Synthesis, thermal properties, and cytotoxicity evaluation of hydrocarbon and fluorocarbon alkyl β-d-xylopyranoside surfactants
作者:Wenjin Xu、Gifty Osei-Prempeh、Carolina Lema、E. Davis Oldham、Renato J. Aguilera、Sean Parkin、Stephen E. Rankin、Barbara L. Knutson、Hans-Joachim Lehmler
DOI:10.1016/j.carres.2011.11.020
日期:2012.2
fluorocarbon (-(CH(2))(2)C(6)F(13)) alkyl beta-d-xylopyranosides in four steps from d-xylose by acylation or benzoylation, bromination, Koenigs-Knorr reaction, and hydrolysis, with the benzoyl protecting group giving better yields compared to the acyl group in the Koenigs-Knorr reaction. All alkyl beta-d-xylopyranosides formed thermotropic liquid crystals. The phase transition of the solid crystalline phase
Stereoselective Formation of Glycosyl Sulfoxides and Their Subsequent Equilibration: Ring Inversion of an α-Xylopyranosyl Sulfoxide Dependent on the Configuration at Sulfur
作者:David Crich、Jan Mataka、Lev N. Zakharov、Arnold L. Rheingold、Donald J. Wink
DOI:10.1021/ja0122694
日期:2002.5.1
was significantly higher in the case of the beta-mannoside than of the beta-xyloside. The two alpha-xylo sulfoxides have different conformations of the pyranoside ring with the (R)(S)-isomer adopting the (1)C(4) chair and the (S)(S)-diastereomer the (4)C(1). Each pair of diastereomeric sulfoxides was thermally equilibrated in C(6)D(6) and in CD(3)OD. In the mannose series the kinetic isomers are also