The formation of a benzimidazole (III) or pseudourea derivative (IV) when the starting tetrazole (I) is irradiated in different solvents is attributed to an azomethine biradical or nitrene intermediate and the mass spectral properties of (I) and (III) indicate a novel 1,3-O→N phenyl migration.
F. L. Bach, J. Karliner and G. E. Van Lear, J. Chem. Soc. D, 1969, 1110b DOI: 10.1039/C2969001110B
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