Benzylideneacetophenone oxime, when treated with isopentyl nitrite in methanol, is converted into an NN′-dihydroxybipyrazolyl NN′-oxide (2) which in turn can be oxidized to a tetra-azafulvalene derivative (1)
J. P. Freeman and J. F. Hansen, J. Chem. Soc., Chem. Commun., 1972, 961 DOI: 10.1039/C39720000961
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