CYCLODIMERIZATION AND ADDITION-REACTIONS OF BU(T)C-EQUIVALENT-TO-P ATA COBALT(I) CENTER

Syntheses and characterisation of [Co(eta5-C5Me4CH2CH2CH=CH2)(eta5-C2B u2(t)P2)] and [Co2(eta5-C5Me4CH2-CH2CH=CH2)2(CO)(COPCBu(t))] are repor ted. The former has been prepared by four different routes, resulting from cyclodimerisation of Bu(t)C=P within the coordination sphere of c obalt(I) and the mechanistic pathway for its formation is discussed. T he latter results from addition of Bu(t)C=P to the Co=Co double bond o f [Co2(eta5-C5Me4CH2CH2CH=CH2)2(CO)2]. Both complexes have been charac terised by P-31{H-1}, C-13{H-1}, H-1 NMR and mass spectroscopic studie s.