Remarkable solvent effect on the enantioface selectivity in the Diels-Alder reaction catalyzed by an Aluminum complex of a newly prepared chiral menthol derivative
摘要:
Reversal of enantioface selectivity was observed by merely switching die solvent from CH2Cl2 (enantiomer ratio of the adduct = 91:9) to THF (14:86) in the asymmetric Diels-Alder reaction catalyzed by the aluminum complex of a newly prepared chiral menthol derivative. Negative nonlinear effect on the relationship between enantiomeric excesses of the reaction product and optical purities of the ligand was observed for the reaction in CH2Cl2 whilst linear relationship for that in THF. (C) 1997 Elsevier Science Ltd.
Remarkable solvent effect on the enantioface selectivity in the Diels-Alder reaction catalyzed by an Aluminum complex of a newly prepared chiral menthol derivative
摘要:
Reversal of enantioface selectivity was observed by merely switching die solvent from CH2Cl2 (enantiomer ratio of the adduct = 91:9) to THF (14:86) in the asymmetric Diels-Alder reaction catalyzed by the aluminum complex of a newly prepared chiral menthol derivative. Negative nonlinear effect on the relationship between enantiomeric excesses of the reaction product and optical purities of the ligand was observed for the reaction in CH2Cl2 whilst linear relationship for that in THF. (C) 1997 Elsevier Science Ltd.