13C nuclear magnetic resonance spectra of some limonoids. Part I. The structure of procerin, an extractive from Carapa procera
Abstract
The structure (8) is suggested for procerin, a limonoid of the utilin group extracted from the timber of Carapa procera(Meliaceae), on the basis of chemical and spectroscopic properties, including 13C n.m.r. spectra. Tables are given of the 13C n.m.r. spectra of a number of other limonoids.