OPTICALLY-ACTIVE TITANIUM COMPLEXES CONTAINING LINKED AMIDO-CYCLOPENTADIENYL LIGANDS - THEIR USE AS ASYMMETRIC HYDROGENATION CATALYSTS

Optically active titanium complexes of the formula Ti(eta(5):eta(1)- C (5)R(4)SiMe(2)NCHMePh)Cl-2 (R = H, Me), containing the cyclepentadieny l ligand linked to a chiral 1-phenylethylamido moiety, were synthesize d and characterized in both enantiomerically pure forms. A single-crys tal X-ray structural analysis of S)-(-)Ti(eta(5):eta(1)-C(5)H(4)SiMe(2 )NCHMePh)Cl-2 shows a conformation in which the phenyl group is turned away from the metal center. NOE measurements suggest that a related s tructure is retained in solution. Upon activation with n-butyllithium, these complexes show hydrogenation activity toward imines with slight enantioselectivity.