10.1021/ja00335a037
The research investigates the kinetics of 1,2-migration of carbon-centered groups in 2-substituted 2,2-dimethylethyl radicals. The purpose of the study was to understand the factors controlling the migration rates of different R groups and to compare their relative migratory aptitudes. The research concluded that migratory aptitudes increase along the series R = N=C < Me,CC=C < Ph < Me,CC=O < H2C=CH, with the preferred pre-exponential factors lying in the range 10^10.9-10^12.0 s^-1, and activation energies varying from 16.4 kcal/mol for R = N=C to 5.7 kcal/mol for R = H2C=CH. The study involved a range of chemicals, including tert-butylbenzene, di-tert-butylacetylene, di-tert-butyl ketone, pivalonitrile, and carbon tetrachloride, among others, to measure the rates of rearrangement relative to the rate of reaction with carbon tetrachloride by GC and GC/MS analyses.