Utilisation des ligands aminophosphinephosphinites en hydroformylation catalysée par le rhodium: amélioration de l'énantioselectivité par synthèse selective des hydrures RhH(CO)2L2

Asymmetric hydroformylation of styrene by rhodium catalysts modified with aminophosphinephosphinite ligands has been studied. Use of either Rh₄(CO)₁₂/L₂ mixture or RhClCOL₂ in electroreduction under CO/H₂, gives interesting results in respect of regio- (PhCHMeCHO/PHCH₂CH₂CHO) and enantio-selectivity when the ligands (1R,2S)-PPh₂NMeCHMeCHPhOPPh₂ and (CH₃)₂C(N(Me)PPh₂)-HCH₂OPPH₂ (e.e. > 30%) are used.

¹H and ³¹P NMR spectroscopy has indicated the occurrence of the RhH(CO)₂L₂ hydride precursor, suggested to be responsible for catalysis. It is a trigonal complex having an aminophosphine function in a trans position to the hydrogen, the equatorial position being occupied by the (P---O) group and the two CO moieties.