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Liquid crystal compound and liquid crystal medium comprising compound

A technology of liquid crystal compound and liquid crystal medium, applied in the direction of liquid crystal materials, organic chemistry, chemical instruments and methods, etc., can solve the problems that cannot meet the development needs of mixed liquid crystals, and the types of VA monomer liquid crystals are few

Inactive Publication Date: 2015-05-06
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 comprising compound
  • Liquid crystal compound and liquid crystal medium comprising compound
  • Liquid crystal compound and liquid crystal medium comprising compound

Examples

Experimental program
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specific Embodiment

[0106] R 1 stands 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

[0107] "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

[0109]

[0110] Step 1.1

[0111]

[0112] 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%.

[0113] Step 1.2

[0114]

[0115] Add 0.67mol to 1L three-necked bottle 500mL tetrahydrofuran was cooled to 0°C, 200ml concentrated hydrochloric acid and 100ml aqueous solution wer...

Embodiment 2

[0129]

[0130] Step 2.1

[0131] Add 0.1mol to 1L three-necked bottle 500mLTHF, under the protection of nitrogen, cool down to 0°C, add 0.12mol potassium tert-butoxide in batches, keep T 200ml of THF solution, keep T figure 2

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Abstract

The invention relates to a novel negative dielectricity liquid crystal compound having a structural formula I as shown in the description, relates to a liquid crystal medium comprising at least one compound having the structural formula I and also relates to an electro-optic display containing the liquid crystal medium. The compound has the advantages of high negative dielectricity, larger K value and lower rotational viscosity and is suitable for fast-response VA liquid crystals, especially VA-TFT smf VA-IPS LCD 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 cyclopentylethylene compound with negative dielectric anisotropy and its preparation method and application, and also relates to a liquid crystal medium containing the compound, which is suitable for passive or Active 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 th...

Claims

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Application Information

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IPC IPC(8): C07C43/225C07C25/24C09K19/44C09K19/46
Inventor 孟劲松员国良孟欢王瑾邸玉静张莉王晓娜
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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