Abstract
The ring proton hyperfine coupling constants of the benzyl, diphenylmethyl and triphenylmethyl radicals are compared with fluorine splittings in the corresponding perfluorophenyl radicals. Trends in the ratio of aF/aH are rationalised in terms of twisting of the phenyl rings; INDO calculations on model systems support this interpretation and suggest that a comparison of ring proton and fluorine hyperfine interactions, particularly at the meta positions, can provide useful stereochemical information.
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