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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Transition metal benzyne complex ： ウィキペディア英語版 Transition metal benzyne complex Transition metal benzyne complexes are organometallic complexes that contain benzyne ligands (C6H4). Unlike benzyne itself, these complexes are less reactive although they undergo a number of insertion reactions.〔Buchwald, S. L.; Nielsen, R. B. "Group 4 Metal Complexes of Benzynes, Cycloalkynes, Acyclic Alkynes, and Alkenes" Chem. Rev. 1988, volume 88, 1047-1058〕 ==Examples== The studies of metal-benzyne complexes were initiated with the preparation of zirconocene complex by reaction diphenylzirconocene with trimethylphosphine.〔Buchwald, S. L.; Watson, B. T. The Trimethylphosphine Adduct of the Zirconocene-Benzyne Complex: Synthesis, Reactions, and X-ray Crystal Structure. J. Am. Chem. Soc. 1986, 108, 7411-7413〕 :Cp2ZrPh2 + PMe3 → Cp2Zr(C6H4)(PMe3) + PhH The preparation of Ta(η5-C5Me5)(C6H4)Me2 proceeds similarly, requiring the phenyl complex Ta(η5-C5Me5)(C6H5)Me3. This complex is prepared by treatment of Ta(η5-C5Me5)Me3Cl with phenyllithium.〔McLain, S. J.; Schrock, R. R.; Sharp, P. R.; Churchill, M. R.; Youngs, W. J. Synthesis of Monomeric Niobium- and Tantalum-Benzyne Complexes and Molecular Structure of Ta(η5-C5Me5)(C6H4)Me2" J. Am. Chem. Soc. 1979, volume 101, 263-265. 〕 Upon heating a solution of this complex, methane was lost, leaving the benzyne complex: :Ta(η5-C5Me5)(C6H5)Me3 → Ta(η5-C5Me5)(C6H4)Me2 + CH4 The nickel derivative Ni(η2-C6H4)(Cy2PCH2CH2PCy2) was the second type metal-benzyne complex to be reported and structurally characterized. Synthesis involves dehalogenation of the chlorophenyl complex NiCl(C6H4Br-2)(Cy2PCH2CH2PCy2) with sodium amalgam, which furnished the yellow nickel(0) benzyne complex. Its coordination geometry is close to trigonal blanar and the benzyne ligand was determined to be planar. However, both the nickel and phosphorus atoms were found to be slightly displaced to one side of the benzyne plane. This complex reacts with a variety of electrophiles.〔 With trifluoroacetic acid, benzene is lost to give the trifluoroacetate:〔Bennett, M. A.; Hambley, T. W.; Roberts, N. K.; Robertson, G. B. "Synthesis and Single-Crystal X-ray Study of the Mononuclear η2-Benzyne (Dehydrobenzene) Nickel(0) Complex Ni(η2-C6H4)((C6H11)2PCH2CH2P(C6H11)2). Insertion Reactions with Simple Molecules and X-ray Crystal Structure of the Nickelaidan Complex Ni(CH2CH2C6H4-o)((C6H11)2PCH2CH2P(C6H11)2)" Organometallics 1985, 4, 1992-2000.〕 :Ni(η2-C6H4)(Cy2PCH2CH2PCy2) + 2 CF3CO2H → Ni(O2CCF3)2(Cy2PCH2CH2PCy2 + C6H6 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Transition metal benzyne complex」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.