Etude par RMN du 13C d'Hydroxy-4 Coumarines Substituées en 3. Analyse par Corrélation des Effets de Substituants

Carbon-13 chemical shifts and ¹³C-¹H coupling constants of 3-substituted 4-hydroxycoumarins and 4-hydroxy-7-methoxycoumarins are determined. A three-parameter correlation with ? and ? of Swain and Lupton and Q of Schaefer applied to these compounds provides linear relationships for the prediction of chemical shifts from substituent parameters.