Abstract The thermal reaction of propene was examined around 800 K in the presence of less than 20% oxygen. At initial time, the production of H 2, CH 4, C 2 H 4, C 2 H 6, allene, C 3 H 8, 1, 3-butadiene, butenes, 3-and 4-methylcyclopentene, a mixture of 1, 4-and 1, 5- hexadienes, methylcyclopentane (or dimethylcyclobutane), 4-methylpent-1-ene, and hex-1- ene, was observed along with hydrogen peroxide, CO, and small quantities of ethanal and ...