2013
A Macrocyclic Dimeric Diterpene with a C2 Symmetry AxisJ. Jesús Manríquez-Torres, J. Martín Torres-Valencia, René Velázquez-Jiménez, Alejandro Valdez-Calderón, José G. Alvarado-Rodríguez, Carlos M. Cerda-García-Rojas, and Pedro Joseph-Nathan, Org. Lett., 2013, 15 (18), pp 4658?4661DOI: 10.1021/ol401890v
Abstract
An unprecedented macrocyclic dimeric diterpene containing a C2 symmetry axis was isolated from Acacia schaffneri. This compound, named schaffnerine, was characterized as (5S,7S,8R,9R,10S,17S,5?S,7?S,8?R,9?R,10?S,17?S)-7,8:7,17?:16,17:17,7?:7?,8?:16?,17?-hexaepoxy-7,8-seco-7?,8?-seco-dicassa-13,13?-diene (1) from its spectroscopic data. Comparison of its experimental vibrational circular dichroism spectrum with that calculated using density functional theory, at the B3LYP/DGDZVP level, assigned its preferred conformation and absolute configuration. The latter was confirmed by evaluation of the Flack and Hooft parameters obtained after single-crystal X-ray diffraction analysis.
Antioxidant constituents from Geranium bellum Rose
Estudio químico de cinco plantas mexicanas de uso común en la medicina tradicional
Lead, Cadmium and Cobalt (Pb, Cd, and Co) Leaching of Glass-Clay Containers by pH Effect of Food
Effect of the particle size on the activity of MoOxCy catalysts for the isomerization of heptane