trans- and cis-Dicyanostilbene oxides establish an equilibrium at 100–120°via carbonyl ylides; the carbonyl ylide intermediate is a 1,3-dipole and undergoes cycloadditions with a variety of acetylenic and olefinic dipolarophiles.
H. Hamberger and R. Huisgen, J. Chem. Soc. D, 1971, 1190 DOI: 10.1039/C29710001190
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