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Cyclohexyl biphenyls liquid crystal compounds

A technology of cyclohexyl biphenyls, liquid crystal compounds, applied in liquid crystal materials, organic chemistry, chemical instruments and methods, etc., can solve problems such as small dielectric anisotropy value

Inactive Publication Date: 2006-09-06
XIAN MODERN CHEM RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But the dielectric anisotropy value is small

Method used

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  • Cyclohexyl biphenyls liquid crystal compounds
  • Cyclohexyl biphenyls liquid crystal compounds
  • Cyclohexyl biphenyls liquid crystal compounds

Examples

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Embodiment 1

[0034] 1. Preparation of 1-(4-n-pentyl-1-hydroxy-cyclohexyl)-2,3-difluorobenzene

[0035] Under the protection of nitrogen, 57g (0.5mol) of o-difluorobenzene and 500ml of dry tetrahydrofuran were added to a 2000ml four-necked flask, the temperature was cooled to -70°C with liquid nitrogen, and 200ml of 2.5M n-butyllithium n-hexane solution was added dropwise. After the dropwise addition, keep stirring for 3 to 4 hours. Keep the temperature at -70°C and add dropwise 4g (0.5mol) of 4-n-pentylcyclohexanone dissolved in 300ml of dry tetrahydrofuran, and then naturally warm to room temperature after the drop. Pour the reaction product into glacial hydrochloric acid for hydrolysis. The oil layer was separated and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain a yellow oily liquid.

[0036] Using the same method, replace n-4- n-Pentylcyclohexanone, to prepare:

[0037] 1-(4-Ethyl-1-hydroxy-cyclohexyl)-2,3-difluorobenzene; ...

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Abstract

The invention discloses a liquid crystal compound of cyclohexyl diphenyl with a constitutional general formula (I) on the right, in which R standing for linear alkyl with the number of 1-9 of the carbon atom, and Ríõstanding for alkyl with the number of 1-5 of the carbon atom. In order to solve the problem of small negative anisotropic dielectric value of the liquid crystal compound, three fluorin atoms introduced upwards into the benzene ring of the liquid crystal compound of cyclohexyl diphenyl in order to provide a liquid crystal compound not only with a big negative anisotropic dielectric value but also with a high electrical resistivity. The invention is mainly used in the liquid crystal display.

Description

technical field [0001] The invention relates to a cyclohexyl biphenyl liquid crystal compound, which belongs to liquid crystal materials and is mainly used for liquid crystal displays. technical background [0002] Liquid crystal displays have the advantages of flat panels, low power consumption, light weight, and no radiation, and are developing rapidly in the field of information display. With the continuous improvement of saturated chromaticity, response speed, contrast, brightness, etc. and the continuous reduction of cost, LCD TVs have been rapidly popularized. At present, LCD TVs have three display modes: TN-TFT, IPS and VA-TFT. The TN-TFT mode is the earliest widely used display mode, but there are problems such as small viewing angle and slow response speed. IPS mode and VA-TFT mode have the characteristics of wide viewing angle and fast response speed, and are the main display modes of LCD TVs. [0003] Liquid crystal displays use the properties of dielectric ani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/225C09K19/12
Inventor 李建安忠维胡明刚贾林王户生刘建群
Owner XIAN MODERN CHEM RES INST
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