Ketens undergo 2 + 2 cycloaddition to the C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
N bond of the imidoylazimines (1) to give the β-lactams (2) which are cleaved on heating to give either benzocinnoline and 1,2,4,4-tetrasubstituted imidazolin-5-ones (5) or the triazolines (7), depending on the keten substituents.
J. J. Barr and R. C. Storr, J. Chem. Soc., Chem. Commun., 1975, 788 DOI: 10.1039/C39750000788
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