Ultrahigh-fluorine-substituted liquid crystal compound with CF2O bridge bond, synthetic method and application

A technology for liquid crystal compounds and synthesis methods, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve problems such as increased rotational viscosity, and achieve the effect of simple synthesis methods

Active Publication Date: 2011-08-17
FUJIAN YONGJING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of facts have proved that the tricyclic system often does not appear liquid crystal phase, and the tetracyclic system can appear nematic phase, but the rotational viscosity of the latter is much higher than that of the tricyclic system.

Method used

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  • Ultrahigh-fluorine-substituted liquid crystal compound with CF2O bridge bond, synthetic method and application
  • Ultrahigh-fluorine-substituted liquid crystal compound with CF2O bridge bond, synthetic method and application
  • Ultrahigh-fluorine-substituted liquid crystal compound with CF2O bridge bond, synthetic method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Synthesis of pentafluoroiodobenzene 1

[0033] Put a low temperature thermometer and N in a dry 250mL three-neck flask 2 Import, add dry THF190mL and magnesium chips (3.3g, 0.14mol), feed N 2 After 5 minutes, add pentafluorochlorobenzene (25, 0.125mol) dropwise and stir at room temperature. After 20 minutes, the temperature rises and the solution gradually turns yellow. When the yellow color is more obvious, cool the reaction system to -10°C and keep stirring at this temperature. , the color gradually becomes darker, and the exotherm is no longer obvious after one hour, add iodine (36g, 0.14mol) in batches, control the temperature not to exceed 0°C, continue stirring for half an hour after the addition, when the system turns reddish brown, it means that the reaction is over Add a solution of 30mL concentrated hydrochloric acid and 40mL water, stir for a while, separate the organic phase, extract the inorganic phase with ethyl acetate, wash the organic phase with 10%...

Embodiment 2

[0043] The following is a typical TFT mixture formula (weight percent)

[0044]

[0045] Tcp 95℃, Δn(589nm, 20℃)+0.096, Δε6.0, v 20(mm 2 ,s -1 ) 14.0.

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Abstract

The invention relates to an ultrahigh-fluorine-substituted liquid crystal compound with a CF2O bridge bond, a synthetic method and application, in particular to 1-alkoxy-4-((difluoro(3,4,5-trifluoro-phenoxyl)methylene)-3,5-difluoro phenyl) ethyl)-2,3,5,6-tetrafluorobenzyl and a synthetic method. The compound can be used for preparing a mixed liquid crystal compound.

Description

technical field [0001] The present invention relates to a CF 2 The ultra-high fluorine-containing similar liquid crystal compounds of O bridge bonds can be used as the key components of TFT liquid crystal mixtures with high-speed response and low voltage threshold, specifically a class of 1-alkoxy-4-((difluoro(3, 4,5-Trifluorophenoxy)methylene)-3,5-difluorophenyl)ethyl)-2,3,5,6-tetrafluorobenzene and method of synthesis. Background technique [0002] For the industrial application of liquid crystal flat panel display, liquid crystal molecules must have some specific properties. For example, in order for a display device to be used under various climatic conditions, the molecules must be able to form a stable nematic phase over a very wide temperature range including room temperature. For this reason, liquid crystal molecules must have a low melting point and a high clearing point. In order to achieve a fast response, the molecule must have a low rotational viscosity. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/247C07C41/20C09K19/58
Inventor 闻建勋孙冲秦川田瑞文
Owner FUJIAN YONGJING TECH CO LTD
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