A kind of liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display element
A technology of liquid crystal display element and liquid crystal aligning agent, which is applied in the directions of liquid crystal materials, instruments, chemical instruments and methods, can solve problems such as afterimage, achieve the best display effect, the method is simple, and the effect of avoiding short circuit of liquid crystal display elements
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Synthetic example 1
[0074] The compound represented by structural formula (b-1-1) can be synthesized according to the following synthetic route 1:
[0075] Synthetic route 1
[0076]
[0077] (1) Synthesis of compound b-1-1a
[0078] Drop into 2-nitro-3-hydroxyquinoline (19.2g, 100mmol), potassium carbonate (8.28g, 60mmol) and 400g N,N-dimethylformamide (DMF) in the three-neck round bottom flask of 1000mL, bath The temperature was raised to 70-80°C and stirred for 0.5 hours, and the solution containing 1,5-dibromopentane (9.2g, 40mmol) and 200g N,N-dimethylformamide was slowly dropped into the system, and added dropwise for 0.5 hours Complete, keep the temperature at 70-80°C and continue to react for 3 hours. After the heat preservation is completed, lower the system to room temperature, stop stirring and then suction filter, add 3L water to the filtrate, the system precipitates a solid, and suction filter the resulting suspension. Mixed and stirred for 30 minutes, filtered and dried to obta...
Synthetic example 2-6
[0083] The compounds represented by the structural formulas (b-1-2)-(b-1-6) can be synthesized according to the synthetic route 1 by using 2-nitro-3-hydroxyquinoline and their respective parent dibromo compounds. The specific yield, high-resolution mass spectrometry results and elemental analysis results of each product are shown in Table 1 below. Synthesis examples 4-6 in Table 1, high-resolution mass spectrometry is HPLC-MC, and [M+1] is used to characterize the corresponding compounds The molecular ion peak of:
[0084] Yield, mass spectrum, elemental analysis data of each compound in table 1 synthesis example 2-6
[0085]
Synthetic example 7
[0087] The compound represented by structural formula (b-1-7) can be synthesized according to the following synthetic route 2:
[0088]
[0089] Synthetic route 2
[0090] (1) Synthesis of compound b-1-7a
[0091] Put 2-bromo-3-nitroquinoline (25.31g, 100mmol), potassium hydroxide (6.73g, 120mmol) and 500g tetrahydrofuran into a 1000mL three-neck round bottom flask, heat up to 30-40°C and stir for 0.5 hours, then Add 1,5-pentanediol (4.17g, 40mmol) and 100g tetrahydrofuran solution dropwise into the system, and the dropwise addition is completed in about 0.5 hours, then keep the temperature at 30-40°C and stir for 2 hours. , stop stirring and then filter with suction, add 3L water to the filtrate, the system precipitates solids, filter the resulting suspension with suction, mix the filter cake with 100g of ethanol and stir for 30 minutes, after filtering and drying, you will get 70% yield A yellow solid compound b-1-7a.
[0092] (2) Synthesis of compound b-1-7
[0093] ...
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