Two previously undescribed triterpenoid saponins together with 4 known ones were isolated from the stem bark of Pentaclethra eetveldeana De Wild. & Th. Dur. Their structures were elucidated by spectroscopic methods including 1D and 2D NMR experiments in combination with mass spectrometry as 3- O-β-D-glucopyranosyl-(1→2)-[β-D-glucopyranosyl-(1→3)]-β-D-glucopyranosyl-(1→4)-β-D-glucopyranosyl-(1→3)-α-L-rhamnopyranosyl-(1→2)-[β-D-glucopyranosyl-(1→4)]-α-L-arabinopyranosyloleanolic acid and 3- O-β-D-glucopyranosyl-(1→2)-[β-D-glucopyranosyl-(1→3)]-β-D-glucopyranosyl-(1→4)-β-D-glucopyranosyl-(1→3)-α-L-rhamnopyranosyl-(1→2)-[β-D-glucopyranosyl-(1→4)]-α-L-arabinopyranosylhederagenin.

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Bull. Soc. Chim. Belg. w1.94/n0 2/1985 TRITERPENOrP%S DE DODONAEA VISCOSA. IWloro Zcza D I W I . Mpuza KAPUNDU*, E h d DARmT=, Roger WARIN, C l C r n t DELAUDE e t Robert HULS. h t i t u t de C h i d e , llniverriti do Liage, SART TILllAN par B-4000-LIEa I . Belgique. VCgCtals. Pacult6 de P h a m c i e . UniverritC de Kiwhara, BP 212, K I N S W A X I , Zdre. %ivmrritC du Burundi, PacultC der Sciences. DCpartrmnt *Cantre d'ltuder der Subrtancer Naturellrr d'origiue de Botmique, BP 2700. BUJUIIIIUIU. Burundi. 8.criv.d : 24/01/1985 -Accrptrd : 26/02/1985 ABSTUACT Prom the raponin of the rtem bark. of Dodonma vircora (L.) Jrcq. (Sapindacrar) y. have i r o l a t r d the k m p U i M RI-barrigrnol m d Japrapogenol and tun llovd prorapogenior RI-barrig r w l 21.22-diangrlate and Jrgorapogenol 2I-(2,3-dihydmxy-2~thy1butyrate),22-mgelatr.Structurer have been elucidatrd c h i e f l y by vpactrorcopic r a n i . INlRODUCTION.L'objet de cot a r t i c l e r ' i n r c r i t daw 1 . s u i t e de l'btude chidotaxononique q w noG' conracronr aux Sapindacrae a f r i c a i u e r ; il Ctablit 1 ' i d e n t i t C der g6nio.r a t l a s t r u c t u r e der prorapogininer obtenwr de l a raponiw de Dodonua vircora (L.) JAcq..

-Saponin from leaves of Alrernanrhera sessilis (L.) DC. contains a major component which has been isolated as a peracetylated and methylated derivative. Its structure has been established by NMR spectroscopy and shown to be : 3P-O-(P-D-glucopyranosyluronic acid), 28-0-B-Dglucopyranosyl oleanolic acid. Two dimensional NMR spectral data were used.

Perchloric hydrolysis of the seed saponin of NapoZeonaea uogelii allowed the isolation of two prosapogenins. One of these was identified as napoleogenin. The structure of the second component has been established as 21 6-1 6 deoxy-3,4 diangelate-B-galactopyranosyl loxy 36, I6u. 22a, 24,28 pentahydroxy-olean-12-ene. The name "Napoleogenin B" is proposed f o r this new prosapogenin. On further hydrolysis this saponin yields protoaescigenin, isoaescigenin and aescigenin. The structure of napoleogenol previously obtained by hydrolysis of the saponinof N q l e onaea imperialis is revised and shown to be identical to aescigenin.