Abstract
The stereochemistry of polymerization of living PMMA anions in THF in the presence of Li and Cs ions at various temperatures was investigated. The NMR method used allowed an evaluation of the relative rates of propagation of enolates having meso or racemic stereochemistry of the two asymmetric centers adjoining the carbanion. Foe both the Li/THF and Cs/THF cases, it was found that the overall r(m) diad content of the chain matches the fraction of r - or m - chain ends. The stereoschemistry of methylation was also investigated and was shown to be quite similar to that of monomer addition
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