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The strong Lewis acid B(C6F5)3 adds to the bis(enolate)-Group 4 metallocenes 1 to give the adducts 2. Complex 1/B(C6F5)3 mixtures, especially in an overstoichiometric ratio, provide very active catalysts for the polymerization of methyl vinyl ketone.
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Spaether et al. (1998) studied this question.
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