Alkyl biphenyl end group optomagnetic controllable liquid crystal compound containing Schiff base structure and synthetic method thereof
A technology for alkyl biphenyl end groups and liquid crystal compounds, which is applied to the field of optical and magnetic controllable liquid crystal compounds containing Schiff base structures at the end groups of alkyl biphenyl groups and their synthesis, and can solve the problems of system synthesis and performance research that have not been reported. , to achieve the effect of mild and controllable synthesis process conditions and simple preparation process
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Embodiment 1
[0048] The preparation of the photomagnetic controllable liquid crystal compound containing Schiff base structure at the end of alkyl biphenyl includes the following steps:
[0049] 1) Preparation of 4'-methylbiphenyl-4-carbonyl chloride
[0050] Take 2.12g (0.01mol) of 4'-methylbiphenyl-4-carboxylic acid and 2.38g (0.02mol) of thionyl chloride respectively into the reactor, and then add 1.18g of DMF and 50mL of toluene mixed solvent , And then react at room temperature for 5 hours. After the reaction, the mixed solvent in the reaction solution is removed under reduced pressure to obtain a brown liquid 4'-methylbiphenyl-4-carboxylic acid chloride, which can be directly entered into the next step without purification;
[0051] 2) Preparation of 4'-(4'-(4'-methylphenyl)benzoyloxy)azobenzene-4-carbaldehyde
[0052] Dissolve 2.26g (0.01mol) of 4'-hydroxyazobenzene-4-carbaldehyde in dichloromethane and add it to the reactor, then add 1.8mL of triethylamine; add the 4'-formaldehyde prepared...
Embodiment 2
[0056] Example 2 (see Picture 1-1 , Figure 1-2 )
[0057] 1) Preparation of 4’-ethylbiphenyl-4-carbonyl chloride
[0058] Take 2.40g of 4'-ethylbiphenyl-4-carboxylic acid and 2.38g (0.02mol) of thionyl chloride respectively into the reactor, then add 1.18g of DMF and 50mL of toluene mixed solvent, and then at room temperature React for 5 hours. After the reaction is completed, the mixed solvent in the reaction solution is removed under reduced pressure to obtain 4'-ethylbiphenyl-4-carboxylic acid chloride as a brown liquid, which directly enters the next step without purification;
[0059] 2) Preparation of 4'-(4'-(4'-ethylphenyl)benzoyloxy)azobenzene-4-carbaldehyde
[0060] 2.1) Preparation of p-aminobenzaldehyde
[0061]
[0062] (1) Put 12g of Na 2 S and 12g of NaOH were added to 200mL of water to form a mixed solution, and then filtered; the filtrate was added to a 500mL three-necked flask and stirred and heated to 65°C, then 5.4g of sulfur powder was added, and then continued st...
Embodiment 3
[0074] 1) Preparation of 4’-propylbiphenyl-4-carbonyl chloride
[0075] Take 2.40g (0.01mol) of 4'-propylbiphenyl-4-carboxylic acid and 2.38g (0.02mol) of thionyl chloride respectively into the reactor, and then add 1.18g of DMF and 50mL of toluene mixed solvent , And then react at room temperature for 5 hours. After the reaction is completed, the mixed solvent in the reaction solution is removed under reduced pressure to obtain 4'-propylbiphenyl-4-carboxylic acid chloride as a brown liquid, which directly enters the next step without purification;
[0076] 2) Preparation of 4'-(4'-(4'-propylphenyl)benzoyloxy)azobenzene-4-carbaldehyde
[0077] Dissolve 2.26g (0.01mol) of 4'-hydroxyazobenzene-4-carbaldehyde in dichloromethane and add it to the reactor, then add 1.8mL of triethylamine; add the 4'-propane prepared in step 1) Diphenyl-4-carboxylic acid chloride was dissolved in dichloromethane to prepare a 40mL solution of 4'-propylbiphenyl-4-carboxylic acid chloride in dichloromethane,...
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