Structure du mascaroside principe Amer de Coffea vianneyi

Mascaroside C26H36O11, a bitter principle, was recently isolated from the malagasy species Coffea vianneyi. It was submitted to structural studies by different chemical and physical methods. NMR and mass spectra of hexaacetylmascaroside proved a glucopyranose fragment, two acetylable hydroxyls and a third one probably tertiary. A dienone chromophore is present according to UV and IR spectra, and confirmed by NMR spectrum which reveale a tertiary methyl. A direct study of mascaroside by X-ray crystallography corroborate above data and give the complet structure of the product as a pentacyclic diterpene glycoside. Cafamarine, previously extracted from C. buxifolia must have a closely related structure with only one acetylable hydroxyl

Bibliographic Details

Main Authors:	75868 Hamonniere, M., 63530 Ducruix, A., 103492 Pascard-Billy, C., 106033 Poisson, J., 3180 Association Scientifique Internationale du Café, París (Francia), 33814 7. Colloque International sur la Chimie des Cafés Verts, Torrefies et Leurs Derives Hambourg (Alemania, R.F.) 1975
Format:	biblioteca
Published:	París (Francia) 1976
Subjects:	PROPIEDADES FISICO-QUIMICAS, ANALISIS QUIMICO, COFFEA VIANNEYI, COMPOSICION DEL GRANO,
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