Atactic and isotactic poly(3,4dimethylstyrenes)(poly(3,4-DMSt)h)a ve been subjected to benzylic radical bromination using either the N-bromosuccinimidebenzoyl peroxide (NBS-BPO) or the Br2-K2C03-light systems. Brominated and unbrominated polymers were studied by 13C NMR spectroscopy. A remarkable difference in the chemical reactivity of the methyl groups in positions 3 and 4 of the benzene ring between atactic poly(3,4-DMSt) and isotactic poly(3,4-DMSt) was observed. These results suggest a conformational control of the polymer main chain on the chemical reactivity of the two methyl groups on the benzene ring toward the bromine substitution reaction
Conformational Control of Radical Benzyl Bromination in Polymers from Methylstyrenes
Andrea Raffaelli;
1987
Abstract
Atactic and isotactic poly(3,4dimethylstyrenes)(poly(3,4-DMSt)h)a ve been subjected to benzylic radical bromination using either the N-bromosuccinimidebenzoyl peroxide (NBS-BPO) or the Br2-K2C03-light systems. Brominated and unbrominated polymers were studied by 13C NMR spectroscopy. A remarkable difference in the chemical reactivity of the methyl groups in positions 3 and 4 of the benzene ring between atactic poly(3,4-DMSt) and isotactic poly(3,4-DMSt) was observed. These results suggest a conformational control of the polymer main chain on the chemical reactivity of the two methyl groups on the benzene ring toward the bromine substitution reactionI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
