Optically Active Oxiranes and Thiiranes

For example, in the case of oxiranes and thiiranes one must prepare first the corresponding chiral 1,2 diols, and the overall yields from starting materials to final cyclic monomers are sometimes less than 5%. Price and Osgan [1] were the first to polymerize with different initiators the dextrorotatory propylene oxide. Several other optically active oxiranes and thiiranes were successfully prepared and polymerized [2, 3]. 

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