A novel di-iron(iii) catalyst for the copolymerisation of cyclohexene oxide and CO2 to yield poly(cyclohexene carbonate), under mild conditions, is reported. The catalyst selectivity was completely changed on addition of an ammonium co-catalyst to yield only the cis-isomer of the cyclic carbonate, also under mild conditions. Additionally, the catalyst was active for propylene carbonate and styrene carbonate production at 1 atm pressure.
Buchard, A., Kember, M. R., Sandeman, K. G., & Williams, C. K. (2011). A bimetallic iron(iii) catalyst for CO2/epoxide coupling. Chemical Communications, 47(1), 212-214. https://doi.org/10.1039/C0CC02205E