(Diazomethyl)silyl-functionalized Fischer-type carbene complexes

The synthesis of two types of so far unknown title compounds is described. Carbene complexes LnMC(R)OSiR2C(N2)COOMe [LnM(OC)5W (3), (OC)5Cr (4), (OC)5Mo (5), (MeCp)(OC)2Mn (6)] were obtained from the corresponding acyl metalates by electrophilic (diazomethyl)silylation. Similarly, (diazomethyl)silylation of lithiated dicarbonyl(η5-methylcyclopentadienyl)(1-ethoxyethylidene)manganese yielded a manganese carbene complex (8a) with CH2SiR2C(N2)COOMe substitution.