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Information × Registration Number 0214U006251, 0113U003294 , R & D reports Title Optically active menthothiophene derivatives using as chiral components for liquid crystalline materials popup.stage_title Head Vashchenko Valeriy Vladimirovich, Registration Date 26-02-2014 Organization State Scientific Institution "Institute for Single Crystals", National Academy of Sciences of Ukraine popup.description2 In the current research work was shows that both photo-stable and photosensitive compounds can be obtained starting from the same chiral compound - 3- cyanomentotiophen. Structure of key intermediates of both types of compounds proved by NMR and mass spectroscopy. Their stereochemistry was finally proved by X-ray analysis. It is shown that both types of target products are capable to efficient induction of helical ordering in nematic liquid crystals (twisting ability is -57 and -59 m-1, respectively. We have found that the process of photoisomerization of target compounds is irreversible and is accompanied by the formation of derivatives of annealed benzotiophene. Helical twisting powers of both product of phototransformation are in several times smaller than the starting compound. It is allowed the using of photosensitive substances in LCD composites. Helical pitch of both starting compound and their mixtures formed in coarse of photo irradiation was only slightly dependent on temperature, which is favorable for their practical application. Product Description popup.authors Ващенкео В.В. Кривоший О.І. popup.nrat_date 2020-04-02 Close