Cycloadditions of arylidene imdines of methyl phenylglycinate show substantial rate enhancement in the presence of Brönsted and Lewis acids; for Brönsted acids the rate is related to the pKa of the acid, whilst for the Lewis acids studied the rate acceleration decreased in the order Zn(OAc)2 > AgOAc > LiOAc > Mg(OAc)2.
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Grigg et al. (1982) studied this question.
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