Abstract
In the first part of the article the chemistry of silyl-substituted Fischer-type carbene complexes is reviewed. The presence of a silyl substituent at the carbene carbon considerably changes the properties of complexes of the type (CO) 5MC(XR)SiR′ 3 (M Cr, Mo, W). Depending on the group XR, fragmentation of the carbene ligand (XR OR or NHR), formation of stable 16-electron carbene complexes (CO) 4MC(NR 2)SiR 3, or formation of ketenes Ph 3Si(RX)CCO (X O, S) is observed. In the second part two novel methods for the formation of metal-carbon double bonds are discussed, both involving elimination of R 3SiCl: in the first method anionic silyl complexes are used as equivalents of dianionic complexes in the reaction with geminal dihalides, in the second 1-chloro-1-trimethylsilylalkenes are brought into reaction with unsaturated metal fragments.
Published Version
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