Organosilicon chemistry. Part 26. Silyl derivatives of substitued cobalt carbonyls of the type [Co(SiR3)(CO)n L4–n]

Abstract

The series of cobalt(I) silyl complexes [Co(SiR₃)(CO)_n L_4–n](R = F, n= 1–3; R = Ph or OEt, n= 2 or 3; L = tertiary phosphine or arsine) has been prepared, and the reaction of [Co(SiR₃)(CO)₄] with PPh₃ has been studied. For R = Ph, substitution of CO occurs rapidly to give the unstable cis-[Co(SiPh₃)(CO)₃(PPh₃)], which isomerises slowly to the stable trans form. For R = Et, however, decomposition occurs to give Si₂Et₆ and [{Co(CO)₃(PPh₃)}₂]. Three distinct geometric isomers of [Co(SiR₃)(CO)₂ L₂] have been obtained by different preparative routes.