Catalytic Asymmetric Cycloaddition of Carbon Dioxide and Propylene Oxide Using Novel Chiral Polymers of BINOL‐Salen‐ Cobalt(III) Salts

Abstract

Abstractmagnified imageFour new chiral polymers of BINOL‐Salen‐cobalt(III) salt complexes have been designed, synthesized and applied to the direct fabrication of chiral propylene carbonate from racemic propylene oxide. The (R/S)‐polymer catalyst 2 and (S/R)‐polymer catalyst 4 exhibit better enantioselectivity than the (R/R)‐polymer catalyst 1 and the (S/S)‐polymer catalyst 3 and have been recovered and reused more than ten times without loss of activity and enantioselectivity.