Rate constant for the reaction of CH3C(O)CH2 radical with HBr and its thermochemical implication |
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Authors: | Edit Farkas,Gergely Kov cs,Istv n Szil gyi,S ndor D b ,Tibor B rces,Ferenc M rta |
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Affiliation: | Edit Farkas,Gergely Kovács,István Szilágyi,Sándor Dóbé,Tibor Bérces,Ferenc Márta |
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Abstract: | The fast flow method with laser induced fluorescence detection of CH3C(O)CH2 was employed to obtain the rate constant of k1 (298 K) = (1.83 ± 0.12 (1σ)) × 1010 cm3 mol?1 s?1 for the reaction CH3C(O)CH2 + HBr ? CH3C(O)CH3 + Br (1, ?1). The observed reduced reactivity compared with n‐alkyl or alkoxyl radicals can be attributed to the partial resonance stabilization of the acetonyl radical. An application of k1 in a third law estimation provides ΔfH(CH3C(O)CH2) values of ?24 kJ mol?1 and ?28 kJ mol?1 depending on the rate constants available for reaction ( ‐1 ) from the literature. © 2005 Wiley Periodicals, Inc. Int J Chem Kinet 38: 32–37, 2006 |
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