Palladium complexes of the chiral diphosphanes 1 and 2 which possess a rigid backbone and a large bite angle catalyze the alkylation of allyl compounds with both high enantioselectivities and reaction rates, particularly with less sterically demanding substrates. 1: R=Me, X=S; 2: R=H, X=C(CH3 )2 .
Keywords: Alkylations; Asymmetric catalysis; Chiral ligands; Homogeneous catalysis; Palladium.
© 1998 WILEY-VCH Verlag GmbH, Weinheim, Fed. Rep. of Germany.