THE ¹³C-NMR SPECTRUM OF SOME NATURAL OCCURRING COUMARINS

The ¹³C-NMR spectral data of eighteen natural coumarins (Ⅱ-ⅪⅩ) belonging to four basic skeleton types and some substituent effects are presented and discussed. Among eighteen coumarins, the ¹³C-NMR spectral data of apaensin, turgeniifolin A, turgeniifolin B and turgeniifolin C were included.The present result is useful for determining structures as well as assigning ¹³C signals of natural coumarins of these skeleton types.