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Structural characterization and dynamic NMR studies of a new peracylated macrocyclic diterpene

✍ Scribed by Gábor Günther; Tamás Martinek; György Dombi; Judit Hohmann; Andrea Vasas

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
122 KB
Volume
37
Category
Article
ISSN
0749-1581

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✦ Synopsis

A heptaester of a new diterpene alcohol was isolated from the dichloromethane extract of the whole plant of Euphorbia esula L. A detailed NMR and mass spectral analysis revealed that its structure is (E)-(2R Ł , 3R Ł , 4S Ł , 5R Ł , 7S Ł , 8R Ł , 9S Ł , 13R Ł , 15R Ł )-2,3,5,8,9-pentaacetoxy-7-isobutanoyloxy-14-oxojatropha-6( 17),11-diene. Its conformation was studied in three different solutions. The temperature dependence of the spectral parameters revealed conformational changes through internal rotation of the macrocycle part of the molecule.

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