Počet záznamů: 1

Dehydrocoupling of SiMe2H substituents in permethylated zirconocene complexes

  1. 1.
    0358453 - UFCH-W 2012 RIV CZ eng J - Článek v odborném periodiku
    Pinkas, Jiří - Gyepes, R. - Císařová, I. - Kubišta, Jiří - Mach, Karel - Horáček, Michal
    Dehydrocoupling of SiMe2H substituents in permethylated zirconocene complexes.
    Collection of Czechoslovak Chemical Communications. Roč. 76, č. 3 (2011), s. 177-191 ISSN 0010-0765
    Grant CEP: GA AV ČR IAA400400708; GA MŠk(CZ) LC06070
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: metallocenes * zirconium * bridging ligands
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 1.283, rok: 2011

    Complex [Zr{η5-C5Me4(SiMe2H)}2Cl2] (1) was prepared by the reaction of lithium salt of 2,3,4,5-tetramethyl-1-(dimethylsilyl)cyclopenta-2,4-diene with [ZrCl4] in boiling THF. The reduction of 1 with excess magnesium in THF in the presence of excess bis(trimethylsilyl)acetylene (btmsa) afforded the bivalent metal ansa-disilylene complex with π-coordinated btmsa [Zr(η2-btmsa){η5-C5Me4(SiMe2)}2] (2). The dehydrocoupling of SiMe2H groups was accompanied by a hydrogen transfer to releasing btmsa to give a mixture of cis- and trans-1,2-bis(trimethylsilyl)ethene. Chlorination of 2 with PbCl2 afforded ansa-[Zr{η5-C5Me4(SiMe2)}2Cl2] (3) and liberated btmsa. The crystal structures of complexes, 1, 2 and 3 have been determined by X-ray crystallography.
    Trvalý link: http://hdl.handle.net/11104/0196493