The pyrimidines (4) are isolated from the products of photolysis of the sulphimides (1) and of the tetrazoles (2); pyrolysis of the tetrazoles gives benzimidazoles (5) in addition to the pyrimidines, the formation of these products being rationalised by mechanisms involving successive [1,5] or [1,9] shifts in 3aH-benzimidazole intermediates.
T. L. Gilchrist, C. J. Moody and C. W. Rees, J. Chem. Soc., Chem. Commun., 1976, 414 DOI: 10.1039/C39760000414
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