Liquid crystal aligning agent, liquid crystal display element, polyamide acids, polyimide and compound
A technology of liquid crystal aligning agent and polyamic acid, which is applied in the fields of liquid crystal materials, organic chemistry, chemical instruments and methods, etc., can solve the problems of increasing concentration of aligning agent, analysis of resin composition, poor coating, etc., and achieve excellent printing. sexual effect
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Synthetic example S-1
[0165] According to the following synthetic scheme 1, the compound represented by the above-mentioned formula (A-1) (compound (A-1)) was synthesized.
[0166]
[0167] Synthetic route 1
[0168] In a 3,000mL single-necked flask, mix 186.1g (1.00mol) of 2,4-dinitrofluorobenzene, 152.0g (1.10mol) of potassium carbonate and 1,000mL of dimethyl sulfoxide, and add 148.5mL (1.50mol) ) piperidine, stirred at 80° C. for 1 hour to react. After the reaction, 4,000 mL of ethyl acetate was added to the reaction mixture, and the obtained organic layer was washed four times with 1,000 mL of ion-exchanged water, dehydrated with magnesium sulfate, and filtered to remove magnesium sulfate. The solvent was removed from the filtrate by reducing pressure, and the obtained solid was recrystallized from 500 mL of ethanol to obtain 231.1 g (0.92 mol) of compound (A-1-a).
[0169] Next, under a nitrogen atmosphere, in a 5,000 mL three-necked flask, 226.1 g (0.90 mol) of the compound (A-1-a) obt...
Synthetic example S-2
[0171] According to the following synthetic scheme 2, the compound represented by the above-mentioned formula (A-3) (compound (A-3)) was synthesized.
[0172]
[0173] Synthetic route 2
[0174] In a 3,000 mL single-necked flask, mix 193.7 g (1.50 mol) of isopetidic acid, 186.1 g (1.00 mol) of 2,4-dinitrofluorobenzene, 167.1 g (1.10 mol) of cesium fluoride and 1,000 mL of dimethyl The reaction was carried out with stirring at 25° C. for 12 hours. After completion of the reaction, 3,000 mL of ethyl acetate was added to the reaction mixture, and the resulting organic layer was washed four times with 1,000 mL of ion-exchanged water, dehydrated with magnesium sulfate, and filtered to remove magnesium sulfate. The solvent was removed from the filtrate by reducing pressure, and the obtained solid was recrystallized from 1,000 mL of ethyl acetate to obtain 224.4 g (0.76 mol) of compound (A-3-a).
[0175] Next, under a nitrogen atmosphere, in a 5,000 mL three-necked flask, 221....
Synthetic example S-3
[0177] According to the following Synthetic Scheme 3, the compound represented by the above formula (A-12) (compound (A-12)) was synthesized.
[0178]
[0179] Synthetic route 3
[0180] In a 3,000mL single-necked flask, mix 186.1g (1.00mol) of 2,4-dinitrofluorobenzene, 152.0g (1.10mol) of potassium carbonate, 204.6mL (1.50mol) of 3,5-dimethylpiperidine and 1,000 mL of dimethyl sulfoxide was stirred at 80°C for 5 hours to react. After the reaction, 4,000 mL of ethyl acetate was added to the reaction mixture, and the obtained organic layer was washed four times with 1,000 mL of ion-exchanged water, dehydrated with magnesium sulfate, and filtered to remove magnesium sulfate. The solvent was removed from the filtrate by reducing pressure, and the obtained solid was recrystallized from 500 mL of ethanol to obtain 262.5 g (0.94 mol) of compound (A-12-a).
[0181] Next, under a nitrogen atmosphere, in a 5,000 mL three-necked flask, 251.4 g (0.90 mol) of the compound (A-12-a) ...
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