances in the broader context of contemporary main group element chemistry, this review focusses on the developing state of the art in both multiple bond heterofunctionalisation and cross coupling catalysis. We review specific advances in alkene and alkyne hydroamination and hydrophosphination catalysis and related extensions of this reactivity that allow the synthesis of a wide variety of acyclic and heterocyclic small molecules. The use of heavier alkaline earth hydride derivatives as pre-catalysts and intermediates in multiple bond hydrogenation, hydrosilylation and hydroboration is also described along with the emergence of these and related reagents in a variety of dehydrocoupling processes that allow that facile catalytic construction of Si-C, Si-N and B-N bonds.
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Affiliation(s)
- Michael S Hill
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
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13
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Melen RL. Dehydrocoupling routes to element–element bonds catalysed by main group compounds. Chem Soc Rev 2016; 45:775-88. [DOI: 10.1039/c5cs00521c] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This Tutorial Review focuses on recent applications of main group compounds in the catalytic synthesis of heteronuclear element–element bonds within the p-block.
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14
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Camp C, Arnold J. On the non-innocence of “Nacnacs”: ligand-based reactivity in β-diketiminate supported coordination compounds. Dalton Trans 2016; 45:14462-98. [DOI: 10.1039/c6dt02013e] [Citation(s) in RCA: 133] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
While β-diketiminate (BDI or ‘nacnac’) ligands have been widely adopted to stabilize a wide range of metal ions in multiple oxidation states and coordination numbers, in several occurrences these ligands do not behave as spectators and participate in reactivity.
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Affiliation(s)
- Clément Camp
- Univ Lyon
- CNRS, ESCPE Lyon
- Université Claude Bernard Lyon 1
- C2P2 UMR 5265
- F-69616 Villeurbanne
| | - John Arnold
- Department of Chemistry
- University of California
- Berkeley
- USA
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15
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Harinath A, Anga S, Panda TK. Alkali metal catalyzed dehydro-coupling of boranes and amines leading to the formation of a B–N bond. RSC Adv 2016. [DOI: 10.1039/c6ra04125f] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
N–H/H–B cross-dehydrogenative coupling (CDC) of boranes and amines with high conversion (>90%) and chemo-selectivity using group-1 metal salts as pre-catalysts, and under ambient conditions is presented.
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Affiliation(s)
- A. Harinath
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy 502285
- India
| | - Srinivas Anga
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy 502285
- India
| | - Tarun K. Panda
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy 502285
- India
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16
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Liptrot DJ, Hill MS, Mahon MF, Wilson ASS. Alkaline-Earth-Catalyzed Dehydrocoupling of Amines and Boranes. Angew Chem Int Ed Engl 2015; 54:13362-5. [PMID: 26360523 PMCID: PMC4674969 DOI: 10.1002/anie.201505949] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 08/13/2015] [Indexed: 11/28/2022]
Abstract
Dehydrocoupling reactions between the boranes HBpin and 9-borabicyclo[3.3.1]nonane and a range of amines and anilines ensue under very mild reaction conditions in the presence of a simple β-diketiminato magnesium n-butyl precatalyst. The facility of the reactions is suggested to be a function of the Lewis acidity of the borane substrate, and is dictated by resultant pre-equilibria between, and the relative stability of, magnesium hydride and borohydride intermediates during the course of the catalysis.
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Affiliation(s)
- David J Liptrot
- Department of Chemistry, University of Bath, Bath BA2 7AY (UK)
| | - Michael S Hill
- Department of Chemistry, University of Bath, Bath BA2 7AY (UK).
| | - Mary F Mahon
- Department of Chemistry, University of Bath, Bath BA2 7AY (UK)
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17
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Liptrot DJ, Hill MS, Mahon MF, Wilson ASS. Alkaline‐Earth‐Catalyzed Dehydrocoupling of Amines and Boranes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505949] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Michael S. Hill
- Department of Chemistry, University of Bath, Bath BA2 7AY (UK)
| | - Mary F. Mahon
- Department of Chemistry, University of Bath, Bath BA2 7AY (UK)
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18
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Stevenson LC, Mellino S, Clot E, Mountford P. Reactions of Titanium Hydrazides with Silanes and Boranes: N-N Bond Cleavage and N Atom Functionalization. J Am Chem Soc 2015; 137:10140-3. [PMID: 26226513 DOI: 10.1021/jacs.5b06627] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reaction of Ti(N2(iPr)N)(NNPh2)(py) with Ph(R)SiH2 (R = H, Ph) or 9-BBN gave reductive cleavage of the N(α)-N(β) bond and formation of new silyl- or boryl-amido ligands. The corresponding reactions of Cp*Ti{MeC(N(i)Pr)2}(NNR2) (R = Me or Ph) with HBPin or 9-BBN gave borylhydrazido-hydride or borylimido products, respectively. N(α) and N(β) atom transfer and dehydrogenative coupling reactions are also reported.
