21823-29-0Relevant articles and documents
Chemistry of the cyclopentoxy and cyclohexoxy radicals at subambient temperatures
Orlando, John J.,Iraci, Laura T.,Tyndall, Geoffrey S.
, p. 5072 - 5079 (2007/10/03)
The Cl-atom initiated oxidation mechanisms of both cyclopentane and cyclohexane have been studied as a function of temperature using an environmental chamber/FTIR technique. The oxidation of cyclohexane leads to the formation of the cyclohexoxy radical, the chemistry of which is characterized by a competition between ring-opening (R5) and reaction with O2 (R6) to form cyclohexanone. The yield of cyclohexanone is shown to increase with decreasing temperature, and a rate coefficient ratio k6/k5 = (1.3 ± 0.3) × 10-27 exp(5550 ± 1100/T) cm3 molecule-1 is obtained. The energy barrier to ring-opening is estimated to be 11.5 ± 2.2 kcal/mol. The dominant fate of the cyclopentoxy radical, formed in the Cl-atom initiated oxidation of cyclopentane, is ring-opening under all conditions studied here (230-300 K, 50-500 Torr O2), with only a minor contribution from the O2 reaction at the lowest temperatures studied. The barrier to ring-opening for the cyclopentoxy radical is probably less than 10 kcal/mol.
