Shape Dependence in the Formation of Condensed Phases Exhibited by Disubstituted Sucrose Esters
作者:Valérie Molinier、Paul J. J. Kouwer、Juliette Fitremann、Alain Bouchu、Grahame Mackenzie、Yves Queneau、John W. Goodby
DOI:10.1002/chem.200600368
日期:2007.2.12
We report on the self-organizing properties of sucrose esters that are di-(1',6', 1',6, and 6,6')-substituted with aliphatic chains of identical or different chain lengths and levels of saturation. For the materials possessing two saturated aliphatic chains, the compounds exhibited thermotropic lamellar smectic A phases. A remarkable new phase transition was observed for the di-octadecanoyl homologue
Self-Organizing Properties of Monosubstituted Sucrose Fatty Acid Esters: The Effects of Chain Length and Unsaturation
作者:Valérie Molinier、Paul J. J. Kouwer、Juliette Fitremann、Alain Bouchu、Grahame Mackenzie、Yves Queneau、John W. Goodby
DOI:10.1002/chem.200500773
日期:2006.4.24
Three families of mono-substituted sucrosefattyacidesters were prepared by enzymatic and classical synthetic procedures, and their self-assembly and self-organizational properties were investigated by thermal polarised light microscopy, differential scanning calorimetry and X-ray diffraction. The properties were evaluated as a function of the fattyacidchainlength. For the lower homologues of the
Sucrosefattyacidesters were synthesized by the transesterification of sucrose with aliphatic esters under ultrasound irradiation in good yield (73%). The optimum reaction conditions for the transesterification reaction include a molar ratio of sucrose to fattyacid ethyl ester of 2:1 and the use of a 13%mol anhydrous K(2)CO(3) catalyst. The optimum reaction temperature was set at 70 degrees C, the
Sucrose esterification under Mitsunobu conditions: evidence for the formation of 6-O-acyl-3′,6′-anhydrosucrose besides mono and diesters of fatty acids
A series of sucrose monoesters and homogeneous or mixed diesters, which have various chain lengths and saturation levels, were prepared under Mitsunobu conditions with good regioselectivity. Among the anhydro derivatives arising from competitive intramotecular etherification, 3,6'-anhydrosucrose 6-O-monoesters, which have never been reported, were identified. (C) 2004 Elsevier Ltd. All rights reserved.