The chiral dirhodium(Ⅱ) catalyst Rh2(MEAZ)4 increases diastereocontrol for intermolecular O-H insertion reactions of diazo esters having a chiral auxiliary over that achieved with Rh2(OAc)4.

Immobilized dirhodium (Ⅱ) catalysts having mixed chiral ligands enhance reactivity (AH) azetidinone) and influence stereoselectivity in cyclopropanation and carbon-hydrogen insertion reactions.

Chiral aryl diphosphite ligands derived from binaphthol were found to be effective in the nickel-catalyzed hydrocyanation of a variety of olefins. Enantioselective hydrocyanations of styrene, 4-substituted styrenes and norbornene were achieved with excellent regioselectivity and moderate enantioselectivity. The hydrocyanation of vinyl acetate gave 72.9% ee. The catalytic activity and the enantioselectivity of the Ni(0)-diphosphite complexes were found to be highly dependent on the structures of the ligands.