Halogenated alkyl radicals

Abstract
The E.S.R. spectra of the β-fluoroisopropyl radical and the β-fluoro, β,β-difluoro and β,β,β-trifluoroethyl radicals have been recorded in fluid solutions. The conformational preferences and barriers to internal rotation in these species have been determined from an investigation of the temperature dependence of the β-fluorine and β-proton hyperfine coupling constants. The experimental hyperfine splittings have been compared with theoretical values calculated by the INDO method.