<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Karioti, Anastasia</style></author><author><style face="normal" font="default" size="100%">Bilia, Anna Rita</style></author><author><style face="normal" font="default" size="100%">Gabbiani, Chiara</style></author><author><style face="normal" font="default" size="100%">Messori, Luigi</style></author><author><style face="normal" font="default" size="100%">Skaltsa, Helen</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Proanthocyanidin glycosides from the leaves of Quercus ilex L. (Fagaceae)</style></title><secondary-title><style face="normal" font="default" size="100%">Tetrahedron Letters</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Circular dichroism</style></keyword><keyword><style  face="normal" font="default" size="100%">Fagaceae</style></keyword><keyword><style  face="normal" font="default" size="100%">Oak-leaves</style></keyword><keyword><style  face="normal" font="default" size="100%">Proanthocyanidin glycosides</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus ilex</style></keyword><keyword><style  face="normal" font="default" size="100%">ROESY</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2009</style></year></dates><publisher><style face="normal" font="default" size="100%">Elsevier Ltd</style></publisher><volume><style face="normal" font="default" size="100%">50</style></volume><pages><style face="normal" font="default" size="100%">1771-1776</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">From the polar extracts of the leaves of Quercus ilex L., two new proanthocyanidin glycosides, namely afzelechin-(4a?8)-catechin-3-O-b-glucopyranoside (1) and afzelechin-(4a?8)-catechin-3-O-a-rhamnopyranoside (2), were isolated in addition to catechin (3), proanthocyanidin B3 (4), prodelphinidin C (5), dehydrodicatechin A (6), quercetin (7) and six known ﬂavonol glucosides with their acylated derivatives (8–13) and ellagic acid (14). The structures of all isolated compounds were established by spectroscopic means, mainly 1D and 2D NMR, as well as LC/MS and HR-MS spectrometric analyses. The absolute con- ﬁguration of compound 1 was determined by CD measurements. The proanthocyanidin glycosides are especially interesting, as they possess the sugar in the upper unit of the dimer, which is rare for this type of compounds.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Karioti, A.</style></author><author><style face="normal" font="default" size="100%">Bilia, A. R.</style></author><author><style face="normal" font="default" size="100%">Skaltsa, H.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A novel dimeric proanthocyanidin 3-O-glucoside from Quercus ilex L. (Fagaceae)</style></title><secondary-title><style face="normal" font="default" size="100%">PLANTA MEDICA</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Circular dichroism</style></keyword><keyword><style  face="normal" font="default" size="100%">Fagaceae</style></keyword><keyword><style  face="normal" font="default" size="100%">Oak-leaves</style></keyword><keyword><style  face="normal" font="default" size="100%">Proanthocyanidin glycosides</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus ilex</style></keyword><keyword><style  face="normal" font="default" size="100%">ROESY</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2007///</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">73</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">ity at room temperature in order to deactivate any enzymes and avoid polymerizations and oxidations. Final extraction was carried out using MeOH and MeOH/H2O 8/2. A fast fractionation of the residue was done using VLC over silica gel followed by repeated cc over Sephadex LH-60 and Sephadex LH-20. Fractionations were monitored with HPLC-DAD-MS. The structures of the isolated compounds were established by means of 1D &amp; 2D NMR.</style></abstract><issue><style face="normal" font="default" size="100%">9</style></issue></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Giorgio, Egidio</style></author><author><style face="normal" font="default" size="100%">Maddau, Lucia</style></author><author><style face="normal" font="default" size="100%">Spanu, Emanuela</style></author><author><style face="normal" font="default" size="100%">Evidente, Antonio</style></author><author><style face="normal" font="default" size="100%">Rosini, Carlo</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Assignment of the Absolute Configuration of (+)-Diplopyrone, the Main Phytotoxin Produced by Diplodia mutila, the Pathogen of the Cork Oak Decline, by a Nonempirical Analysis of Its Chiroptical Properties†</style></title><secondary-title><style face="normal" font="default" size="100%">The Journal of Organic Chemistry</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">absolute configuration</style></keyword><keyword><style  face="normal" font="default" size="100%">Circular dichroism</style></keyword><keyword><style  face="normal" font="default" size="100%">DeVoe method</style></keyword><keyword><style  face="normal" font="default" size="100%">diplopyrone (voyant)</style></keyword><keyword><style  face="normal" font="default" size="100%">Mitosporic Fungi</style></keyword><keyword><style  face="normal" font="default" size="100%">Mitosporic Fungi: pathogenicity</style></keyword><keyword><style  face="normal" font="default" size="100%">Models</style></keyword><keyword><style  face="normal" font="default" size="100%">Molecular</style></keyword><keyword><style  face="normal" font="default" size="100%">Molecular Structure</style></keyword><keyword><style  face="normal" font="default" size="100%">mycotoxins</style></keyword><keyword><style  face="normal" font="default" size="100%">Mycotoxins: chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">Optical rotation</style></keyword><keyword><style  face="normal" font="default" size="100%">Plant Diseases</style></keyword><keyword><style  face="normal" font="default" size="100%">Plant Diseases: microbiology</style></keyword><keyword><style  face="normal" font="default" size="100%">Pyrones</style></keyword><keyword><style  face="normal" font="default" size="100%">Pyrones: chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">Stereoisomerism</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2004</style></year></dates><publisher><style face="normal" font="default" size="100%">American Chemical Society</style></publisher><volume><style face="normal" font="default" size="100%">70</style></volume><pages><style face="normal" font="default" size="100%">7-13</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The nonempirical assignment of the absolute configuration of (+)-diplopyrone, the main phytotoxin of Diplodia mutila, i.e., an endophytic fungus, widespread in Sardinian oak forests, and considered one of the main causes of cork oak decline, has been approached by two different methods:? (a) the exciton analysis of the circular dichroism (CD) spectrum and (b) the ab initio calculation of the optical rotatory power. Both methods indicate that (+)-diplopyrone is 6-[(1S)-1-hydroxyethyl]-2,4a(S),6(R),8a(S)-tetrahydropyrano[3,2-b]pyran-2-one, so the stereostructure of this important biomolecule is safely determined for the first time. A comparison of advantages and limitations of the two methods of analysis is also presented.</style></abstract><accession-num><style face="normal" font="default" size="100%">15624901</style></accession-num><notes><style face="normal" font="default" size="100%">From Duplicate 2 (Assignment of the Absolute Configuration of (+)-Diplopyrone, the Main Phytotoxin Produced by Diplodia mutila, the Pathogen of the Cork Oak Decline, by a Nonempirical Analysis of Its Chiroptical Properties† - Giorgio, Egidio; Maddau, Lucia; Spanu, Emanuela; Evidente, Antonio; Rosini, Carlo)</style></notes><research-notes><style face="normal" font="default" size="100%">From Duplicate 2 (Assignment of the Absolute Configuration of (+)-Diplopyrone, the Main Phytotoxin Produced by Diplodia mutila, the Pathogen of the Cork Oak Decline, by a Nonempirical Analysis of Its Chiroptical Properties† - Giorgio, Egidio; Maddau, Lucia; Spanu, Emanuela; Evidente, Antonio; Rosini, Carlo)</style></research-notes></record></records></xml>