New Stereochemical Assignments of 13C NMR Signals for Predominantly Syndiotactic Polystyrene.
Based on 13C NMR studies on 3 different polystyrenes, the authors revised their earlier published results on the syndioselectivity of the living anionic styrene polymn. with heteroleptic benzylcalcium compds. with regard to the J-ade assignments. It is pointed out, that the ipso-C region should not be assigned on a pentad but on a heptad level. The earlier reported syndiotacticities of polystyrenes are therefore significantly higher.
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