Abstract
The reaction of PtCl 2L (L = diphosphine) with the appropriate diphosphine L′ in ethanol followed by reduction with aqueous sodium borohydride leads to either disproportionation to give mixtures of the bis(diphosphine) complexes PtL 2 and PtL′ 2 or to the formation of the mixed ligand complex PtLL′ depending on the diphosphines. Mixed ligand complexes are obtained when L=Ph 2P(CH 2) 2PPh 2, L′ = Ph 2P(CH 2PPh 2 cis-Ph 2PCH CHPPh 2, Ph 2P(CH 2) 2AsPh 2, Ph 2- P(CH 2) 4PPh 2, o-Ph 2PC 6H 4PPh 2; and L=(C 6H 11) 2P(CH 2 2P(C 6H 11) 2, L′= Ph 2P(CH 2)PPh 2, Ph 2P(CH 2) 2PPh 2 cis-Ph 2PCHCHPPh 2, (2 S,3 S)-Ph 2PCH- (CH 3)CH(CH 3)PPh 2, ( R)-Ph 2PCH(CH 3)CH 2PPh 2. When L=Ph 2P(CH 2) 4PPh 2 L′= Ph 2P(CH 2 3PPh 2 or cis-Ph 2PCHCHRPh 2 the mixed ligand complexes are obtained but extensive disproportionation also occurs.
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