Alkylbenzene end group optomagnetic controllable liquid crystal compound containing Schiff base structure and preparation method thereof
A technology of liquid crystal compounds and Schiff bases, applied in chemical instruments and methods, liquid crystal materials, organic chemistry, etc., can solve problems such as system synthesis and performance research that have not been reported, and achieve the effects of mild and controllable conditions and simple preparation process.
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Embodiment 1
[0052] The preparation of the photomagnetically controllable liquid crystal compound containing Schiff base structure in the terminal group of alkylbenzene comprises the following steps:
[0053] 1) Preparation of p-toluoyl chloride
[0054] Add 1.36g (0.01mol) of p-toluic acid and 2.38g (0.02mol) of thionyl chloride into the reactor, then add a mixed solution of 1.18g of DMF and 50mL of toluene, and then react at room temperature for 5 hours; The mixed solvent inside was removed under reduced pressure to obtain brown liquid p-toluyl chloride, which directly entered the next step without purification;
[0055] 2) Preparation of 4'-(4'-methylbenzoyloxy)azobenzene-4-carbaldehyde
[0056] 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 acid chloride was dissolved in dichloromethane, prepared into 40mL of a dichloromethane solution of toluoyl chloride, added dropwise under ice-b...
Embodiment 2
[0061] Example 2 (see Picture 1-1 , Figure 1-2 )
[0062] 1) Preparation of p-propylbenzoyl chloride
[0063] Take 1.64g of p-propylbenzoic 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 react at room temperature for 5h. After the reaction The mixed solvent in the reaction solution was removed under reduced pressure to obtain p-propylbenzoyl chloride, which directly entered the next step without purification;
[0064] 2) Preparation of 4'-(4'-alkylbenzoyloxy)azobenzene-4-carbaldehyde
[0065] 2.1) Preparation of p-aminobenzaldehyde
[0066]
[0067] (1) Press 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 25min, deep red Na 2 S x ;
[0068] (2) Add 27...
Embodiment 3
[0079] 1) Preparation of p-ethylbenzoyl chloride
[0080] Add 1.50g (0.01mol) of p-ethylbenzoic acid and 2.38g (0.02mol) of thionyl chloride into the reactor, then add a mixed solution of 1.18g of DMF and 50mL of toluene, and then react at room temperature for 5 hours; The mixed solvent inside was removed under reduced pressure to obtain brown liquid p-ethylbenzoyl chloride, which directly entered the next step without purification;
[0081] 2) Preparation of 4'-(4'-ethylbenzoyloxy)azobenzene-4-carbaldehyde
[0082] Take 2.26g (0.01mol) of 4'-hydroxyazobenzene-4-carbaldehyde and dissolve it in dichloromethane, then add 1.8mL of triethylamine, and then add dropwise 40mL of the product obtained in step 1) under ice-bath conditions The dichloromethane solution of p-ethylbenzoyl chloride was stirred at room temperature for 12 h. After the reaction was completed, the dichloromethane was removed under reduced pressure to obtain an orange solid; the solid was washed with 5% sodium h...
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