Abstract
Models studies of end copping of living polystyryl anions with and without α-methylstyrene at the chain ends, with Me 3 SiCl and MeOCH 2 Cl were done. Various parameters were studied and the results indicated that multiple peaks in NMR spectra are due to chain-end tacticity. Selective stereoisomer formation is indicated when α-methylstyrene is the terminal unit before end-coping. The tacticity at the chain-ends had no dependence on the molecular weight and hence provides a facile way to determine the bulk polymer tacticity
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