“…Since the catalytic coupling of CO 2 with epoxides was first reported by Inoue and co-workers in 1969 [13], quite numerous catalytic processes about the cycloaddition have been documented [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. However, most catalysts, such as metalhalides [14,15], metal oxides [16,17], organometallic compounds [18][19][20], Lewis acid/bases [21], and zeolites [22], suffer from low catalytic activity or need harsh reaction conditions (high pressures of CO 2 and high temperatures), limiting their practicality.…”