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Pearce KG, Neale SE, McMullin CL, Mahon MF, Hill MS. Pathway to a molecular calcium methyl. Chem Commun (Camb) 2024; 60:7882-7885. [PMID: 38973507 DOI: 10.1039/d4cc02930e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/09/2024]
Abstract
The dimeric β-diketiminato calcium hydride, [(BDI)CaH]2 (BDI = HC{(Me)CN-2,6-iPr2C6H3}2), reacts with ZnMe2 to afford the bimetallic calcium zincate complex, [(BDI)Ca(μ-CH3)2Zn(μ-H)]2, which subsequently undergoes an intramolecular reaction to effect the formation of [(BDI)CaMe]2, a notable omission from the homologous series of β-diketiminato alkylcalcium derivatives.
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Affiliation(s)
- Kyle G Pearce
- Department of Chemistry, University of Bath, Claverton Down, Bath, UK.
| | - Samuel E Neale
- Department of Chemistry, University of Bath, Claverton Down, Bath, UK.
| | - Claire L McMullin
- Department of Chemistry, University of Bath, Claverton Down, Bath, UK.
| | - Mary F Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath, UK.
| | - Michael S Hill
- Department of Chemistry, University of Bath, Claverton Down, Bath, UK.
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2
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Pearce KG, Dinoi C, Schwamm RJ, Maron L, Mahon MF, Hill MS. Variable Ca-C aryl Hapticity and its Consequences in Arylcalcium Dimers. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2304765. [PMID: 37715248 PMCID: PMC10625118 DOI: 10.1002/advs.202304765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 08/11/2023] [Indexed: 09/17/2023]
Abstract
The dimeric β-diketiminato calcium hydride, [(Dipp BDI)CaH]2 (Dipp BDI = HC{(Me)CN-2,6-i-Pr2 C6 H3 }2 ), reacts with ortho-, meta- or para-tolyl mercuric compounds to afford hydridoarylcalcium compounds, [(Dipp BDI)2 Ca2 (μ-H)(μ-o-,m-,p-tolyl)], in which dimer propagation occurs either via μ2 -η1 -η1 or μ2 -η1 -η6 bridging between the calcium centers. In each case, the orientation and hapticity of the aryl units is dependent upon the position of the methyl substituent. While wholly organometallic meta- and para-tolyl dimers, [(Dipp BDI)Ca(m-tolyl)]2 and [(Dipp BDI)Ca(p-tolyl)]2 , can be prepared and are stable, the ortho-tolyl isomer is prone to isomerization to a calcium benzyl analog. Computational analysis of this latter process with density functional theory (DFT) highlights an unusual mechanism invoking the generation of an intermediate dicalcium species in which the group 2 centers are bridged by a toluene dianion formed by the formal attachment of the original hydride anion to the initially generated ortho-tolyl substituent. Use of a more sterically encumbered aryl substituent, {3,5-t-Bu2 C6 H3 }, facilitates the selective formation of [(Dipp BDI)Ca(μ-H)(μ-3,5-t-Bu2 C6 H3 )Ca(Dipp BDI)], which can be converted into the unsymmetrically-substituted σ-aryl calcium complexes, [(Dipp BDI)Ca(μ-Ph)(μ-3,5-t-Bu2 C6 H3 )Ca(Dipp BDI)] and [(Dipp BDI)Ca(μ-p-tolyl)(μ-3,5-t-Bu2 C6 H3 )Ca(Dipp BDI)] by reaction with the appropriate mercuric diaryl. Conversion of [(Dipp BDI)Ca(H)(Ph)Ca(Dipp BDI)] to afford [{{(Dipp BDI)Ca}2 (μ2 -Cl)}2 (C6 H5 -C6 H5 )], comprising a biphenyl dianion, is also reported. Although this latter transformation is serendipitous, AIM analysis highlights that, in a related manner to the ortho-tolyl to benzyl isomerization, the requisite C-C coupling may be facilitated in an "across dimer" fashion by the experimentally-observed polyhapto engagement of the aryl substituents with each calcium.
