Catalyse asymetrique et structure du complexe IrCOD((+)-diop)Cl

The structure of IrCOD((+)-diop)Cl was determined by X-ray analysis. The complex is a distorted trigonal bipyramid in which diop(isopropylidene-2,3-dihydroxy-l,4-bis(diphenyl phosphino)butane) behaves as an apical-equatorial bidentate ligand. The general features of the chelated diop are given. The origin of asymmetric induction in reductions catalysed by Rh/diop systems is discussed, in relation to the structure of IrCOD((+)diop)Cl.