The four isomeric ethylidene-cyclobutanes from R-(–)-1,3-dimethylallene and acrylonitrile are all optically active, a result excluding non-dissymmetric reactive intermediates in the cycloadditions.
J. E. Baldwin and U. V. Roy, J. Chem. Soc. D, 1969, 1225 DOI: 10.1039/C29690001225
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