Relative reactivities of some carbon-hydrogen bonds in hydrogen abstraction by methyl radicals at 950 K
作者:F.-D. Kopinke、M. Remmler、H. Mensing、P. Hugo
DOI:10.1021/j100055a021
日期:1994.1
Relative reactivities of C-H bonds in alkylbenzenes in the hydrogen abstraction by methyl radicals at about 950 K were determined by means of labeled compounds. The following values normalized to the primary aliphatic C-H bond were obtained: r(Ph-H) = 0.7 +/- 0.1; r(Bz-H) = 4.6 +/- 0.5; r(sec,benzyl) = 8.7 +/- 1.0; r(tert,benzyl) = 9.0 +/- 1.0. The combination of these high-temperature values with low-temperature kinetic data from the literature reveals the absence of a straight connection between strength and reactivity of C-H bonds.