Abstract
Cycloaddition of diphenylnitrile ylide to dicyanocyclobutene and of a mesoionic oxazolium-5-olate to isopropylidenecyclobutenone yields dihydroazepine derivatives by cleavage of the strained internal σ-bonds in the primarily formed bicyclic adducts.
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Martin, HD., Mais, FJ., Mayer, B. et al. 4,5-Dihydro-1H-azepine aus aktivierten Cyclobutenen und 1,3-Dipolen. Monatsh Chem 114, 1145–1147 (1983). https://doi.org/10.1007/BF00799039
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DOI: https://doi.org/10.1007/BF00799039