Abstract
This minireview is written to explain (speculate) upon the reasons for the dramatic differences in product distribution observed upon coupling of carbon dioxide (CO2) or carbonyl sulfide (COS) with specific epoxides under the same catalytic reaction conditions. That is, based on known results of CO2 or COS reactivities with well-defined metal-alkoxide and -phenoxide complexes, the formation of cyclic carbonates vs polycarbonates from CO2 as compared to COS is rationalized for epoxides possessing bulky substituents. This comparison concludes that although copolymers produced from CO2 and COS with epoxides are structurally similar, COS is not a good model for CO2 reactivity in these processes.
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