Abstract
The reaction of Rh 2Cl 2(C 2H 4) 4 with (+)-DIOP in benzene as solvent leads to isolation of the compound [RhCl(DIOP)(C 6H 6)] 2 which is highly air-sensitive even in the solid state and gives an oxidized complex which can be reactivated in the presence of hydrogen. Carbon monóxide transforms it into the carbonyl complex RhCl(CO)(DIOP), while a non-coordinating anion in alcoholic medium leads to the cationic complex: Rh(DIOP)(C 2H 5OH) 2 +B(C 6H 5) 4 −. The catalytic properties of these complexes in the asymmetric hydrogenation reaction have been tested. Optical rotation measurements were made under various conditions, and allowed some assumptions about the equilibria which exist in the hydrogenation reaction medium.
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