The fast flow method with laser induced fluorescence detection of CH 3C(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 CH 3C(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 Δf H298O (CH 3C(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.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry