Thermolysis of the title compounds gives low yields of pyrroles by a hydrogen-transfer–cyclisation–aromatisation sequence. The results are best explained by a dipolar mechanism for the hydrogen-transfer step: competitive aromatisation routes account for the range of substituted pyrroles which were obtained.
C. L. Hickson and H. McNab, J. Chem. Soc., Perkin Trans. 1, 1988, 339 DOI: 10.1039/P19880000339
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