Polyfluoric terphenyl liquid crystal compound and synthesis method and use thereof

A technology of polyfluoroterphenyls and liquid crystal compounds, which is applied in the field of compounds, can solve problems such as low driving voltage refractive index dielectric anisotropy, and achieve high optical dielectric anisotropy, high electronegativity, lower melting point and The effect of viscosity

Inactive Publication Date: 2010-07-07
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Liquid crystal display products require that the liquid crystal materials used have a wide temperature range of nematic phase, low driving voltage, suitable refractive index and high dielectric anisotropy, as well as excellent chemical and

Method used

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  • Polyfluoric terphenyl liquid crystal compound and synthesis method and use thereof
  • Polyfluoric terphenyl liquid crystal compound and synthesis method and use thereof
  • Polyfluoric terphenyl liquid crystal compound and synthesis method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] (1) Preparation of intermediate 4-alkyl fluorine-containing iodobenzene

[0019]

[0020] (2) Preparation of intermediate fluorophenylboronic acid

[0021]

[0022] (3) Preparation of intermediate 4-alkyl fluorinated biphenylboronic acid

[0023]

[0024] (4) Synthesis of the target product polyfluoroterphenyl liquid crystal

[0025]

specific Embodiment

[0026] According to the above synthetic route, the liquid crystal compound——4-(4'-(4"-propyl-2",6"-difluorophenyl)-2',6'-difluorophenyl)-2,6 -The concrete processing steps of difluorobenzene trifluoromethoxy ether are as follows:

[0027] A. Synthesis of 3,5-difluoropropylbenzene

[0028] A1. Add 200g of magnesium chips and 300ml of tetrahydrofuran into a 1-liter three-neck flask, heat and stir until reflux. Stirring was stopped, and a small amount of 3,5-difluorobromobenzene was added dropwise. After the reaction was initiated, 135 g of 3,5-difluorobromobenzene was added dropwise while the reflux was maintained, stirred for 1 hour, and cooled to 30°C for use.

[0029] A2. Add 300ml of tetrahydrofuran, 172g of bromopropane, 3.5g of cuprous chloride, and 2.1g of lithium chloride into a 1-liter three-necked flask, drop into the reagent prepared in step A1 under stirring, stir and reflux for 5 hours, and cool down to 30 Hydrochloric acid hydrolysis at ℃, liquid separation, extr...

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PUM

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Abstract

The present invention discloses a polyfluoric terphenyl liquid crystal compound. The structural formula of the compound is as follows: R1 is C1-C8 alkyl, R2 is C1-C8 alkyl, fluoro, trifluoromethyl, trifluoromethoxy; U,V, W, X, Y and Z are fluorine substituent or hydrogen, at least one thereof is fluorine substituent. The synthetic process comprises the steps of preparing an intermediate 4-alkyl iodobenzene containing fluorine, preparing an intermediate phenyloboric acid containing fluorine, preparation an intermediate 4-alkyl biphenyloboric acid containing fluorine, and synthesizing target products of the polyfluoric terphenyl liquid crystal compound. The compound has the features of great dielectric anisotropy (delta e), excellent optical, heat, electrical and chemical stability, can be used for improving properties of the liquid crystal mixture, can be widely applied in TN, HTN, STN, TFT mixed liquid crystal materials, and further can be applied in a liquid crystal display.

Description

technical field [0001] The invention belongs to the category of compounds, and specifically relates to a class of polyfluorinated terphenyl liquid crystal compounds and a synthesis method thereof, and the application in TN, HTN, STN, TFT mixed liquid crystal materials, and further applied in liquid crystal displays. Background technique [0002] Liquid crystal display products require that the liquid crystal materials used have a wide temperature range of nematic phase, low driving voltage, suitable refractive index and high dielectric anisotropy, as well as excellent chemical and optical stability, while the existing single Liquid crystal materials cannot meet the above requirements at the same time, so the usual practice is to use several liquid crystal materials with different properties to achieve the desired purpose. Biphenyl and terphenyl liquid crystals have good properties such as low melting point, low viscosity, high optical anisotropy, and high chemical stability,...

Claims

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Application Information

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IPC IPC(8): C09K19/12C07C43/225C07C41/30
Inventor 王俊军张建立丁兴立田秋锋崔红梅韩耀华
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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