Photolysis of the 3H-thieno-1,2-diazepines (1) affords the 3-vinylthienopyrazoles (2), whereas their thermolysis gives the thienylpyrazoles (3)via a [1,5] hydrogen shift in the diazepine ring; this mechanism has been confirmed by a deuterium-labelling experiment.
T. Tsuchiya, M. Enkaku and H. Sawanishi, J. Chem. Soc., Chem. Commun., 1978, 568 DOI: 10.1039/C39780000568
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