In the thermal cyclisation of α,β;γ,δ-unsaturated diazo-compounds the type (6) with a cis hydrogen atom at the terminal carbon atom undergo 1,7 ring closure to give 3H-1,2-diazepines while those (9) with a methyl group at that position take an alternative reaction path to give pyrazoles via 1,5 cyclisation.
I. R. Robertson and J. T. Sharp, J. Chem. Soc., Chem. Commun., 1983, 1003 DOI: 10.1039/C39830001003
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