Article name: Perfectly Alternating and Regioselective Copolymerization of Carbonyl Sulfide and Epoxides via Metal-free Lewis Pairs，Jia-Liang Yang, Hai-Lin Wu, Yang Li, Xing-Hong Zhang,* and Donald J. Darensbourg*, 

Article link: http://onlinelibrary.wiley.com/wol1/doi/10.1002/anie.201701780/abstract