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Conjugated separate liquid crystal compound, and preparation method and application thereof

A compound and reaction technology, applied in the field of conjugated separation liquid crystal compound and its preparation, can solve the problems of low viscosity, isotropic state transition point (clearing point is not high enough, can not meet the needs of liquid crystal materials, etc., to achieve the raw material Easy to obtain, simple synthetic route, large optical anisotropy and clearing point effect

Inactive Publication Date: 2013-01-23
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Using the above-mentioned liquid crystal composition with a negative dielectric anisotropy cannot achieve a sufficiently low viscosity and the isotropic transition point (clearing point) is not high enough in a liquid crystal composition requiring a high response speed such as a liquid crystal TV. Meet the needs of liquid crystal materials for the development of liquid crystal display components

Method used

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  • Conjugated separate liquid crystal compound, and preparation method and application thereof
  • Conjugated separate liquid crystal compound, and preparation method and application thereof
  • Conjugated separate liquid crystal compound, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 Compound I-1-2-1 (R 1 =C 3 H7,R 2 =C 2 h 5 ) preparation

[0049]

[0050] step 1:

[0051] Add 27.2g (4-(4-propylphenyl)cyclohexyl)methanol, 23.7g triethylamine and 400ml dichloromethane into a 1000ml three-necked flask. After cooling down to 0°C, a solution of 26.7g p-toluenesulfonyl chloride in 150ml dichloromethane was added, followed by reaction at room temperature for 3h. The reaction solution was poured into water, extracted with dichloromethane, and the organic layer was washed with water to neutrality, dried with anhydrous sodium sulfate, and then the solvent was removed by rotary evaporation, and recrystallized with ethanol to obtain 29g (4-(4-propyl Phenyl)cyclohexyl)methyl 4-methylbenzenesulfonate.

[0052] Step 2:

[0053] Add 8.4g of 4-ethoxy-2,3-difluorophenol and 60ml of N,N-dimethylformamide into a 500ml three-necked flask, cool down to 0°C, add 1.4g of sodium hydroxide in batches, and raise to 60°C , add dropwise a solution of 15....

Embodiment 2

[0055] Example 2 Compound I-5-2-1 (R 1 =C 3 h 7 , R 2 =C 2 h 5 ) preparation

[0056]

[0057] step 1:

[0058] Add 8g (4'-(4-propylphenyl)-[1,1'-dicyclohexane]-4-yl)methanol, 7.1g triethylamine and 200ml dichloromethane into a 1000ml three-necked flask. After cooling down to 0° C., a solution of 5.7 g of p-toluenesulfonyl chloride in 50 ml of dichloromethane was added, followed by reaction at room temperature for 3 h. The reaction solution was poured into water, extracted with ethyl acetate, and then the organic layer was washed with water to neutrality, dried with anhydrous sodium sulfate, and the solvent was removed by rotary evaporation, and recrystallized with ethanol to obtain 10 g (4'-(4-propane phenyl)-[1,1'-dicyclohexane]-4-yl)methyl 4-methylbenzenesulfonate.

[0059] Step 2:

[0060] Add 4.5g of 4-ethoxy-2,3-difluorophenol and 60ml of N,N-dimethylformamide into a 500ml three-necked flask, cool down to 0°C, add 1.4g of sodium hydroxide in batches, and rais...

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PUM

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Abstract

The invention provides a conjugated separate liquid crystal compound disclosed as a general formula I, and a preparation method and application thereof. In the general formula I, m is a whole number ranging from 1 to 4. Independent conjugated structures are respectively used at the two ends of the molecule to change the design of the past single conjugated system of liquid crystal molecules. Compared with other liquid crystal compounds in the prior art, the liquid crystal compound provided by the invention has large optical anisotropy and clear bright spots. In the liquid crystal compound preparation process, the raw materials are accessible, the synthetic route is simple and easy to implement, and thus, the preparation method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of liquid crystal materials, and provides a conjugated separation type liquid crystal compound and a preparation method and application thereof. Background technique [0002] Liquid crystal display elements can be used in various home appliances represented by clocks and electronic calculators, measuring equipment, automotive panels, word processors, computers, printers, televisions, and the like. As the night scene display method, PC (phase change, phase change), TN (twist nematic, twisted nematic), STN (super twisted nematic, super twisted nematic), ECB (electrically controlled birefringence, electronically controlled birefringence), OCB (optical compensated bend, optically compensated bending), IPS (in-plane switching, coplanar transition), VA (vertical alignment, vertical alignment), CSH (color super homeotropic, color super vertical plane ) and other types. According to the driving method of the component, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/30G02F1/1333C07C41/16C07C43/225
Inventor 宋晓龙李鹏飞
Owner JIANGSU HECHENG DISPLAY TECHCO
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