Trimethylsilylmethyl and other alkyls of chromium, molybdenum, ruthenium, and rhodium from interaction of magnesium dialkyls with metal–metal bonded binuclear acetates of chromium(<scp>II</scp>), molybdenum(<scp>II</scp>), ruthenium(<scp>II</scp>,<scp>III</scp>), and rhodium(<scp>II</scp>)

Abstract

The interaction between dialkylmagnesium MgR2(R = Me, CH2SiMe3, or CH2CMe3) and binuclear transition-metal acetates M2II(O2CMe)4(M = Cr, Mo, and Rh) and Ru2II,III(O2CMe)4CI, containing metal–metal bonds in the presence of trimethylphosphine yields either monomeric or dimeric alkyls. In the latter the metal–metal bond is retained as in Mo2Me4(PMe3)4 or Mo2(ButCH2)2(O2CMe)2(PMe3)2. Loss of a hydrogen from a methyl group of CH2SiMe3 results in the formation of metallacycles [graphic omitted]H2 and [graphic omitted]H2. The various compounds have been studied by 1H, 13C and 31P n.m.r. and i.r. spectroscopy and the results of structural determinations by X-ray crystallography are reported.