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Affiliation(s)
- Kyle G. Pearce
- Department of ChemistryUniversity of BathClaverton DownBathBA2 7AYUK
| | - Chiara Dinoi
- Université de Toulouse et CNRSINSAUPSUMR 5215LPCNO135 Avenue de RangueilToulouseF‐31077France
| | - Ryan J. Schwamm
- Department of ChemistryUniversity of BathClaverton DownBathBA2 7AYUK
| | - Laurent Maron
- Université de Toulouse et CNRSINSAUPSUMR 5215LPCNO135 Avenue de RangueilToulouseF‐31077France
| | - Mary F. Mahon
- Department of ChemistryUniversity of BathClaverton DownBathBA2 7AYUK
| | - Michael S. Hill
- Department of ChemistryUniversity of BathClaverton DownBathBA2 7AYUK
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Pearce KG, Dinoi C, Hill MS, Mahon MF, Maron L, Schwamm RS, Wilson ASS. Synthesis of Molecular Phenylcalcium Derivatives: Application to the Formation of Biaryls. Angew Chem Int Ed Engl 2022; 61:e202200305. [PMID: 35212128 PMCID: PMC9315018 DOI: 10.1002/anie.202200305] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Indexed: 12/17/2022]
Abstract
Hydrocarbon-soluble β-diketiminato phenylcalcium derivatives, which display various modes of Ca-μ2 -Ph-Ca bridging, are accessible from reactions of Ph2 Hg and [(BDI)CaH]2 . Although the resultant compounds are inert toward the C-H bonds of benzene, they yield selective and uncatalyzed biaryl formation when reacted with readily available aryl bromides.
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Affiliation(s)
- Kyle G. Pearce
- Department of ChemistryUniversity of BathClaverton Down, BathUK
| | - Chiara Dinoi
- Université de Toulouse et CNRSINSAUPSUMR 5215LPCNO135 Avenue de Rangueil31077ToulouseFrance
| | - Michael S. Hill
- Department of ChemistryUniversity of BathClaverton Down, BathUK
| | - Mary F. Mahon
- Department of ChemistryUniversity of BathClaverton Down, BathUK
| | - Laurent Maron
- Université de Toulouse et CNRSINSAUPSUMR 5215LPCNO135 Avenue de Rangueil31077ToulouseFrance
| | - Ryan S. Schwamm
- Department of ChemistryUniversity of BathClaverton Down, BathUK
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Hill MS, Pearce KG, Dinoi C, Mahon MF, Maron L, Schwamm RS, Wilson ASS. Synthesis of Molecular Phenylcalcium Derivatives: Application to the Formation of Biaryls. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200305] [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)
- Michael Stephen Hill
- University of Bath Chemistry Department of ChemistryUniversity of BathClaverton Down BA2 7AY Bath UNITED KINGDOM
| | | | - Chiara Dinoi
- Toulouse 3 University: Universite Toulouse III Paul Sabatier Chemistry FRANCE
| | | | - Laurent Maron
- Toulouse 3 University: Universite Toulouse III Paul Sabatier Chemistry FRANCE
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Wilson ASS, Hill MS, Mahon MF. Calcium Hydride Insertion Reactions with Unsaturated C–C Bonds. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00743] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrew S. S. Wilson
- 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
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Ziemann S, Krieck S, Görls H, Westerhausen M. 1,2-Bis(anilido)ethane Complexes of Calcium and Potassium: Synthesis, Structures, and Catalytic Activity. Organometallics 2018. [DOI: 10.1021/acs.organomet.7b00890] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Steffen Ziemann
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, D-07743 Jena, Germany
| | - Sven Krieck
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, D-07743 Jena, Germany
| | - Helmar Görls
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, D-07743 Jena, Germany
| | - Matthias Westerhausen
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstraße 8, D-07743 Jena, Germany
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Koch A, Wirgenings M, Krieck S, Görls H, Pohnert G, Westerhausen M. Hydrocarbon-Soluble Bis(trimethylsilylmethyl)calcium and Calcium–Iodine Exchange Reactions at sp2-Hybrized Carbon Atoms. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00592] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexander Koch
- Institute of Inorganic and Analytical Chemistry and ‡Institute of Inorganic and Analytical
