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Liquid crystal compound and liquid crystal medium containing same

A liquid crystal compound and compound technology, which is applied in the preparation of organic compounds, liquid crystal materials, organic chemistry, etc., can solve the problems of few types of VA monomer liquid crystals and the inability to meet the development needs of mixed liquid crystals.

Inactive Publication Date: 2015-05-20
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, due to different regions and different ambient temperatures, the requirements for the nematic phase range of mixed liquid crystals will also be different. For example, in regions with high latitude, where the temperature in winter can reach minus 30°C, the mixed liquid crystals are required to work normally at minus 30°C. This requires the crystallization point of mixed liquid crystals to be at least minus 40°C. The existing VA monomer liquid crystals are too small to meet the development needs of mixed liquid crystals. It is necessary to develop more types of negative liquid crystal monomers with excellent performance.

Method used

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  • Liquid crystal compound and liquid crystal medium containing same
  • Liquid crystal compound and liquid crystal medium containing same
  • Liquid crystal compound and liquid crystal medium containing same

Examples

Experimental program
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Effect test

specific Embodiment

[0137] R is for C 1 -C 5 straight chain alkyl, C 1 -C 5 straight-chain alkoxy or C 2 -C 5 straight-chain alkenyl, C 2 -C 5 straight-chain alkenyloxy

[0138] "Conventional work-up" means that, if necessary, water is added, the mixture is extracted with dichloromethane, diethyl ether, methyl tert-butyl ether or toluene, the phases are separated, the organic phase is dried and evaporated, and the product is then distilled under reduced pressure or crystallized and / or Or chromatographic purification.

Embodiment 1

[0140]

[0141] Step 1.1

[0142]

[0143] Add 0.9mol chloromethyl ether triphenylphosphonium salt and 1L tetrahydrofuran to a 2L three-necked flask, stir and cool down to 0°C under nitrogen protection, add 1mol potassium tert-butoxide in batches, control the temperature at 0-10°C, and the reaction solution turns reddish brown. After adding potassium tert-butoxide, stir and react for 2 hours, add dropwise 0.8mol cyclopentanone in 100ml tetrahydrofuran solution, control the temperature below 10°C, stir and react for 3 hours after dropping, hydrolyze, separate liquid, extract the aqueous solution twice with 500ml toluene, and combine , wash with water until neutral. Evaporate the solvent to dryness, and distill at atmospheric pressure to obtain the product 0.67mol, GC: 95% yield 83.8%.

[0144] Step 1.2

[0145]

[0146] Add 0.67mol to 1L three-necked bottle 500mL tetrahydrofuran was cooled to 0°C, 200ml concentrated hydrochloric acid and 100ml aqueous solution we...

Embodiment 2

[0165]

[0166] Step 2.1

[0167]

[0168] Add 0.1mol to 1L three-necked bottle 100mL tetrahydrofuran, stirred under nitrogen protection, cooled to -70°C, added 0.11mol n-butyllithium in batches, controlled temperature -70--80°C, dripped butyllithium, stirred for 2 hours, added dropwise 0.2mol of DMF, Control the temperature below -70°C, stir and react for 3 hours after dripping, hydrolyze, separate liquid, extract the aqueous solution twice with 500ml toluene, combine, wash with water until neutral. Evaporate the solvent to get the product 0.08mol, GC: 98%, yield 80%

[0169] Step 2.2

[0170] Add to 500ml three-neck bottle 0.08mol, 200ml tetrahydrofuran, 50ml water, add potassium borohydride 0.1mo 100ml aqueous solution in batches under stirring, and react at room temperature for 4 hours after adding. Add 300ml of dichloromethane, stir, separate the liquids, wash with 200ml of water, perform column chromatography once, and evaporate the solvent to obtain 0.07...

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Abstract

The invention relates to a negative dielectric liquid crystal compound containing a structural formula I and a liquid crystal medium of at least one compound containing the structural formula I and an electro-optical display containing the type of liquid crystal medium. The compound has high negative dielectric constant, relatively great K value and relatively low rotary viscosity and is suitable for quick-response VA liquid crystal and particularly suitable for VA-TFT and VA-IPS liquid crystal display.

Description

technical field [0001] The invention belongs to the field of liquid crystal compounds and their applications, and relates to a novel cyclopentyl methyl ether negative dielectric anisotropy compound and its preparation method and application, and also relates to a liquid crystal medium containing the compound, which is suitable for passive Or actively drive liquid crystal display technology. Background technique [0002] At present, TFT-LCD has been widely used in industrial fields and household consumption fields, almost completely replacing the traditional CRT display market. According to different liquid crystal display methods, liquid crystal display elements can be divided into twisted nematic (TN) mode, super twisted nematic (STN) mode, in-plane (IPS) mode, vertical alignment (VA) mode and other modes. [0003] Most of the current liquid crystal display elements are twisted nematic (TN) mode, but it has the disadvantages of low contrast and narrow viewing angle, while ...

Claims

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Application Information

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IPC IPC(8): C07C43/225C07C41/30C09K19/30C09K19/44C09K19/46G02F1/1333
CPCC07C43/225C09K19/3066C09K19/44C09K19/46G02F1/1333
Inventor 孟劲松员国良丰景义温刚高红茹
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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