Abstract
Polymerizations of racemic mixtures of epoxides or episulfides may lead to stereoregular polymers through a stereoselective process, and to optically active polymers through a stereoelective process that gives either atactic or isotactic polymers. Monomers that have been most studied are propylene oxide, propylene sulfide and t-butyl thiirane, and their polymerization with insoluble initiators such as alcoholates of Zn is discussed, and also the polymerization of thiiranes in homogeneous phase using cadmium thiolates.
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