The 1H and 19F resonance spectra of 1-fluoro-2,4-dinitrobenzene in pure liquid and in 5 mole per cent solutions in benzene and acetone were obtained and analysed by an iterative computer calculation. The results for the pure liquid are in good agreement with perturbation calculations performed on this spectrum earlier. It is shown that the deviation between the values of coupling constants obtained earlier in benzene solution, acetone solution and pure liquid are not due to the method of analysis.
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D. N. Rao (1964) studied this question.
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