Abstract
A strong enhancement of the enantiomeric excess can be obtained by performing the enantioselective aldol reaction of Chan's diene in the presence of enantiomerically enriched Ti(O- i-Pr) 4/BINOL catalysts derived from mixing pre-prepared solutions of enantiopure Ti(O- i-Pr) 4/( R)-BINOL and Ti(O- i-Pr) 4/( S)-BINOL at different concentrations.
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