CARBONYLATION (HYDROFORMYLATION AND HYDROALKOXYCARBONYLATION) OF STYRENE IN THE PRESENCE OF TRANSITION-METAL FERROCENE-BASED AMINOPHOSPHINESYSTEMS

The PtCl2(L)-type platinum complexes of the ferrocenyl ligands, lpha-N ,N-dimethylamino[2,3]tetramethyleneferrocene (1) and sphino)-alpha-N,N -dimethylamino[2,3]tetramethylene ferrocene (2) have been synthesised. Both the 'preformed' and in situ catalysts have been used in hydrofor mylation of styrene. In spite of low enantioselectivities and activiti es, the ferrocenyl based systems proved to be of interest from theoret ical point of view. The ligand influence on regio- and enantioselectiv ity has been investigated in systems containing either only one of the ferrocenyl ligands or one ferrocenyl ligand together with bdpp ((2S,3 S)-2,4-bis(diphenylphosphino)pentane). The coordination of the respect ive ligands to platinum in the catalytic process can be deduced from r esults obtained with the 'mixed ligand system'. The rhodium in situ ca talysts containing either 1 or 2 are active in hydroformylation but th e ee-s obtained with styrene are low. In the presence of ligand 1, the palladium-catalysed hydromethoxycarbonylation of styrene resulted in the predominant formation of the branched regioisomer, in case of 2 mo stly the linear product was formed. (C) 1998 Elsevier Science S.A. All rights reserved.