Dehydrogenation of N-cyclohexyl-pyrrolidines and -piperidines with dibenzoyldi-imides occurs on the heterocycle, in contrast with the analogous reaction of diethyl azodiformate. The enamines so obtained react with more dibenzoyldi-imide to give addition products, identified on the basis of 13C n.m.r. spectra.
L. Marchetti, J. Chem. Soc., Perkin Trans. 2, 1977, 1977 DOI: 10.1039/P29770001977
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