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Affiliation(s)
- Laura C Stevenson
- †Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Simona Mellino
- †Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Eric Clot
- ‡Institut Charles Gerhardt Montpellier, CNRS 5253, Université Montpellier, cc 1501, Place Eugène Bataillon, F-34095 Montpellier Cedex 5, France
| | - Philip Mountford
- †Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
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Liptrot DJ, Hill MS, Mahon MF. Heterobimetallic s-Block Hydrides by σ-Bond Metathesis. Chemistry 2014; 20:9871-4. [DOI: 10.1002/chem.201403215] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Indexed: 11/10/2022]
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20
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Liptrot DJ, Hill PMS, Mahon MF. Accessing the Single-Electron Manifold: Magnesium-mediated Hydrogen Release from Silanes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403208] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Liptrot DJ, Hill PMS, Mahon MF. Accessing the Single-Electron Manifold: Magnesium-mediated Hydrogen Release from Silanes. Angew Chem Int Ed Engl 2014; 53:6224-7. [DOI: 10.1002/anie.201403208] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Indexed: 11/09/2022]
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22
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23
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24
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Arrowsmith M, Crimmin MR, Hill MS, Kociok-Köhn G. Beryllium derivatives of a phenyl-substituted β-diketiminate: a well-defined ring opening reaction of tetrahydrofuran. Dalton Trans 2013; 42:9720-6. [PMID: 23685744 DOI: 10.1039/c3dt51021b] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Merle Arrowsmith
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
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Arrowsmith M, Hill MS, Kociok-Köhn G, MacDougall DJ, Mahon MF, Mallov I. Three-Coordinate Beryllium β-Diketiminates: Synthesis and Reduction Chemistry. Inorg Chem 2012; 51:13408-18. [DOI: 10.1021/ic3022968] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Merle Arrowsmith
- Department of Chemistry, University of Bath, Claverton Down,
Bath BA2 7AY, U.K
| | - Michael S. Hill
- Department of Chemistry, University of Bath, Claverton Down,
Bath BA2 7AY, U.K
| | | | | | - Mary F. Mahon
- Department of Chemistry, University of Bath, Claverton Down,
Bath BA2 7AY, U.K
| | - Ian Mallov
- Department of Chemistry, University of Bath, Claverton Down,
Bath BA2 7AY, U.K
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26
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Chakraborty S, Zhang J, Patel YJ, Krause JA, Guan H. Pincer-Ligated Nickel Hydridoborate Complexes: the Dormant Species in Catalytic Reduction of Carbon Dioxide with Boranes. Inorg Chem 2012; 52:37-47. [DOI: 10.1021/ic300587b] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sumit Chakraborty
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati,
Ohio 45221-0172, United States
| | - Jie Zhang
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati,
Ohio 45221-0172, United States
| | - Yogi J. Patel
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati,
Ohio 45221-0172, United States
| | - Jeanette A. Krause
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati,
Ohio 45221-0172, United States
| | - Hairong Guan
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati,
Ohio 45221-0172, United States
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27
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Harder S, Spielmann J. Calcium-mediated hydroboration of alkenes: “Trojan horse” or “true” catalysis? J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2011.09.025] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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28
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Less RJ, Melen RL, Wright DS. Catalytic versus stoichiometric dehydrocoupling using main group metals. RSC Adv 2012. [DOI: 10.1039/c2ra00882c] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Krieck S, Görls H, Westerhausen M. Synthesis and characterization of rare examples of stable potassium and arylcalcium triethylboranate complexes. INORG CHEM COMMUN 2010. [DOI: 10.1016/j.inoche.2010.08.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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31
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Pillai Sarish S, Jana A, Roesky HW, Schulz T, John M, Stalke D. Heavier Alkaline Earth Metal Borohydride Complexes Stabilized by β−Diketiminate Ligand. Inorg Chem 2010; 49:3816-20. [DOI: 10.1021/ic902338r] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Anukul Jana
- 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
| | - Thomas Schulz
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Michael John
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Dietmar Stalke
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
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32
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Crimmin MR, Hill MS, Hitchcock PB, Mahon MF. Synthesis of β-diketiminato calcium silylamides and their reactions with triethylaluminium. NEW J CHEM 2010. [DOI: 10.1039/c0nj00042f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Coles MP, Sözerli SE, Smith JD, Hitchcock PB, Day IJ. An Ether-Free, Internally Coordinated Dialkylcalcium(II) Complex. Organometallics 2009. [DOI: 10.1021/om8011618] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Martyn P. Coles
- Departments of Chemistry, University of Sussex, Brighton BN1 9QJ, U.K., and Celal Bayar University, Manisa, Turkey 45030
| | - Sebnem E. Sözerli
- Departments of Chemistry, University of Sussex, Brighton BN1 9QJ, U.K., and Celal Bayar University, Manisa, Turkey 45030
| | - J. David Smith
- Departments of Chemistry, University of Sussex, Brighton BN1 9QJ, U.K., and Celal Bayar University, Manisa, Turkey 45030
| | - Peter B. Hitchcock
- Departments of Chemistry, University of Sussex, Brighton BN1 9QJ, U.K., and Celal Bayar University, Manisa, Turkey 45030
| | - Iain J. Day
- Departments of Chemistry, University of Sussex, Brighton BN1 9QJ, U.K., and Celal Bayar University, Manisa, Turkey 45030
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Orzechowski L, Jansen G, Lutz M, Harder S. Calcium carbene complexes with boranophosphorano side-arms: CaC[P(Ph)2BH3]2. Dalton Trans 2009:2958-64. [DOI: 10.1039/b823224e] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Barrett AGM, Crimmin MR, Hill MS, Hitchcock PB, Procopiou PA. Insertion reactions of β-diketiminate-stabilised calcium amides with 1,3-dialkylcarbodiimides. Dalton Trans 2008:4474-81. [DOI: 10.1039/b717383k] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Barrett AGM, Crimmin MR, Hill MS, Kociok-Köhn G, Lachs JR, Procopiou PA. Reversibility in the protonolysis of a β-diketiminate stabilised calcium bis(trimethylsilyl)amide with benzylamine. Dalton Trans 2008:1292-4. [DOI: 10.1039/b717402k] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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