Studies in sulphur heterocyles. 2—The13C NMR spectra of thienocoumarins
摘要:
Abstract13C NMR spectra of 3‐ substituted thieno[2,3‐h][1]benzopyran‐2‐ones and 8‐substituted thieno[3,2‐f]‐[1]benzopyran‐7‐ones are reported and the substituent dependence of certain 13C chemical shifts is noted.