Abstract
Asymmetric hydroformylation of styrene by rhodium catalysts modified with aminophosphinephosphinite ligands has been studied. Use of either Rh 4(CO) 12/L ★ 2 mixture or RhClCOL ★ 2 in electroreduction under CO/H 2, gives interesting results in respect of regio- (PhCHMeCHO/PHCH 2CH 2CHO) and enantio-selectivity when the ligands (1 R,2 S)-PPh 2NMeCHMeCHPhOPPh 2 and (CH 3) 2C(N(Me)PPh 2)-HCH 2OPPH 2 (e.e. > 30%) are used. 1H and 31P NMR spectroscopy has indicated the occurrence of the RhH(CO) 2L ★ 2 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 (PO) group and the two CO moieties.
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