The structure of the cycloadducts from 2-cyano-trans-stilbene oxide with acetylenic and olefinic dipolarophiles confirm the electrocyclic C–C ring scission of the oxiran while the cycloadditions of 3 cyano-trans- and cis-stilbene oxide to dimethyl fumarate establish the conrotatory course.
A. Dahmen, H. Hamberger, R. Huisgen and V. Markowski, J. Chem. Soc. D, 1971, 1192 DOI: 10.1039/C29710001192
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