Abstract
Abstract Ethanolysis of 1-aryl-5,7-di-t-butyl-2-phenylspiro[2.5]octa-1,4,7-trien-6-one 2 proceeds via a vinyl cation generated by opening of the cyclopropene ring, judging from regiospecific ring opening and kinetics (ρ+=−3.0, m= 0.53, and rate dependence on pH of the solvent).
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