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The secret behind the efficient formation of a Schiff base aluminum initiator for the controlled polymerization of methacrylates is a nickel catalyst. Bis(acetylacetonato) nickel(II), [Ni(acac)2], in combination with a suitable alkylating agent, catalyzes the transformation of methylmethacrylate (MMA) monomer into the active aluminum centers (see scheme). Highly syndiotactic-enriched (84 %) poly(methylmethacrylate) (PMMA) can be prepared at −20 °C and block copolymers are readily accessible.
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Cameron et al. (2000) studied this question.
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