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.