2,3-Diazidonaphthalene gives trans-1,2-dicyano-1,2-dihydrobenzocyclobutene on flash pyrolysis in the vapour phase. No evidence for the formation of 2,3-didehydronaphthalene was found in the vapour phase or in solution.
Treatment of methyl 3-azido-2-naphthoate with hydrazine gave 1,2-dihydrobenz[f]indazol-3-one in high yield rather than the expected hydrazide.
M. E. Peek, C. W. Rees and R. C. Storr, J. Chem. Soc., Perkin Trans. 1, 1974, 1260 DOI: 10.1039/P19740001260
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