Abstract
A catalyst system containing an electrophilic center and a sterically hindered nucleophilic center in one molecule was applied to the cycloaddition reaction of CO 2 and epoxides. This intramolecularly two-centered cooperation catalyst showed activity even at a high [epoxide]/[catalyst] ratio up to 50 000 under mild conditions such as solvent-free, ambient temperature, and low CO 2 pressure. The reaction of CO 2 with ( S)-propylene oxide at 80 °C in the presence of the bifunctional catalyst gives ( S)-propylene carbonate in 96% ee with retention of stereochemistry.
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