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Liquid crystal compound containing dimethylbenzene and difluoro methyleneoxy linking group and preparing method and application thereof

A technology of difluoromethyleneoxy and liquid crystal compounds, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problem of clearing point drop and achieve a wide range of applications

Active Publication Date: 2015-12-09
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 containing dimethylbenzene and difluoromethyleneoxy linking group and its preparation method and application, so as to improve the existing liquid crystal compound with difluoromethyleneoxy The problem of the clearing point drop of the compound exists, and the response speed of the liquid crystal mixture is improved

Method used

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  • Liquid crystal compound containing dimethylbenzene and difluoro methyleneoxy linking group and preparing method and application thereof
  • Liquid crystal compound containing dimethylbenzene and difluoro methyleneoxy linking group and preparing method and application thereof
  • Liquid crystal compound containing dimethylbenzene and difluoro methyleneoxy linking group and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] The liquid crystal mixture shown in the preparation formula I-2-14, the structural formula is as follows,

[0094]

[0095] The synthetic route is,

[0096]

[0097] It specifically includes the following steps a to f in total of six steps,

[0098] a) In an inert atmosphere, 242.4g (2.4mol) of raw materials Dissolve in 1L of tetrahydrofuran, drop the temperature to -30°C and add 960ml of n-butyllithium dropwise, keep stirring for 30 minutes after the dropwise addition, and set aside. In an inert atmosphere, 386g (2mol) Dissolve in 1.5L tetrahydrofuran and cool down to -80°C, then add the prepared lithium diisopropylamide solution dropwise at a constant temperature, keep stirring for 30 minutes after the dropwise addition, keep the temperature and pass carbon dioxide into the reaction system, and react for 1 hour , stop passing carbon dioxide, heat up naturally, pour the reaction solution into a mixture of 1L water and 0.5L concentrated hydrochloric acid, sep...

Embodiment 2

[0105] The liquid crystal mixture shown in the preparation formula I-2-16, the structural formula is as follows,

[0106]

[0107] The synthetic route is,

[0108]

[0109] It specifically includes the following steps a to f in total of six steps,

[0110] a) with reference to Example 1 step a) to obtain

[0111] b) with reference to Example 1 step b) to obtain

[0112] c) with reference to Example 1 step c) to obtain

[0113] d) 176g (1mol) raw material Mix 174g (1mol) m-fluorobromobenzene, 2L toluene, 500ml ethanol, 1.5L water, 159g (1.5mol) sodium carbonate and catalyst 3g tetrakistriphenylphosphine palladium, heat and reflux for SUZUKI reaction for 4 hours, and pour the reaction solution into In 2L water, separate liquid, extract, wash with water, pass through a silica gel column, concentrate, and recrystallize the product with ethanol to obtain 203g product Yield 90%.

[0114] e) the 226g (1mol) product that step d) obtains Dissolve in 2L tetrahydrof...

Embodiment 3

[0117] The liquid crystal mixture shown in the preparation formula I-2-18, the structural formula is as follows,

[0118]

[0119] The synthetic route is,

[0120]

[0121] It specifically includes the following steps a to f in total of six steps,

[0122] a) with reference to Example 1 step a) to obtain

[0123] b) with reference to Example 1 step b) to obtain

[0124] c) with reference to Example 1 step c) to obtain

[0125] d) 190g (1mol) raw material Mix 174g (1mol) m-fluorobromobenzene, 2L toluene, 500ml ethanol, 1.5L water, 159g (1.5mol) sodium carbonate and catalyst 3g tetrakistriphenylphosphine palladium, heat and reflux for SUZUKI reaction for 4 hours, and pour the reaction solution into In 2L water, separate liquid, extract, wash with water, pass through a silica gel column, concentrate, and recrystallize the product with ethanol to obtain 216g product Yield 90%.

[0126] e) the 240g (1mol) product that step d) obtains Dissolve in 2L tetrahydrof...

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Abstract

The invention discloses a liquid crystal compound containing dimethylbenzene and a difluoro methyleneoxy linking 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 dimethylbenzene 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 containing dimethylbenzene and difluoromethyleneoxy linking 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 al...

Claims

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Application Information

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IPC IPC(8): C09K19/30C09K19/20C07C43/225C07C41/30C09K19/44
CPCC09K19/20C09K19/30C09K19/3066C09K19/3402C09K19/44C09K2019/0407C09K2019/0429C09K2019/0466C09K2019/3422
Inventor 张伟孟劲松员国良王瑾张虎波张莉张芳苗
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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