Synthesis and surface properties of alkyl β‑ ‑thioglucopyranoside
作者:Xiubing Wu、Langqiu Chen、Fang Fu、Yulin Fan、Zhiqiang Luo
DOI:10.1016/j.molliq.2018.11.134
日期:2019.2
Alkyl thioglycosides are a class of nonionic sugar-based sulfur-containing surfactants and bioreagents. The surfactants 1,2‑trans alkyl β‑d‑thioglucopyranosides with different alkyl chain length (n = 6–12) were stereoselectively prepared by the Helferich method. Their properties including HLB number, logP value, water solubility, foam property, emulsifying property, surface property and thermotropic
A facile and selective oxidation of sulfides to sulfones
作者:Waldemar Priebe、Grzegorz Grynkiewicz
DOI:10.1016/0040-4039(91)80105-f
日期:1991.12
Sulfides undergo a facile and selective oxidation to sulfones under mild conditions using a catalytic amount of osmium tetroxide and tertiary amineN-oxides (N-methylmorpholine N-oxide or trimethylamineN-oxide). Both N-oxides are equally effective. The observed yields ranged between 60%–95%.
Synthesis and liquid crystalline properties of the n-alkyl 1-thio-α-d-glucopyranosides, a new homologous series of carbohydrate mesogens
作者:Henk A. van Doren、Ralph van der Geest、Richard M. Kellogg、Hans Wynberg
DOI:10.1016/0008-6215(89)85007-4
日期:1989.12
deacetylation. The n -propyl and n -butyl derivatives are not thermotropic, the n -pentyl derivative is monotropic, and the compounds with n -hexyl and longer alkyl chains are enantiotropic, the largest liquidcrystalline range being from ±100–175° for the n -undecyl derivative. The transition point data are typical for smectic behavior, and X-ray data and texture observations are indicative of a smectic A d phase
n-Octyl (Thio)glycosides as Potential Cryoprotectants: Glass Transition Behaviour, Membrane Permeability, and Ice Recrystallization Inhibition Studies
作者:Rekha Raju、Theresa Merl、Madeleine K. Adam、Emiliyan Staykov、Robert N. Ben、Gary Bryant、Brendan L. Wilkinson
DOI:10.1071/ch19159
日期:——
and varying anomeric configuration were synthesized and evaluated for glass transition behaviour, membrane permeability, and ice recrystallization inhibition (IRI) activity. Of these, n-octyl β-d-glucopyranoside (2β) exhibited a high glass transition temperatures (Tg), both as a neat sample and 20 wt-% aqueous solution. Membrane permeability studies of this compound revealed cellular uptake to concentrations
Non-Amphiphilic Carbohydrate Liquid Crystals Containing an Intact Monosaccharide Moiety
作者:E. Smits、J. B.F.N. Engberts、R. M. Kellogg、H. A. Van Doren
DOI:10.1080/10587259508038691
日期:1995.2
A chiral rigid moiety which forms the basis of a new class of non-amphiphilic carbohydrate liquid crystals has been developed. This moiety contains a fully intact glucopyranose ring embedded in a trans-decalin structure. The original carbohydrate is substituted so that only two hydroxyl groups are left, resulting in derivatives with reduced hydrophilicity. The substituents R and X-R' on the 4,6-O-ylidene beta-D-glucopyranoside are in the equatorial position and can be varied extensively, using straightforward synthetic procedures. Investigations as to the requirements for R and X-R' for inducing liquid-crystalline behavior have shown that at least one of the substituents should contain a large, polarizable aromatic moiety. An aromatic Schiff base fulfils this requirement.