Chemistry, Friedrich-Schiller-University Jena, D-07743 Jena, Germany
| | - Marino Wirgenings
- Institute of Inorganic and Analytical Chemistry and ‡Institute of Inorganic and Analytical
Chemistry, Friedrich-Schiller-University Jena, D-07743 Jena, Germany
| | - Sven Krieck
- Institute of Inorganic and Analytical Chemistry and ‡Institute of Inorganic and Analytical
Chemistry, Friedrich-Schiller-University Jena, D-07743 Jena, Germany
| | - Helmar Görls
- Institute of Inorganic and Analytical Chemistry and ‡Institute of Inorganic and Analytical
Chemistry, Friedrich-Schiller-University Jena, D-07743 Jena, Germany
| | - Georg Pohnert
- Institute of Inorganic and Analytical Chemistry and ‡Institute of Inorganic and Analytical
Chemistry, Friedrich-Schiller-University Jena, D-07743 Jena, Germany
| | - Matthias Westerhausen
- Institute of Inorganic and Analytical Chemistry and ‡Institute of Inorganic and Analytical
Chemistry, Friedrich-Schiller-University Jena, D-07743 Jena, Germany
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Westerhausen M, Koch A, Görls H, Krieck S. Heavy Grignard Reagents: Synthesis, Physical and Structural Properties, Chemical Behavior, and Reactivity. Chemistry 2016; 23:1456-1483. [DOI: 10.1002/chem.201603786] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Matthias Westerhausen
- Institute of Inorganic and Analytical Chemistry; Friedrich-Schiller-Universität Jena; Humboldtstraße 8 07743 Jena Germany
| | - Alexander Koch
- Institute of Inorganic and Analytical Chemistry; Friedrich-Schiller-Universität Jena; Humboldtstraße 8 07743 Jena Germany
| | - Helmar Görls
- Institute of Inorganic and Analytical Chemistry; Friedrich-Schiller-Universität Jena; Humboldtstraße 8 07743 Jena Germany
| | - Sven Krieck
- Institute of Inorganic and Analytical Chemistry; Friedrich-Schiller-Universität Jena; Humboldtstraße 8 07743 Jena Germany
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Izod K, Wills C, El-Hamruni S, Harrington RW, Waddell PG, Probert MR. Structural Diversity in Alkaline Earth Metal Complexes of a Phosphine-Borane-Stabilized 1,3-Dicarbanion. Organometallics 2015. [DOI: 10.1021/om501183p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Keith Izod
- Main Group Chemistry Laboratories,
School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
| | - Corinne Wills
- Main Group Chemistry Laboratories,
School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
| | - Salima El-Hamruni
- Main Group Chemistry Laboratories,
School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
| | - Ross W. Harrington
- Main Group Chemistry Laboratories,
School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
| | - Paul G. Waddell
- Main Group Chemistry Laboratories,
School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
| | - Michael R. Probert
- Main Group Chemistry Laboratories,
School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
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11
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Köhler M, Langer J, Görls H, Westerhausen M. Solution Stability of Organocalcium Compounds in Ethereal Media. Organometallics 2014. [DOI: 10.1021/om5006935] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mathias Köhler
- Institute of Inorganic and
Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstrasse
8, D-07743 Jena, Germany
| | - Jens Langer
- Institute of Inorganic and
Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstrasse
8, D-07743 Jena, Germany
| | - Helmar Görls
- Institute of Inorganic and
Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstrasse
8, D-07743 Jena, Germany
| | - Matthias Westerhausen
- Institute of Inorganic and
Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstrasse
8, D-07743 Jena, Germany
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12
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Abstract
The first calcium-catalysed Nazarov cyclisation is described.
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Affiliation(s)
- Jacob Davies
- School of Chemistry
- University of Bristol
- Bristol BS8 1TS, UK
| | - Daniele Leonori
- School of Chemistry
- University of Bristol
- Bristol BS8 1TS, UK
- School of Chemistry
- University of Manchester
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