The rate constants for isomerization of 2-aryl-2-methylpropyl-1 to 1-aryl-2-methylpropyl-2 radicals have been measured by EPR spectroscopy over a range of temperatures. The radicals were derived by hydrogen abstraction from the following compounds: tert-butylbenzene, 1,3-di-tert-butylbenzene, 4-tert-butylpyridine, 2,6-di-tert-butylpyridine, and 2-tert-butylnaphthalene. The rates of isomerization of the radicals derived from the two pyridines and the naphthalene are significantly faster than the rates of isomerization of the radicals from the two benzenes.
Journal of the American Chemical Society98, no. 5 (1976): 1224–1226.