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Liquid crystal compound with 2-fluorophenyl and difluoromethyleneoxy group and its preparation method and application

A difluoromethylene oxide, liquid crystal compound technology, applied in chemical instruments and methods, ether preparation, organic chemistry, etc., can solve problems such as the drop of clearing point

Active Publication Date: 2017-05-24
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is to provide a liquid crystal compound with 2-fluorophenyl and difluoromethyleneoxy groups and its preparation method and application, so as to improve the existing liquid crystal compounds with difluoromethyleneoxy groups Improve the response speed of the liquid crystal mixture due to the problem of the drop in the clearing point of the compound

Method used

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  • Liquid crystal compound with 2-fluorophenyl and difluoromethyleneoxy group and its preparation method and application
  • Liquid crystal compound with 2-fluorophenyl and difluoromethyleneoxy group and its preparation method and application
  • Liquid crystal compound with 2-fluorophenyl and difluoromethyleneoxy group and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] Preparation of liquid crystal compounds shown in formula I-1-1-1, the structural formula is as follows,

[0130]

[0131] The synthetic route is,

[0132]

[0133] Specifically, it includes the following five steps from Step 1-1 to Step 1-5,

[0134] 1-1) Add 0.2mol Dissolve in 100ml tetrahydrofuran for use, add 0.22mol magnesium chips and 100ml tetrahydrofuran to a 500ml three-necked bottle and heat to reflux, add a small amount of the above solution to prepare the Grignard reagent, keep reflux and add dropwise after the reaction is initiated, if it is difficult to initiate the reaction, add iodine Initiated by pellets or ethyl bromide, and refluxed for 1 hour after the addition, to obtain After the Grignard reagent, drop 0.2mol Addition, reflux for 1 hour after addition. The viscous reaction solution was obtained, then poured into 200ml of ice water and 20ml of hydrochloric acid, hydrolyzed under stirring, separated, extracted, washed with water, evaporat...

Embodiment 2

[0140] Preparation of liquid crystal compounds shown in formula I-1-2-1, the structural formula is as follows,

[0141]

[0142] According to the same steps as in Example 1, only the replace with A liquid crystal compound represented by formula I-1-2-1 was obtained.

Embodiment 3

[0144] Preparation of liquid crystal compounds shown in formula I-2-1-1, the structural formula is as follows,

[0145]

[0146] The synthetic route is,

[0147]

[0148] It specifically includes the following four steps from Step 2-1 to Step 2-4,

[0149] 2-1) Add 0.11mol Dissolve in 80ml of toluene, 20mL of ethanol, and 70mL of water, start stirring and add 0.13mol sodium bicarbonate, add 0.4g tetrakis(triphenylphosphine)palladium under nitrogen protection, heat to reflux, stop heating to keep the reaction system under slight reflux, add 50mL dropwise 16.4 g (0.1 mol) of the mixed solution dissolved in ethanol, the reaction solution turned light yellow, and was heated under reflux for 4 hours after the dropwise addition. Cool down to 50°C, pour into 100ml of water, separate the organic layer, extract, wash with water, evaporate the solvent, and recrystallize the obtained product with ethanol to obtain 18.6g of white crystals Yield 80%.

[0150] 2-2) Step 2-1) to o...

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PUM

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Abstract

The invention discloses a liquid crystal compound with a 2-fluorophenyl group and a difluoro methyleneoxy group and a preparing method and application thereof. The compound is shown as the formula I. According to the molecular structure of the compound in the formula I, the liquid crystal compound containing the fluorination 2-fluorophenyl group and the difluoro methyleneoxy (-CF2O-) linking group is high in dielectric anisotropy and has high response speed and a high clearing point more importantly, and the performance is of great significance in liquid crystal compound blending.

Description

technical field [0001] The invention relates to the field of preparation and application of liquid crystal compounds, in particular to a liquid crystal compound with 2-fluorophenyl and difluoromethyleneoxy groups, a preparation method and application thereof. Background technique [0002] At present, the application range of liquid crystal compounds is expanding more and more widely, and it can be applied to various types of displays, electro-optic devices, sensors, and the like. There are various types of liquid crystal compounds used in the above-mentioned display fields, among which nematic liquid crystals are most widely used. Nematic liquid crystals have been used in passive TN, STN matrix displays and systems with TFT active matrix. [0003] For the application field of thin film transistor technology (TFT-LCD), although the market has been huge in recent years and the technology has gradually matured, people's requirements for display technology are also constantly i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/30C09K19/34C09K19/20C09K19/44C07C43/225C07C41/01
Inventor 赵磊孟劲松员国良王瑾张虎波张芳苗
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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