The sodium salts of the tosylhydrazones of α-dialkylmethylenecyclopentanones do not cyclise to give 3H-pyrazoles but decompose via loss of nitrogen to give dienes, whereas their diarylmethylene analogues cyclise to give 1,2-benzodiazepines in good yield.
R. H. Findlay, J. T. Sharp and P. B. Thorogood, J. Chem. Soc. D, 1970, 909 DOI: 10.1039/C29700000909
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