Kinetics of the hydrogen abstraction from propane, n-butane, isobutane, and cyclopentane by difluoroamino-radicals

Abstract

The rates of hydrogen abstraction from propane, n-butane, isobutane, and cyclopentane by difluoroamino-radicals have been measured in the gas phase between 352 and 463 K. The Arrhenius parameters obtained were as follows (log A/cm³ mol^–1 s^– followed by E/kJ mol^–1): Me₂CH₂: 10·39 ± 0·78, 94·42 ± 6·41; EtCH₃: 11·80 ± 0·51, 108·98 ± 4·21; MeEtCH₂: 12·29 ± 0·19, 103·37 ± 1·46; Me₃CH: 11·04 ± 0·15 86·15, 86·15 ± 1·13; cyclopentane; 11·36 ± 0·29, 92·26 ± 2·28. The activation energies have been compared with those of similar abstractions by other radicals. The rate coefficients for the reverse reactions were calculated from thermochemical considerations.