Cycloaddition of mesoionic compounds with diphenylcyclopropen-one and -thione, and tosylimino- and dicyanomethylene-cyclopropene occurs across the endocyclic C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
C double bond, whereas cycloaddition of benzonitrile oxide with diphenylcyclopropenone occurs across the CO double bond to give triphenyl-1,3-oxazin-6-one by a new type of rearrangement.
H. Matsukubo and H. Kato, J. Chem. Soc., Chem. Commun., 1974, 412 DOI: 10.1039/C39740000412
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