Structural and Spectroscopic Demonstration of Agostic C−C Interactions in Electron-Deficient Metallacyclobutanes and Related Cage Complexes: Possible Implications for Olefin Polymerizations and Metatheses
作者:Benjamin G. Harvey、Charles L. Mayne、Atta M. Arif、Richard D. Ernst
DOI:10.1021/ja052287b
日期:2005.11.30
electron-deficient titanium center passes up potential pi coordination of the allyl fragment, it instead engages in interactions with one or two C-C bonds, and perhaps a C-H bond, as revealed from the structural and spectroscopic data. Similar interactions have been found in electron-deficient metallacyclobutane complexes of titanium and zirconium, but not in the 18-electron molybdenum and tungsten analogues. These
Preparations and reactions of bis(η-cyclopentadienyl) compounds containing covalent aluminium–molybdenum or –tungsten bonds
作者:Malcolm L. H. Green、Robert E. MacKenzie、John S. Poland
DOI:10.1039/dt9760001993
日期:——
AlMe3 to give compounds (II) and (III) containing Mo–Al bonds. Compound (II) reacts with allyl chloride to give the compound [Mo(η-C3H5)(η-C5H5)2][PF6]. Following treatment of compound (II) with carbon dioxide, the carbonyl compound [MoBr(η-C5H5)2(CO)][PF6] may be isolated. The dihydride [W(η-C5H5)2H2] reacts with AlMe3 to give a related tungsten–aluminium compound. The compounds and reactions are discussed
的二氢化物[沫(η-C 5 H ^ 5)2 ħ 2 ]与阿尔梅发生反应3,得到化合物(II)和(III)含有Mo-Al键。化合物(II)反应与烯丙基氯,得到化合物[沫(η-C 3 H ^ 5)(η-C 5 H ^ 5)2 ] [PF 6 ]。在用二氧化碳,羰基化合物[MoBr(η-C处理化合物(II)的5 ħ 5)2(CO)] [PF 6 ]可以被分离。的二氢化物[W(η-C 5 H ^ 5)2 ħ 2]与AlMe 3反应生成相关的钨铝化合物。讨论了化合物和反应。