Abstract
The polymerization features of the polymerization of heterocyclic monomers using anionic or coordinated anionic type initiators are examined. The chemical and configurational structure of initiating species depends on the regiospecificity of the ring-opening reaction. Propagating rate constants, solvation and macrocyclisation phenomena are discussed. The structure and the chemical composition of stereospecific initiators are described. Different types of mechanisms (enantiomorphic sites and end-chain) are illustrated. The dependence of selectivity on different parameters is discussed. Various aspects of chiral catalysis leading to stereoelective and enantiogenic processes are presented. Some examples of recent trends in anionic and stereospecific ring-opening polymerization are given.
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