SYNTHESE ET REACTIVITE DE NOUVEAUX DIHYDRUROZIRCONOCENES ET-HAFNOCENES SUBSTITUES ACHIRAUX ET CHIRAUX

Article abstract of DOI:10.1016/S0022-328X(00)93312-6

Hydrogenolysis of (M(CH3)2) (M=Zr, Hf) bonds gives new racemic and optically active substituted zirconocene and hafnocene dihydrides A: (RCp)2MH2 (M=Zr, Hf; R=Me, Me2CH, Me3C, PhCH2) and B: (R^*Cp)2MH2 (M=Zr, Hf; R^*=MeCHEtCH2, PhCHEtCH2), R^*CpCpHfH2 (R^*=PhCHCH3).Substitution of hydridic hydrogens by halogens, mobile hydrogen compounds, addition with unsaturated derivatives are studied.The A and B type complexes are good catalysts in hydrogenation of alkenes; the B type complexes give only poor asymmetric induction in catalytic reduction of prochiral alkenes.