Preparation method of cyanopropyne derivative, liquid crystal medium and liquid crystal lens

A liquid crystal lens and derivative technology, applied in the field of liquid crystals, can solve the problems of limiting the development of liquid crystal lenses and low birefringence, achieve good optical and chemical stability, increase birefringence, and low rotational viscosity

Pending Publication Date: 2021-12-10
NANCHANG VIRTUAL REALITY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the birefringence of the liquid crystal medium used in liquid crystal materials for display is generally between 0.08 and 0.25. When this type of liquid crystal material is used in liquid crystal lenses, the birefringence is low, which limits the development of liquid crystal lenses.

Method used

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  • Preparation method of cyanopropyne derivative, liquid crystal medium and liquid crystal lens
  • Preparation method of cyanopropyne derivative, liquid crystal medium and liquid crystal lens
  • Preparation method of cyanopropyne derivative, liquid crystal medium and liquid crystal lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] This example provides a preparation method of propyne cyanide derivatives, and prepares corresponding propyne cyanide derivatives. Specifically, the preparation method includes the following steps:

[0078] Step (1): In a four-necked round-bottomed reaction flask protected by an argon atmosphere, add tetrahydrofuran and triethylamine, start stirring, and then add the compound of general formula I, the compound of general formula II, triphenylphosphine, and oxynitride in sequence copper. Among them, the compound of general formula I is The compound of general formula II is

[0079] And do anaerobic treatment three times to the reaction system, under N 2 Under protection purge, add catalyst Pd(Ph 3 P) 2 Cl 2 , the reaction system was heated up to 40°C, and after 30 minutes of reaction, the reaction system was heated to 60°C, reacted for six hours, stopped the reaction, and cooled to room temperature. At room temperature, the reaction system was suction-filtered,...

Embodiment 2

[0111] The difference between this embodiment and embodiment 1 is that the raw materials input are different, so the products produced in each step are different. Wherein the feeding ratio of each raw material and the preparation method are the same, please refer to the relevant content of Example 1 for details. Specifically, in this embodiment, the compound of general formula I is R is C 5 h 11 -; the compound of general formula Ⅱ is X is H; The compound of general formula III obtained in the step (1) is

[0112] In step (2), the compound of general formula IV of input is where X is F, X 1 for Cl. The compound of general formula V obtained in step (2) is where X 1 The X on the attached benzene ring is F, and the remaining Xs are H.

[0113] The compound of general formula VI obtained in step (3) is The compound of general formula VII obtained in step (4) is.

[0114] The chemical formula of the propargyl cyanide derivative that final step (5) obtains is ...

Embodiment 3

[0119] The difference between this embodiment and embodiment 1 is that: the input raw materials are different, so the products produced in each step are different. Wherein the feeding ratio of each raw material and the preparation method are the same, and details can be referred to the relevant content of Example 1. Specifically, in this embodiment, the compound of general formula I is R is C 3 h 7 -; the compound of general formula Ⅱ is X is F; The compound of general formula III obtained in the step (1) is

[0120] In step (2), the compound of general formula IV of input is where X is H, X 1 for Br. The compound of general formula V obtained in the step (2) is where X 1 The X on the attached benzene ring is H, and the remaining X is F.

[0121] The compound of general formula VI obtained in step (3) is The compound of general formula VII obtained in step (4) is.

[0122] The chemical formula of the propargyl cyanide derivative that final step (5) obtains is...

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PUM

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Abstract

The invention provides a preparation method of a cyanopropyne derivative, wherein the cyanopropyne derivative with relatively high purity can be prepared, and the production cost is relatively low. The cyanopropyne derivative provided by the invention can be applied to preparation of a liquid crystal medium and a liquid crystal lens. The liquid crystal compound provided by the invention has the excellent liquid crystal physical property characteristics of low rotary viscosity, proper spreadwise elastic constant, higher clearing point, proper dielectric anisotropy (delta epsilon), better optical chemical stability and the like. When the cyanopropyne derivative is prepared into a liquid crystal medium or a liquid crystal lens, the driving is easily achieved, focal length can be adjusted to a greater extent, and response time is shortened. The invention further provides a liquid crystal medium and a liquid crystal lens.

Description

technical field [0001] The application belongs to the technical field of liquid crystals, and in particular relates to a preparation method of propynyl cyanide derivatives, a liquid crystal medium and a liquid crystal lens. Background technique [0002] Liquid crystal display is the most widely known display technology at present, and liquid crystal material is the most basic and key material in liquid crystal display and liquid crystal optical applications. Liquid crystal display elements or liquid crystal optical elements use the optical anisotropy and dielectric anisotropy of liquid crystals item heterosexuality to realize its function. The display modes of liquid crystal display devices are: twisted nematic (TN) mode, high twisted nematic (HTN) mode, super twisted nematic (STN) mode, cholesteric bistable state (BTN) mode, electric control Birefringence (ECB) mode, optically compensated bending (OCB) mode, transverse electric field switching (IPS) mode, vertical alignmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/00C07C255/34C07C255/35C09K19/12G02F1/1333G02F1/29
CPCC07C17/266C07C17/263C07F7/0805C07F7/083C07C1/321C07C253/00C07C17/35C09K19/12G02F1/29G02F1/1333C09K2019/122C07C25/24C07C15/50C07C255/34C07C255/35
Inventor 谭志先马锋李建军孙其民郭振民
Owner NANCHANG VIRTUAL REALITY RES INST CO LTD
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