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The electron resonance spectra of some fluorobenzyl radicals and fluorobenzaldehyde radical anions are reported. The observed hyperfine coupling constants are discussed in terms of π-electron spin densities estimated from semi-empirical molecular orbital calculations. Only one isomer is observed in the spectrum of the o-fluorobenzaldehyde radical anion, whereas two isomers are observed in the meta compound.
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Hudson et al. (1970) studied this question.
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