Liquid crystal composition with low-temperature storage stability and liquid crystal display device
A liquid crystal composition and compound technology, applied in liquid crystal materials, instruments, nonlinear optics, etc., can solve the problem that liquid crystal media cannot have performance at the same time
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preparation example 1
[0094] The synthetic route of Preparation Example 1 chemical formula (I-1) is as follows:
[0095]
[0096] Its specific process is as follows:
[0097] Among them, compound A and compound B can be synthesized by known methods in the prior art (for the synthesis method, refer to CN100415730C).
[0098] Add 17mmol compound A, 17mmol compound B, 50mL toluene, 25mL ethanol, 25mL water, 68mmol sodium carbonate to a 250mL three-necked flask, add 0.85mmol Pd(PPh 3 ) 4 , continue to reflux under the protection of nitrogen, and react for 6 hours. After the reaction is completed, the reaction solution is post-treated and purified by column chromatography to obtain a white solid I-1, GC ≥ 99%.
[0099] R 1 :CH 3 , to prepare compounds of the following formula:
[0100]
[0101] Yield: 84.5%; DSC: C106.8I; Δn: 0.193; Δε: 24; Cp: 66.6.
[0102] R 1 :C 2 h 5 , to prepare compounds of the following formula:
[0103]
[0104] Yield: 75.5%; DSC: C80I; Δn: 0.166; Δε: 24; Cp:...
preparation example 2
[0111] The synthetic route of preparation example 2 compound (I-2) is as follows:
[0112]
[0113] Its specific process steps are as follows:
[0114] 1) Synthesis of Compound D
[0115] Add 20mmol compound A, 21mmol 3,5-difluorobromobenzene, 50mL toluene, 25mL ethanol, 25mL water, 80mmol sodium carbonate into a 250mL three-necked flask, and add 1mmol Pd(PPh 3 ) 4 , continue to reflux under the protection of nitrogen, and react for 6 hours. After the reaction is completed, the reaction solution is post-treated and purified by column chromatography to obtain a white solid D with a yield of 75% and GC ≥ 98%.
[0116] 2) Synthesis of Compound E
[0117] Add 15mmol compound D and 100mL anhydrous tetrahydrofuran into a 250mL three-necked flask, and cool down to - 78°C, add dropwise 4.4mL n-BuLi solution (2.5mol / L, n-hexane solution), after the dropwise addition, continue to stir at -78°C for 1h, add dropwise 2 Br 2 and 20ml of anhydrous tetrahydrofuran, after the dropwise...
Embodiment 1
[0133]The liquid crystal composition of Example 1 was formulated according to the compounds and weight percentages listed in Table 3, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:
[0134] Table 3 liquid crystal composition formula and test performance thereof
[0135]
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