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Cyclohexane liquid crystal compound and liquid crystal compound

A technology for liquid crystal compounds and liquid crystal compositions, applied in liquid crystal materials, organic chemistry, chemical instruments and methods, etc., can solve the problems of slow response speed of liquid crystal compositions, unable to fully meet the display requirements of liquid crystal display elements, etc., and improve the response time. , the effect of reducing the rotational viscosity

Active Publication Date: 2014-09-03
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the response speed of the liquid crystal compositions disclosed so far is still slow, which cannot fully meet people's display requirements for liquid crystal display elements.

Method used

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  • Cyclohexane liquid crystal compound and liquid crystal compound
  • Cyclohexane liquid crystal compound and liquid crystal compound
  • Cyclohexane liquid crystal compound and liquid crystal compound

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0065] The preparation method of the liquid crystal compound shown in the formula I-1 is:

[0066]

[0067] Wherein, step A is a SUZUKI coupling reaction, and step B is a catalytic hydrogenation reaction.

[0068] The liquid crystal compounds represented by the formulas I-2 to I-5 can be prepared by selecting corresponding raw materials and referring to the above-mentioned methods.

[0069] The liquid crystal compound represented by the formula I-6 is preferably a liquid crystal compound represented by the formula I-6-1 ~ formula I-6-4:

[0070]

[0071] The preparation method of the liquid crystal compound shown in the formula I-6 is:

[0072]

[0073] Wherein, step a is an α-alkylation reaction; step b is a fluorination reaction, and the fluorinating agent used is diethylaminosulfur trifluoride (DAST).

[0074] A liquid crystal composition with positive dielectric anisotropy, comprising 2-40 parts by mass of the first component, 30-90 parts of the second component...

Embodiment 1

[0094] Preparation of cyclohexane liquid crystal compound Ⅰ-1-1:

[0095] Its synthetic route is:

[0096]

[0097] Concrete preparation process is as follows:

[0098] Step A:

[0099] Add 9.3g (0.05mol) of 4-ethyl-2,3-difluorophenylboronic acid, 11.9g (0.06mol) of 1-bromo-4-propylbenzene, 6.36g (0.06mol) of anhydrous sodium carbonate into a 500ml three-necked flask mol), toluene 100ml, ethanol 75ml and water 75ml, after heating to reflux, add catalyst tetraphenylphosphine palladium 0.25g (0.0002mol), and then keep reflux reaction for 6h; layer; the organic phase is first passed through a silica gel column, and then recrystallized with 2 times of ethanol to obtain 13g white crystals, which are intermediates

[0100] Step B:

[0101] Add 13g (0.05mol) of the above-mentioned intermediate, 2g Raney nickel catalyst, and 200ml ethanol to a 500ml autoclave, pass hydrogen until the pressure of the autoclave is 3.5-4Mpa, and carry out high-pressure hydrogenation reaction a...

Embodiment 2

[0105] Preparation of cyclohexane liquid crystal compounds Ⅰ-1-2~Ⅰ-1-5:

[0106] The same as the preparation method of compound I-1-1 in Example 1, the difference is: the reaction raw materials used are different,

[0107] The raw materials for preparing compound Ⅰ-1-2 are:

[0108] The raw material for preparing compound Ⅰ-1-3 is:

[0109] The raw material for preparing compound Ⅰ-1-4 is:

[0110] The raw material of preparation compound Ⅰ-1-5 is:

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PUM

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Abstract

The invention discloses a cyclohexane liquid crystal compound which has the structure shown as the formula I. The liquid crystal compound is applied to a nematic liquid crystal composition and can be favorably dissolved with other liquid crystal monomers as well as can be used for effectively decreasing the rotary viscosity of the liquid crystal composition and obviously improving the response time of the liquid crystal composition so as to realize the purpose of rapid response. The invention further discloses a positive dielectric anisotropy liquid crystal composition containing the liquid crystal composition shown as the formula I and a negative dielectric anisotropy liquid crystal composition containing the liquid crystal composition shown as the formula I. The two liquid crystal compositions are rapid in response speed and short in response time, thereby being suitable for preparing various display-type liquid crystal displayers and liquid crystal display elements so as to bring good visual experiences to lookers. Thus, the two liquid crystal compositions have wide application prospects and market values.

Description

technical field [0001] The invention relates to a cyclohexane liquid crystal compound for improving liquid crystal response speed and a liquid crystal composition containing the cyclohexane liquid crystal compound, belonging to the technical field of liquid crystal display. Background technique [0002] Because of its special physical, chemical, and optical properties, liquid crystals have been widely used in thin and light display technology since the middle of the 20th century. So far, people have made use of the characteristics of liquid crystal compounds (optical anisotropy Δn, dielectric anisotropy Δε) to produce many liquid crystal display elements, which are used in clocks, calculators, measuring machines, automotive panels, word processors, electronic memos Books, mobile phones, printers, computers, TVs and other fields. There is an inherent liquid crystal phase in the liquid crystal compound used in the above-mentioned liquid crystal display element, and its phase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C23/18C07C43/192C09K19/44C09K19/30C09K19/34
Inventor 王健张兴员国良华瑞茂侯泽峰段雅杰
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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