Chiral Bisphospholane Ligands (Me-ketalphos): Synthesis of Their Rh(I) Complexes and Applications in Asymmetric Hydrogenation.

Abstract Rhodium complexes of functionalized bisphospholane ligands ( S , S , S , S -Me-ketalphos) 1 and ( R , S , S , R -Me-ketalphos) 2 have been used as catalyst precursors for the asymmetric hydrogenation of several different types of functionalized olefins and have achieved high enantioselectivities.