Liquid crystal compounds and method for preparing the same
AssigneeDongjin Semichem Co., Ltd.
InventorsKyung-Hee Choi, Sun-Hee Lee, Jin-Wook Choi
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Abstract
The present invention relates to a liquid crystal compound for liquid crystal display. More particularly, the present invention provides a vinylcyclohexylbenzene, its derivatives and the preparation method thereof where the present invention produces only trans-isomer by using Heck coupling reaction instead of Wittig reaction in the introduction to ethenyl group in the central backbone in the preparation process of intermediate. The liquid crystal compound can make the liquid crystal composition have a wide mesophase range and low viscosity.
Claims11
A liquid crystal compound represented by chemical formula 1:
- where R is C1-C15 alkyl and n is 1 or 2.
A liquid crystal compound represented by chemical formula 2:
- where R is C1-C15 alkyl and n is 1 or 2.
A preparation method of a liquid crystal compound represented by chemical formula 1, comprising the steps of
- preparing trans-compound of chemical formula 4 by reducing the compound of chemical formula 5 with sodium bis(2-methoxyethoxy)aluminum anhydride, and
- reacting the trans-compound of chemical formula 4 according to Wittig reaction:
- where R is C1-C15 alkyl and n is 1 or 2.
A preparation method of a liquid crystal compound represented by chemical formula 2, comprising the steps of
- hydrogenating the compound of chemical formula 5 to produce the compound of chemical formula 5-1,
- preparing the compound of chemical formula 3 by reducing the compound of chemical formula 5-1 with sodium bis(2-methoxyethoxy)aluminum anhydride, and
- reacting the compound of chemical formula 3 according to Wittig reaction:
- where R is C1-C15 alkyl and n is 1 or 2.
A preparation method of a liquid crystal compound represented by chemical formula 2, comprising the steps of
- hydrogenating the compound of chemical formula 13 to produce the compound of chemical formula 12,
- hydrolyzing the compound of chemical formula 12 to produce the compound of chemical formula 11,
- reacting the compound of chemical formula 11 according to Wittig reaction to produce the compound of chemical formula 10,
- hydrolyzing the compound of chemical formula 10 to produce the compound of chemical formula 3, and
- reacting the compound of chemical formula 3 according to Wittig reaction:
- where R is C1-C15 alkyl and n is 1 or 2.
A liquid crystal composition comprising at least one selected from the group consisting of the compound of chemical formula 1 and the compound of chemical formula 2:
- where R is C1-C15 alkyl, and n is 1 or 2.
Dependencies are inferred from the claim text.