Abstract
Abstract Chiral primary-tertiary diamine/Bronsted acid conjugates were selectively immobilized on the inner surface of mesoporous silica and used as catalyst for the asymmetric aldol reaction of acetone with various aldehydes. The catalyst showed modest reactivity and enantioselectivity and can be reused 6 times without loss of activity and enantioselectivity. As compared with silica gel as the support, an increase in ee value of the reaction product was observed with the SBA-15-immobilized organic catalyst. This was believed to be due to the confinement effect of the nanopores.
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