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Abstract
The polymerization of cyclohexene oxide with several ZnEt2-modified initiator systems known to be stereospecific for the polymerization of chiral monosubstituted oxiranes was studied. Among chiral initiator systems only ZnEt2/(1S,2R) ephedrine system allowed us to prepare polymers with high optical activities. The sign of the latter changes with polymer conversion. Fractionation experiments and 1H and 13C NMR studies have shown that the polymers obtained with ZnEt2/(1S,2R)-ephedrine and ZnEt2/ 1-methoxy-2-propanol systems were a mixture of isotatic as well as syndiotactic polymers. A mechanism of polymerization is proposed to explain this unusual result.
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