Abstract
New series of chiral dopants for cholesteric liquid-crystal compositions were synthesized on the base of 2-substituted allobetuline derivatives, and their steric structure was determined by X-ray analysis. The relationship between spatial structure of these compounds and their ability to induce cholesteric helix in 4-pentyl-4′-cyanobiphenyl nematic solvent was examined. The highest values of the helical twisting power |β| (71.38 ± 3.4) and (84.25 ± 3.7) mkm−1 mol·pats−1 showed (E)-2-(4-chlorophenylmethylidene)-allobetuline and (2R,3R)-3-(4′-chlorophenyl)-2,2′-spiro-oxyranoallobetuline correspondingly. How the value of |β| in this series of compounds varies depending on the spatial arrangement relative to the aryl moiety of the chiral core is shown.
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