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New routes to transform donor–acceptor cyclopropanes in the presence of Lewis acids have been found. The reaction of dimethyl 2-phenylcyclopropan-1,1-dicarboxylate, a typical representative of this class of compounds, with an equimolar amount of anhydrous GaCl 3 gives, depending on the reaction time, (2-phenylethylidene)malonate or styrylmalonate after hydrolysis, whereas in the presence of...
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