ASYMMETRIC HYDROFORMYLATION OF STYRENE WITH PTCL2 (ATROPOISOMERIC DIPHOSPHINE) SNCL2 SYSTEMS

The new chiral complex [PtCl2{(S)-(-)-MeOBIPHEP}], where MeOBIPHEP is the atropoisomeric diphosphine 2,2'-bis( diphenylphosphino)-6,6'-dimet hoxy-1,1'-biphenyl, has been synthesized. In the presence of SnCl2 thi s species is an efficient catalyst for the asymmetric hydroformylation of styrene. Asymmetric inductions are higher than those attainable us ing the system [PtCl2{(R)-(+)-BINAP}]/SnCl2, where BINAP is 2,2'-bis(d iphenylphosphino)-1,1'-binaphthyl. The influence of CO and H-2 partial pressures on the catalytic activity of the [PtCl2{(S)-(-)-MeOBIPHEP}] /SnCl2 system has also been studied.