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Multiple insertion of ethylene into the TiCH3 bond, the first direct evidence for the role of cationic intermediates in polymerization reactions, is observed upon reaction of the cationic Ti and Zr complexes 3 at low temperatures. Complexes 3 are formed from 1 and 2 in a reaction involving elimination of methane. Under the same conditions, ethylene in excess undergoes polymerization (M = Ti, Zr). equation image
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Bochmann et al. (1990) studied this question.
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