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Synthese d'antibiotiques triterpeniques a partir d'acides biliaires : V. Etude du dichroisme circulaire optique et de la modelisation moleculaire de differents ceto-3 derives de l'acide lithocholique

โœ Scribed by G. Aranda; M. Fetizon; N. Tayeb


Publisher
Elsevier Science
Year
1987
Tongue
French
Weight
439 KB
Volume
43
Category
Article
ISSN
0040-4020

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โœฆ Synopsis


In order to interpret the Cotton effect in circular dichroism of various derivatives of methyl 3-ketocholanate, in the 5a and 5B series, a conformational study of 10 such compounds has been carried out by Allinger force-field method . The results of this theoretical analysis give a sound basis to the interpretation of the circular dichroism data, and show the limitation of this technique in structural investigation . Resume -Afin d'interpreter l'effet Cotton en dichrofsme circulaire de derives du ceto-3 cholanate de methyle en serie 5a et 58, une etude conformationnelle de 10 de ces ccm~oses a et@ realisee oar la methode du champ de force dIAllinger . Les resultats de cette analyse theorique donnent une base solide I l'interpretation des donnees du dichroVsme circulaire et montrent les limites de cette technique dans les recherches structurales .


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Synthese d'antibiotiques triterpeniques
โœ G Aranda; M Fetizon; N Tayeb ๐Ÿ“‚ Article ๐Ÿ“… 1987 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 806 KB

Catalytic hydrogenation of methyl 4.4 dimethyl chol-5 en-3-one-24 oate, prepared fran lithocholic acid has been carefully studied in a variety of conditions (solvent, temperature, pressure, nature and amount of catalyst) . Fairly mild conditions have been found, which lead to the