Journal of Molecular Catalysis A-Chemical, Vol.165, No.1-2, 231-242, 2001
Direct immobilization of chiral auxiliaries on mineral supports and heterogeneous enantioselective allkylation of benzaldehyde with diethylzinc
New solid chiral auxiliaries are used in the enantioselective alkylation of benzaldehyde with diethylzinc. These auxiliaries are obtained by direct immobilization of their homogeneous counterparts, (-)-ephedrine and (-)-O-methyl-ephedrine. on the surface of mesoporous micelle templated silicates and aluminosilicates. Hybrid materials are characterized, and the interactions between the heteroatoms of the organic compounds and the surface are studied by FTIR spectroscopy. Efficiency of such hybrid solids is discussed.
Keywords:heterogeneous enantioselective catalysis;alkylation;mesoporous silica;supported aminoalcohols