Structure, absolute configuration, and conformation of a fused complex cyclic carbohydrate from a cameroon plant extract (CAMT2) View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1994-12

AUTHORS

Tapan K. Chattopadhyay, John N. Lisgarten, Rex A. Palmer

ABSTRACT

The crystal and molecular structure of the natural product C29H38O9, an extract from a Cameroonian plant, has been determined by direct methods. Crystals are orthorhombic, P212121,a=24.571(4),b=16.398(3),c=13.778(4) Å,Z-8,Dc=1.270 mg/m3. The final R-factor for 2892 reflections withI>2σ(I) is 0.0531. The two molecules forming the asymmetric unit have very similar molecular geometry. each molecule comprising a nucleus of six fused rings B to G: where B=pyranyl, C=pyranyl, D=furanyl, E=cyclohexene, F=pyranyl, G=cyclohexyl. Ring B also has a furanyl side-group (ring A). The ring conformations in both molecules are: A (1/2-chair/envelope); B(envelope); C(envelope); D(1/2-chair); E(1/2-chair); F(envelope); G(chair). In the cyclohexene ring E the substitution pattern is 2-hydroxy 3-methyl 5-dimethyl. The two molecules in the asymmetric unit are linked by two OH...O hydrogen bonds to form the crystal structure. More... »

PAGES

775-781

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01668240

DOI

http://dx.doi.org/10.1007/bf01668240

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1030335260


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