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Liquid Crystalline Norcholesterylesters: Influence of the Axial Methylgroups on the Phase Transitions and the Cholesteric Helix
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1989
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Helical Screw SensePhase TransitionsCrystal StructureEngineeringMacromolecular ChemistrySupramolecular AssemblyMolecular BiologyAxial MethylgroupsLiquid Crystalline ElastomerOrganic ChemistryCholestene SkeletonChemistryCrystal FormationBiophysicsBiochemistryLiquid Crystalline NorcholesterylestersCrystallographyBiomolecular EngineeringMacromolecular ScienceNatural SciencesPhase Transition TemperaturesSynthetic Chemistry
Liquid crystalline norcholesteryl anisic esters were prepared in which the methylgroups 19, 21, 27, and 18 are removed successively from the cholestene skeleton. The influence of the axial methylgroups on the phase transition temperatures and the choleric helical structure has been investigated. On heating the 18.19.21.27-tetranorcholesteryl ester, at 155 °C an inversion of the helical screw sense from left to right was observed