Abstract A large amount of interesting information on the alternating copolymerization of CO 2 with terminal epoxides has already been reported, such as the regiochemistry of epoxide ring-opening and the stereochemistry of the carbonate unit sequence in the polymer chain. Moreover, the microstructures of CO 2 copolymers from propylene oxide and cyclohexene oxide have also been well-studied. However, the microstructure of the CO 2 copolymer ...