Kinetics of the reaction of the 2,4,6-tri-tert-butylphenoxyl radical with aromatic amines under quasiequilibrium conditions, and the dissociation energy of the N-H bond in aromatic amines
Negative activation energies and compensation effects for the reactions of diarylaminyl radicals with phenols
作者:V. T. Varlamov、N. N. Denisov、V. A. Nadtochenko
DOI:10.1007/bf00713594
日期:1995.12
The temperature dependence of the rate constants of the reaction of 4,4'-disubstituted diphenylaminyl radicals (ArAr'N-.) with phenols has been studied by a laser pulse photolysis technique. The linear relationships between activation energies E(1) (negative in the majority of cases) and logarithms of pre-exponential factors logA(1) have been established. These results coincide with the two-parametric correlations of logk(1) with sigma(+) constants of substituents in phenol and aminyl radicals under isothermal conditions. The reaction rate constants decrease considerably when toluene is used instead of n-decane.
Reactivity of Tris(trimethylsilyl)silane toward Diarylaminyl Radicals
作者:Vladimir T. Varlamov、Evguenii T. Denisov、Chryssostomos Chatgilialoglu
DOI:10.1021/jo010408u
日期:2001.9.1
Absolute rate constants for the reaction of tri-tert-butylphenoxyl radical (ArO*) with (TMS)(3)SiH were measured spectrophotometrically in the temperature range 321-383 K. Rate constants for the hydrogen abstraction from (TMS)(3)SiH by diarylaminyl radicals of type (4-X-C(6)H(4))(2)N* were determined by using a method in which the corresponding amines catalyze the reaction of ArO* with (TMS)(3)SiH
Kinetics of the reaction of the 2,4,6-tri-tert-butylphenoxyl radical with aromatic amines under quasiequilibrium conditions, and the dissociation energy of the N-H bond in aromatic amines