LIMONOIDS FROM TURRAEA-FLORIBUNDA

Extracts of the root bark of Turraea floribunda have yielded four new limonoids of the havanensin class: 28-nor-4 alpha-carbomethoxy-11 beta -acetoxy-12 lbutanoyloxy)-14,15-deoxyhavanensin-1,7-diacetate; 28-nor- 4 alpha-carbomethoxy-11 beta-hydroxy-12 methylbutanoloxy)-14,15-deoxyh avanensin-1-acetate; 18-nor-4 alpha-carbomethoxy-11 beta-acetoxy-12 et hylbutanoyloxy)-14,15-deoxyhavanensin-1-acetate; and 28-nor-4 alpha-ca rbomethoxy-7-deoxy-7-oxo-11 beta-acetoxy-12 ethylbutanoyloxy)-14,15-de oxyhavanensin-1-acetate. The structures were determined by spectroscop ic methods. The structure for the first of these compounds was also co nfirmed by X-ray diffraction methods.