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In order to establish the reactivity of positions 3 an d 4 in substituted coumarins, the values of the chemical shifts in several coumarins have been correlated with the σ Hammett constant. The statistically results computed show that there is a direct relation between the frequencies of proton 3 in the NMR spectra and the Hammett constant, whereas no direct correlation is possible for position 4 due to the conjugation of the carbonyl group.
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