Nematic liquid crystal compound and applications thereof
A liquid crystal compound and liquid crystal technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of insufficient voltage, insufficient charge retention rate, and insufficient fast response of TFT-LCD, etc., to achieve stable properties, dielectric Large anisotropy and good miscibility
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Embodiment 1
[0039] Synthesis of 5-(4-propylbicyclohexyl)acetyl-1,2,3-trifluorobenzene
[0040]
[0041] Add 0.48 moles of magnesium chips and 200 milliliters of tetrahydrofuran (THF) successively in the there-necked flask, heat to reflux, add dropwise 20 milliliters of 4-propyl bicyclohexyl methyl bromide and 100 milliliters of tetrahydrofuran (THF) to initiate the reaction. Add the remaining solution dropwise at ℃, continue to reflux for 1 hour, and then add dropwise a solution composed of 0.4 moles of 3,4,5-trifluorobenzonitrile and 300 ml of toluene at 70°C, and reflux for 4 hours after the dropwise addition. Add 500 ml of 2M hydrochloric acid to reflux for 2 hours, separate the liquid, wash with water until neutral, evaporate the solvent, and recrystallize with 4 times absolute ethanol to obtain 106.0 g of A1 as a white solid. The gas phase purity is 99.0%.
[0042] Synthesis of 1-(4-propylbicyclohexyl)-2-(3,4,5-trifluorophenyl)propane
[0043]
[0044] Add 0.2 mole of methylt...
Embodiment 2
[0049] 1-(4-Propylcyclohexyl)-2-(4-bromophenyl)propane (B3).
[0050] Synthesis of 1-(4-propylcyclohexyl)-2-(3’,4’,5’-trifluorobiphenyl)propane
[0051]
[0052]Add 0.1 mol of 1-(4-propylcyclohexyl)-2-(4-bromophenyl)propane (B3), 0.12 mol of 3,4,5-trifluorophenylboronic acid, 50 ml of anhydrous Ethanol, 100 ml of toluene and 100 ml of water, start stirring, add 0.24 moles of anhydrous sodium carbonate, heat to 60 ° C and then add 0.05 mmol of tetrakis (triphenylphosphine) palladium, heat and reflux for four hours, cool to 50 ° C, Add 0.4L of toluene and stir for 5 minutes, let stand for 10 minutes, and separate the liquids. The upper layer was the product phase, which was washed three times with 0.2L×3 water, and the solvent was distilled off to obtain a light yellow solid, which was recrystallized twice from absolute ethanol to obtain a white crystal (C1), with a quantity of 32 grams and a gas phase purity of 99.5%.
[0053] Mass spectrometry: 374 (molecular ion peak); ...
Embodiment 3
[0056] Application of liquid crystal compounds containing isopropane bridges in TN, IPS, FFS, ADS-TFT modes:
[0057] The liquid crystal composition was prepared in parts by weight shown in Table 1, and the performance parameters of the liquid crystal composition were shown in Table 1.
[0058] Table 1, parts by weight and performance parameters of each component in the liquid crystal composition
[0059]
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