The isomeric triazoles 4-methyl-5-phenyl-1-phthalimido-1,2,3-triazole (1) and 5-methyl-4-phenyl-1-phthalimido-1,2,3-triazole (2) have been pyrolysed in the vapour phase at 400–500°, and give the same products, which involve the antiaromatic 1H-azirine derivative, 2-methyl-3-phenyl-1-phthalimido-1H-azirine (3), as a common intermediate.
T. L. Gilchrist, G. E. Gymer and C. W. Rees, J. Chem. Soc. D, 1971, 1519 DOI: 10.1039/C29710001519
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