A liquid crystal compound containing 2,3-difluoro-5-methylphenyl, composition and application thereof

A liquid crystal compound, methyl phenyl technology, applied in the preparation of organic compounds, organic chemistry, liquid crystal materials, etc., can solve the problems of insufficient voltage, TFT-LCD response is not fast enough, charge retention rate is not high enough, etc., to achieve stable performance , broad application prospects, large optical anisotropy effect

Active Publication Date: 2018-07-31
BEIJING BAYI SPACE LCD MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the liquid crystal material itself, TFT-LCD still has many defects such as insufficient response, insufficient voltage, and insufficient charge retention rate.

Method used

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  • A liquid crystal compound containing 2,3-difluoro-5-methylphenyl, composition and application thereof
  • A liquid crystal compound containing 2,3-difluoro-5-methylphenyl, composition and application thereof
  • A liquid crystal compound containing 2,3-difluoro-5-methylphenyl, composition and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1. Liquid crystal compound LC-01 containing 2,3-difluoro-5-methylphenyl unit, the structure is as follows:

[0053]

[0054] 2. Synthesize the compound according to the following routes and steps:

[0055]

[0056] The specific steps are:

[0057] (1) Synthesis of 2,3-difluoro-5-methylbenzeneboronic acid (compound II-7):

[0058] Add 12.8g 3,4-difluorotoluene (0.1mol) and 500ml tetrahydrofuran to a 1L dry and clean three-neck flask, protect with nitrogen, cool down to -75℃~-85℃ with liquid nitrogen, add 40ml butyllithium dropwise, and control Warm reaction for 1 hour, dropwise add 15.6g of trimethyl borate (0.15mol), after dropping, control the temperature at -75°C to -85°C for 30 minutes, then naturally raise the temperature to -20°C, add dropwise 200ml of hydrochloric acid aqueous solution; The phase was extracted twice with 100ml×2 ethyl acetate, the organic phases were combined, and spin-dried to obtain 15.5g of a white solid; the liquid phase purity of the ...

Embodiment 2

[0067] 1. Liquid crystal compound LC-02 containing 2,3-difluoro-5-methylphenyl unit, the structure is as follows:

[0068]

[0069] 2. Synthesize the compound according to the following routes and steps:

[0070]

[0071] The specific steps are:

[0072] (1) Synthesis of 3,4-dimethylphenylboronic acid (compound 2-4):

[0073] Add 18.5g of 3,4-difluorobromobenzene (ie 0.1mol of compound 2-3) and 500ml of tetrahydrofuran into a 1L dry and clean three-necked flask, react with 2.64g of magnesium chips (0.11mol) under nitrogen protection, reflux for 1h, and then cool down To -30-~-40°C, add 16g of trimethyl borate (0.15mol) dropwise, after dropping, raise the temperature to -10°C, then add 200ml of hydrochloric acid aqueous solution dropwise; separate the liquid, and extract the aqueous phase with 100ml×2 ethyl acetate Twice, the organic phase was combined and spin-dried to obtain a white solid; the liquid phase purity of the white solid was 99.0%, the theoretical yield was...

Embodiment 3

[0082] According to the synthesis routes provided in Examples 1 and 2, without substantial adjustments to the preparation steps, only the raw materials were replaced with corresponding groups of raw materials, and the compound with the following structure was synthesized:

[0083]

[0084]

[0085]

[0086]

[0087]

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PUM

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Abstract

The invention relates to a liquid crystal compound containing 2,3-difluoro-5-methyl-phenyl. The compound has a structure shown as a general formula I in the specification. The invention also relates to a preparation method of the liquid crystal compound and a composition containing the liquid crystal compound. The invention relates to an application of the liquid crystal compound and the composition in the fields of liquid crystal display. The liquid crystal compound and the composition have negative dielectric anisotropy, have a stable structure, and have good application prospect.

Description

technical field [0001] The invention relates to the field of liquid crystal display materials, in particular to a liquid crystal compound containing 2,3-difluoro-5-methylphenyl and an application thereof. Background technique [0002] At present, liquid crystals are widely used in the field of information display, and at the same time, some progress has been made in the application in optical communication (S.T.Wu, D.K.Yang. Reflective Liquid Crystal Displays. Wiley, 2001). In recent years, the application fields of liquid crystal compounds have been significantly expanded to various display devices, electro-optic devices, electronic components, sensors, etc. For this reason, many different structures have been proposed, especially in the field of nematic liquid crystals, and nematic liquid crystal compounds have been most widely used in flat panel displays so far. Especially for TFT active matrix systems. [0003] According to the arrangement of liquid crystal molecules, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/12C09K19/30C09K19/44C07C41/30C07C43/225C07C17/263C07C25/18G02F1/1333
Inventor 储士红班全志姜天孟田会强谭小玉高立龙苏学辉陈海光
Owner BEIJING BAYI SPACE LCD MATERIALS TECH
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