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C-Acetyl-N-arylnitrilimines (2) react with acetaldehyde, alkanone, and cycloalkanone benzoylhydrazones (3) to give the cycloaddition products 4-benzoylamino-4,5-dihydro-1,2,4-triazoles (4–15) rather than the tetrazine cyclocondensation products (16).
The author wishes to thank Dr. W. Schrader, Max-Planck Institut fuer Kohlenforschung, Muelheim, Germany, for obtaining the mass spectra.
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