Cycloaddition Reaction of Carbon Dioxide to Epoxides Catalyzed by Polymer-Supported Quaternary Phosphonium Salts

Table 1

Cycloaddition reactions of CO₂ to ECH catalyzed by different catalysts.

Catalyst	P content (%)	Yield (%)	Selectivity (%)
PS-QPS-1	5.0	98.6	99.4
PS-QPS-2	2.1	78.9	97.9
PIL-1	8.7	93.3	100
PIL-2	9.4	92.4	97.4
PBu3	15.3	5.3	89.6
CMPS	0	—	—

Reaction conditions: ECH 3 mL, catalyst 0.08 g, 5 MPa CO₂, 150°C, and 6 h.