
TY  - JOUR
A1  - Arthur, NL 
A1  - Newitt, PJ 
T1  - Reactions of Methyl Radicals. II. Hydrogen Abstraction from Methyl Trifluoroacetate
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1979
VL  - 32
IS  - 5
SP  - 1025
EP  - 1030
KW  - 
UR  - https://doi.org/10.1071/CH9791025 
N2  - Hydrogen abstraction from CF3COOCH3 and CH3COCH3 by CH3 radicals CF3 + CF3COOCH3 &#8594; CH4 + CF3COOCH2 (1) CF3 + CF3COOCH3 &#8594; CH4 + CH3COCH2  (3) has been studied in the temperature range 117-244º. The rate constants, based on the value of 1013.34 cm3 mol-1 s-1 for the recombination of CH3 radicals, are given by (k in cm3 mol-1 s-1 and E in J mol-1) :  logk1 = (10.39 ± 0.11)- (37680 ± 880)/19.145T logk3 = (11.53 ± 0.02)- (40590 ± 170)/19.145T CF3COOCH3 is less susceptible to attack by CH3 radicals than by CF3 radicals by a factor of 2.8 at 400 K, due mainly to a difference in A factors, since the activation energies of the two reactions are almost identical. These results can be rationalized in terms of intermolecular polar repulsion between the CF3 radical and CF3COOCH3. 
ER  -

