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Liquid crystal compound having dielectric anisotropy, composition thereof and application thereof

A liquid crystal compound, anisotropic technology, applied in the liquid crystal field, can solve problems such as high viscosity, insufficient dielectric constant anisotropy, and lower driving voltage

Active Publication Date: 2017-01-04
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In addition, there is a need for further improvement as follows: (s-3) compounds have very small dielectric constant anisotropy and high viscosity, so liquid crystal display elements cannot be driven by liquid crystal compositions containing these compounds
Moreover, in (s-4) compounds and (s-5) compounds, the dielectric constant anisotropy is not large enough and the viscosity is high, and the compatibility with other liquid crystal compounds is low, so they cannot be used in liquid crystals. The composition contains only a small amount of
In addition, in (s-6) compounds, the optical anisotropy is small and the viscosity is high, so the driving voltage cannot be lowered by the liquid crystal composition containing these compounds.

Method used

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  • Liquid crystal compound having dielectric anisotropy, composition thereof and application thereof
  • Liquid crystal compound having dielectric anisotropy, composition thereof and application thereof
  • Liquid crystal compound having dielectric anisotropy, composition thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] The synthetic route of compound 3CWW is as follows:

[0122]

[0123] Compound A and 2,3-difluorobromobenzene were all from Jiangsu Hecheng New Materials Co., Ltd.

[0124] Its specific preparation process is as follows:

[0125] 1) Synthesis of Compound B

[0126] Add 23.8g of compound A and 250mL of anhydrous THF (tetrahydrofuran) into a 1L three-necked flask, and under nitrogen protection, cool down to -78°C, add 42mL of l n-BuLi n-hexane solution (2.4mol / L) dropwise, after the dropwise addition, Stir at -78°C for 1h, then dropwise add 23g of B(i-BuO) 3 and 80mL of anhydrous TFT, after the dropwise addition, keep stirring at -78°C for 1h, then naturally warm up to room temperature, pour the reaction solution into a mixture of 100mL 5% dilute hydrochloric acid and 200g ice, stir, separate the liquid, and diethyl acetate Ester extracted the water layer, combined the oil layers, evaporated the solvent, added 150mL 90-120°C petroleum ether for slurry, filtered to o...

Embodiment 2

[0134] The synthetic route of compound 3C1OWW is as follows:

[0135]

[0136] Propylcyclohexylmethanol p-toluenesulfonate was from Jiangsu Hecheng New Materials Co., Ltd.

[0137] Its specific preparation process is as follows:

[0138] 1) Synthesis of Compound E

[0139] Add 15.8g of compound D, 19.3g of 2,3-difluorobromobenzene, 120mL of toluene, 60mL of ethanol, 60mL of water, 42.4g of sodium carbonate into a 500mL three-necked flask, and add 0.5g of Pd(PPh 3 ) 4 , heated to reflux for 6h, cooled to room temperature, added 100mL of water, separated the layers, extracted the water layer with 100mL of toluene, combined the oil layer, evaporated the solvent, and purified by column chromatography to obtain 15.4g of white solid compound E, yield: 68.1%, GC>98%.

[0140] 2) Synthesis of Compound F

[0141] Add 15.4g of compound E and 200mL of anhydrous THF into a 500mL three-necked flask, and under nitrogen protection, cool down to -78°C, add 30mL of n-BuLi n-hexane solu...

Embodiment 3

[0149] The synthetic route of compound 3CWWW is as follows:

[0150]

[0151] Its specific preparation process is as follows:

[0152] 1) Synthesis of Compound J

[0153] Add 23.8g of compound A and 250mL of anhydrous THF to a 1L three-necked flask, and under nitrogen protection, cool down to -78°C, add 42mL of n-BuLi n-hexane solution (2.4mol / L) dropwise, after the dropwise addition, -78°C Insulated and stirred for 1h, then added dropwise by 25.4g I 2and 150mL of anhydrous TFT, after the dropwise addition, keep stirring at -78°C for 1h, then naturally warm up to room temperature, pour the reaction solution into a mixture of 100mL 5% dilute hydrochloric acid and 200g of ice, stir, separate the liquid, and diethyl acetate Extract the water layer with ester, combine the oil layers, wash the oil layer with sodium thiosulfate aqueous solution, wash the oil layer with water until neutral, evaporate the solvent, and purify by column chromatography to obtain 25.6g of light yello...

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PUM

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Abstract

The invention discloses a liquid crystal compound having dielectric anisotropy. The structure of the compound is as shown in a formula I. The negative liquid crystal compound has negative dielectric anisotropy with a large absolute value, high reliability and relatively low viscosity, is good in intermiscibility with other liquid crystal components, and can be widely suitable for a liquid crystal display device. A liquid crystal composition comprising the compound can be applied to a liquid crystal display.

Description

technical field [0001] The invention relates to the field of liquid crystals, in particular to a liquid crystal compound with negative dielectric anisotropy, a composition comprising the liquid crystal compound and applications thereof. Background technique [0002] Display elements containing liquid crystal compounds can be widely used in displays of clocks, calculators, word processors, and the like. These display elements utilize optical anisotropy, dielectric anisotropy, and the like of liquid crystal compounds. [0003] Liquid crystal phases include nematic liquid crystal phases, smectic liquid crystal phases, and cholesteric liquid crystal phases, but those using nematic liquid crystal phases are most widely used. Moreover, the display methods include dynamic scattering (DS), alignment deformation (DAP), guest-host (GH), twisted nematic (TN), super twisted nematic (STN), thin film transistor (TFT), vertical alignment (VA), Inverse Electric Switching (IPS), Polymer St...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C25/18C07C17/263C07C43/225C07C41/16C09K19/44G02F1/13
Inventor 韩文明徐爽张文琦严加浩
Owner JIANGSU HECHENG DISPLAY TECHCO
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