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Mayr, Herbert and Wilhelm, Eberhard and Kaliba, Claus (1981): [2 + 2]-Cycloaddition of a stabilised vinyl cation with cyclopentadiene; X-ray crystal structure of the 2 : 1 addition product. In: Journal of the Chemical Society, Chemical Communications: pp. 683-684
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Abstract

Lewis acid-catalysed reaction of 1,1-dimethyl-3-phenylprop-2-ynyl chloride with cyclopentadiene yields a 2 : 1 addition product via[2 + 2]-cycloaddition of an intermediate allenyl cation.