Thermotropic and lyotropic properties of long chain alkyl glycopyranosides
摘要:
A systematic structure variation of a classical amphiphile (dodecyl-P-D-glucopyranoside) is performed, demonstrating the influence of anomeric linkage, configuration, ring size and flexibility as well as electric charges on the mesophase behaviour. In addition, we have investigated the thermotropic and lyotropic properties of some long chain alkyl glycosides with monosaccharide headgroups. The thermotropism was measured with polarizing microscopy and differential scanning calorimetry, and additionally the lyotropism with FTIR spectroscopy and X-ray diffraction. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.
Fragmentation of the chain in the mass spectra of the pyrrolidides of alkylcyclohexanecarboxylic acids
摘要:
AbstractThe electron impact mass spectra of the pyrrolidides of both the cis‐ and trans‐octylcyclohexanecarboxylic acids show the structure of the aliphatic chain, despite the steric hindrance of a direct H transfer from the chain to the functional group.