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It has been discovered that the living polymerization of isobutylene (IB) can be induced by MeORt/BCl3 initiating systems in CH2C12or CH3C1 at −10 and −30°C. Diagnostic proof for the living polymerizations are 1) proportionality of M n to polyisobutylene (PIB) formed and 2) independence of number of PIB chains of amount of PIB formed. By the use of agedC(CH3)3CH2OMe/BCl3 and C6H5C(CH3)2OMe/BCl3 systems, initiation efficiency (leff) ≍ 100% and M n is determined by the [monomer]0/[initiator]0 ratio. Polymerizations quenched by methanol yielded f-chloro end groups.
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Mishra et al. (1987) studied this question.
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