Abstract
We have discovered that in the presence of a proton trap to trap protic impurities, BCl 3 alone can initiate the polymerization of isobutylene, leading to low molecular weight asymmetric telechelic polyisobutylenes carrying a BCl 2 head group and a tertiary chloro end group. Two polymerization schemes are proposed to explain the results, one based on initiation by self-dissociation of BCl 3 and another involving halohoration-initiation. Kinetic and mechanistic studies support the proposed new initiation mechanism via haloboration and explain the apparent livingness of the polymerization
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