Nematic liquid crystal compound and applications thereof
A liquid crystal compound and compound structure technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of low voltage, fast TFT-LCD response, and low charge retention, and achieve stable properties and mutual solubility. Good, large dielectric anisotropy effect
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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%.
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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