Thermolysis of the pyrazoline formed form 5-diazo-10,11-dihydro-5H-dibenzo[a,d]cycloheptene and 2,5-dimethyl-1,4-benzoquinone gives the component diazoalkane and quinone via 1,3-dipolar cycloreversion, in competition with nitrogen extrusion to give the cyclopropane derivative.
T. Oshima and T. Nagai, J. Chem. Soc., Chem. Commun., 1994, 2787 DOI: 10.1039/C39940002787
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