Thermolysis of polyazapentadienes. Part 9. Gas phase thermolyses of some dienamines, enaminones, and enaminothiones
Abstract
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.