Although cis-azo-dienophiles were found to add in a (4 + 2)π manner to N-ethoxycarbonylazepine, the trans-azo-dienophile diethyl azodicarboxylate underwent reaction via a (6 + 2)π course contrary to the Hoffmann–Woodward correlations.
W. S. Murphy and J. P. McCarthy, J. Chem. Soc. D, 1970, 1129 DOI: 10.1039/C29700001129
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