Reaction between DADZnR2 and either B(C6F5)3 or ZnR2 and [DADH][B(C6F5)4] affords three-coordinate alkyl and amide zinc cations which are active for the ring opening polymerisation of epoxides and ε-caprolactone [DAD = (MeCNC6H3Pri2-2,6)2].
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Hannant et al. (2002) studied this question.
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