Abstract
The e.s.r. spectrum of the radical PhCHCH2F has been studied for a variety of solvents and over a range of temperature. INDO calculations have been carried out for several conformations of the radical. The evidence suggests that rotation about the C–CH2F bond is hindered, with one of the rotamers strongly destabilized by steric interaction between the fluorine atom and the phenyl group. E.s.r. spectra of a number of related radicals have also been studied. Rotation of CH2F and CHF2 substituents is hindered, and some of the radicals appear to be significantly non-planar at the radical centre.
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