Alkyl biphenyl end group optomagnetic controllable liquid crystal compound containing Schiff base structure and synthetic method thereof
A technology for alkyl biphenyl terminal groups and liquid crystal compounds, which is applied in the field of optomagnetically controllable liquid crystal compounds containing Schiff base structures in alkyl biphenyl terminal groups and its synthesis, and can solve problems such as 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 optomagnetically controllable liquid crystal compound containing Schiff base structure in the terminal group of alkyl biphenyl comprises the following steps:
[0049] 1) Preparation of 4'-methylbiphenyl-4-formyl chloride
[0050] Take 2.12g (0.01mol) of 4'-methylbiphenyl-4-carboxylic acid and 2.38g (0.02mol) of thionyl chloride respectively in the reactor, and then add a mixed solvent of 1.18g of DMF and 50mL of toluene , and then reacted at room temperature for 5 hours. After the reaction, the mixed solvent in the reaction solution was removed under reduced pressure to obtain a brown liquid 4'-methylbiphenyl-4-formyl chloride, which was directly entered into the next step without purification;
[0051] 2) Preparation of 4'-(4'-(4'-methylphenyl)benzoyloxy)azobenzene-4-carbaldehyde
[0052] Take 2.26g (0.01mol) of 4'-hydroxyazobenzene-4-carbaldehyde dissolved in dichloromethane and add to the reactor, then add 1.8mL of triethylamine; Dissolve met...
Embodiment 2
[0056] Embodiment 2 (see Figure 1-1, Figure 1-2 )
[0057] 1) Preparation of 4'-ethylbiphenyl-4-formyl chloride
[0058] Take 2.40g of 4'-ethylbiphenyl-4-carboxylic acid and 2.38g (0.02mol) of thionyl chloride respectively in the reactor, then add a mixed solvent of 1.18g of DMF and 50mL of toluene, and then After the reaction was completed, the mixed solvent in the reaction solution was removed under reduced pressure to obtain a brown liquid 4'-ethylbiphenyl-4-formyl chloride, which was directly entered into 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) Add 12g of Na 2 Add S and 12g of NaOH to 200mL water to form a mixed solution, then filter; add the filtrate to a 500mL three-necked flask, stir and heat to 65°C, then add 5.4g of sulfur powder, then continue stirring, heat up to 100°C through an oil bath, and then boil 25...
Embodiment 3
[0074] 1) Preparation of 4'-propylbiphenyl-4-formyl chloride
[0075] Take 2.40g (0.01mol) of 4'-propylbiphenyl-4-carboxylic acid and 2.38g (0.02mol) of thionyl chloride respectively in the reactor, and then add a mixed solvent of 1.18g of DMF and 50mL of toluene , and then reacted at room temperature for 5 hours. After the reaction, the mixed solvent in the reaction solution was removed under reduced pressure to obtain a brown liquid 4'-propylbiphenyl-4-formyl chloride, which was directly proceeded to the next step without purification;
[0076] 2) Preparation of 4'-(4'-(4'-propylphenyl)benzoyloxy)azobenzene-4-carbaldehyde
[0077] Take 2.26g (0.01mol) of 4'-hydroxyazobenzene-4-carbaldehyde dissolved in dichloromethane and add to the reactor, then add 1.8mL of triethylamine; the 4'-propane prepared in step 1) Propylbiphenyl-4-formyl chloride was dissolved in dichloromethane to prepare 40mL of 4'-propylbiphenyl-4-formyl chloride in dichloromethane solution, which was added dr...
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