Highly isotactic polylactide with a high melting temperature was synthesized from rac -lactide through an organocatalytic route using dimeric phosphazene base 1- tert -butyl-2,2,4,4,4-pentakis(dimethylamino)-2Λ 5,4Λ 5 -catenadi(phosphazene) (P 2 - t -Bu) catalyst at low temperature. Microstructural analysis of the prepared polymer using homodecoupled 1 H NMR spectroscopy revealed the formation of a stereoblock architecture containing long isotactic sequence of R and S blocks in the main chain. A proposed mechanism involving chain-end control and stereoerror explains the stereoselective polymerization.
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Zhang et al. (2007) studied this question.
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