Une 6tude plus d6taill6e du mode d'apparition des polytypes hexagonaux de sulfure de titane sera publi6e ult6rieurement. R6f6rences Structure Cristalline de la (4-)-Lupanine PAR HERVl~ DOUCERAIN, ANGI~LE CHIARONI ET CLAUDE RICHE Institut de Chimie des Substances

C16HnN3, M=245.25; monoclinic, P2~/c; a= 8.066 (4), b= 6.563 (3), c= 23.849 (7) A, fl=93.4(l) °, Z=4, dcalc = 1"29 g cm -3. The structure has been refined by full-matrix least-squares calculations to a final R value of 0.068 with 1221 observed intensities.

The elucidation of the structure of bonafousine, WE report the elucidation of the structure of the dirneric a novel dimeric alkaloid from Bonnfousia tetrastachya, indole alkaloid bonafousine ( l ) , extracted from leaves of from its spectral properties (u.v., c.d., i.r., and lH and Bonafousia tetrastachya (Humboldt, Bonpland, and Kunth) 13C n.m.r.) and X-ray crystal structure analysis is Markgraf (Apocynaceae) .I This major alkaloid was isolareported.ted by standard methods (ca. 0.02% yield from dried plant material and 12% of the total alkaloids) : m.p. 199-200 "C

No abstract

No abstract