Abstract
An asymmetric oxidative cross-coupling polymerization with a binary catalyst system of an achiral or chiral copper complex and a Lewis acid was investigated. Both the copper and Lewis acid catalysts significantly affected the catalyst activity, cross-coupling and stereoselectivities during the polymerization. The polymerization of methyl 3,7-dihydroxynaphthalene-2-carboxylate using a copper(I)-bisoxazoline catalyst at room temperature under an O2 atmosphere in the presence of Yb(OTf)3 proceeded with a cross-coupling selectivity of 97%.
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