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Negative Dielectric Anisotropic Liquid Crystal Compound, Process For Preparing The Same, And Use Thereof

A liquid crystal compound and anisotropic technology, applied in chemical instruments and methods, liquid crystal materials, etc., can solve problems affecting the usage habits of portable electronic devices, etc.

Inactive Publication Date: 2020-11-27
DAILY XIANHUA OPTOELECTRONICS MATERIALS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of display technology, the functions and applications of liquid crystal displays are becoming more and more diversified, such as portable electronic devices with liquid crystal screens such as smart phones, digital cameras and handheld video games, which are characterized by easy portability, light weight and Small in size, the above-mentioned portable electronic devices are thinner and lighter due to the introduction of liquid crystal displays, which in turn affects the public's habit of using portable electronic devices

Method used

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  • Negative Dielectric Anisotropic Liquid Crystal Compound, Process For Preparing The Same, And Use Thereof
  • Negative Dielectric Anisotropic Liquid Crystal Compound, Process For Preparing The Same, And Use Thereof
  • Negative Dielectric Anisotropic Liquid Crystal Compound, Process For Preparing The Same, And Use Thereof

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preparation example Construction

[0092] The preparation method of the negative dielectric anisotropy liquid crystal compound of the present invention comprises the following steps:

[0093] (1) make contain and X 1 -R 1 -O-R 2 The first mixture reacts to form

[0094] (2) make contains The second mixture of organolithium compound and borate compound is reacted to form

[0095] (3) make contains and a third mixture of oxidizing agents react to form and

[0096] (4) make contains and the fourth mixture of basic compounds react to form a negative dielectric anisotropy liquid crystal compound having a structure of formula I:

[0097] [Formula I]

[0098] Among them, X 1 Indicates halogen. R 1 , R 2 , R 3 , n and The definition of is as described above, and will not be repeated here.

[0099] In the step (1), the first mixture further includes a first solvent and an alkaline reagent. The first solvent is such as but not limited to polar aprotic solvents such as acetonitrile, dimethylf...

Embodiment 1

[0106] [Example 1] The negative dielectric anisotropy liquid crystal compound of formula I-1-a

[0107] The synthesis path of the negative dielectric anisotropy liquid crystal compound of formula I-1-a is:

[0108]

[0109] The detailed synthesis steps of the negative dielectric anisotropy liquid crystal compound of formula I-1-a are as follows:

[0110]1. Synthesis of compound 1: 26g of 2,3-difluorophenol, 30g of 2-bromoethyl methyl ether, 31g of potassium carbonate and 200ml of acetonitrile were mixed to obtain a first mixture. The first mixture was heated to 70°C with stirring and reflux for 8 hours to obtain a crude product. The acetonitrile in the crude product was evaporated to dryness by atmospheric distillation, added to 200 ml of toluene, and then washed four times with deionized water to obtain 38 g of compound 1.

[0111] 2. Synthesis of compound 2: first dissolve 38g of compound 1 in 300ml of tetrahydrofuran (THF) and cool to -78°C, then mix with 88ml of n-but...

Embodiment 2

[0114] [embodiment 2] the negative dielectric anisotropy liquid crystal compound of formula I-2-a

[0115] The synthetic route of the negative dielectric anisotropy liquid crystal compound of formula I-2-a is:

[0116]

[0117] The detailed synthesis steps of the negative dielectric anisotropy liquid crystal compound of formula I-2-a are as follows:

[0118] 1. The synthesis method of compound 3 is as described above, and will not be repeated here.

[0119] 2. Synthesis of formula I-2-a: 32 g of compound 3, 35.8 g of p-propyl benzyl alcohol, 24.8 g of potassium carbonate and 200 ml of acetonitrile were mixed to obtain a mixture. The mixture was heated to 70°C, stirred and refluxed for 8 hours to obtain a crude product. The acetonitrile in the crude product was evaporated to dryness by atmospheric distillation, added to 200 ml of toluene, and then washed four times with deionized water to obtain a solid. The solid was recrystallized twice from ethanol to obtain 36 g of a ...

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Abstract

The invention discloses a negative dielectric anisotropy liquid crystal compound, a preparation method thereof, a negative dielectric anisotropy liquid crystal composition containing the negative dielectric anisotropy liquid crystal compound and a liquid crystal display. The negative dielectric anisotropy liquid crystal compound has a structure shown in a formula I, and the definition of each substituent of the formula I is defined in the specification and claims. The negative dielectric anisotropy liquid crystal compound has higher negative dielectric anisotropy through the design of the overall structure, then the negative dielectric anisotropy liquid crystal composition has higher negative dielectric anisotropy, the driving voltage of the liquid crystal display is small, and therefore power consumption is low. The negative dielectric anisotropy liquid crystal compound has a proper clearing point and proper optical anisotropy.

Description

technical field [0001] The present invention relates to a liquid crystal compound, in particular to a liquid crystal compound with negative dielectric anisotropy, its preparation method and its application. Background technique [0002] With the development of display technology, the functions and applications of liquid crystal displays are becoming more and more diversified, such as portable electronic devices with liquid crystal screens such as smart phones, digital cameras and handheld video games, which are characterized by easy portability, light weight and Due to the small size, the aforementioned portable electronic devices have become thinner and lighter due to the introduction of liquid crystal displays, which in turn affects the public's habit of using portable electronic devices. [0003] At present, the technology of TFT-LCD products is relatively mature, but the requirements for display technology of various panel manufacturers are still constantly improving. A...

Claims

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Application Information

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IPC IPC(8): C09K19/30C09K19/20
CPCC09K19/3066C09K19/3003C09K19/20C09K2019/3009C09K2019/3004C09K2019/3027C09K2019/301C09K2019/3016C09K2019/0444
Inventor 蔡宗佑罗淑玲曾孟云栾兆昌丰佩川
Owner DAILY XIANHUA OPTOELECTRONICS MATERIALS CO LTD
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