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Diphenylacetylene liquid crystal compounds

A liquid crystal compound, diphenylacetylene technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve problems such as small negative dielectric anisotropy, and achieve large negative dielectric anisotropy value and liquid crystal phase range. wide effect

Inactive Publication Date: 2007-03-07
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to solve the defect that the negative dielectric anisotropy of known tolan liquid crystals is relatively small, and to provide a tolan liquid crystal compound with a large negative dielectric anisotropy value

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] Synthesis of 4-{2-[4-(trans-4-ethylcyclohexyl)-2-fluorophenyl]ethyne}-2,3-difluoroanisole

[0036] (1) Synthesis of 4-(trans-4-ethylcyclohexyl)-2-fluoroiodobenzene

[0037] 3-(trans-4-alkylcyclohexyl)fluorobenzene was prepared according to the method disclosed in EP 0194879.

[0038] Put 40g of 3-(trans-4-ethylcyclohexyl)fluorobenzene and 43.5g of potassium tert-butoxide into a dry 1L four-necked flask, add 150mL of dry tetrahydrofuran under nitrogen protection, and cool with liquid nitrogen to - At 80°C, start to add 103mL of 2.25mol / L n-butyllithium n-hexane solution dropwise, and drop it for about 1 hour. After the drop, keep stirring at this temperature for 2.5h, then slowly add a pre-cooled mixed solution of 51.2g of iodine in 100mL of dry tetrahydrofuran dropwise at -85 ~ -90°C, and then naturally warm to room temperature after the drop. Add 100ml of 10% sodium thiosulfate aqueous solution for washing, separate the organic layer, and dry over anhydrous magnesium...

Embodiment 2

[0103] Synthesis of 4-{2-[4-(trans-4-ethylcyclohexyl)-2-fluorophenyl]ethyne}-2,3-difluorotoluene

[0104] (1) Synthesis of 2,3-difluorotoluene

[0105] In a 500mL three-neck flask equipped with a thermometer and a stirrer, add 200ml of dry tetrahydrofuran, 50ml of dry tetramethylethylenediamine, and 23g of o-difluorobenzene. n-Butyl lithium n-hexane solution 100mL, keep warm for 2 hours after dropping. 50 mL of 1,3-dimethylimidazolinone solution dissolved in 28 g of iodomethane was added dropwise, and the temperature was naturally raised to room temperature after the drop was completed. Pour into water, extract with 200ml n-hexane, separate the organic layer and dry it. After distillation, the fraction at 110-115°C was collected to obtain 18 g of colorless liquid with a yield of 70%.

[0106]Use ethyl iodide and n-propane iodide instead of methyl iodide, and use the same method to synthesize 2,3-difluoroethylbenzene and 2,3-difluoro-n-propylbenzene.

[0107] (2) Synthesis ...

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PUM

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Abstract

The invention discloses a diphenylacetylene LCD compound to increase negative dielectric aeolotropic value, which possesses structural formula as formula (I), wherein R is C1-9 straight chain normal paraffin; R' is C1-3 straight chain normal paraffin or alkoxy.

Description

technical field [0001] The invention relates to a tolan liquid crystal compound, which is mainly used in liquid crystal displays. technical background [0002] With the continuous development of liquid crystal display technology, liquid crystal displays not only occupy the vast majority of the desktop display market, but also large-scale flat-panel liquid crystal televisions are also popularized rapidly. Compared with desktop monitors, in order to meet the requirements of high-speed moving pictures, large-size flat-panel LCD TVs must have higher contrast ratios, as wide a viewing angle as possible, and faster response speeds. At present, the display technologies used in LCD TVs mainly include 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 t...

Claims

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Application Information

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IPC IPC(8): C09K19/12G02F1/13
Inventor 胡明刚安忠维杜渭松李建
Owner XIAN MODERN CHEM RES INST
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