Liquid crystal compound and liquid crystal composition containing same, and liquid crystal display device
A liquid crystal compound and liquid crystal composition technology, applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of unfavorable construction reaction speed, small use temperature range, high viscosity, etc., and achieve a wide nematic phase temperature range, Effect of Short Response Time, Low Threshold Voltage
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Embodiment 1
[0205] The synthetic route of compound I-1-1 is as follows:
[0206]
[0207] Step 1. Preparation of compounds of formula B-3
[0208] Add 160g of the compound of formula B-1 ((4-ethoxy-2,3-difluorophenyl)boronic acid), 160.5g of the compound of formula B-2 (2-bromo-6-fluorophenol ) and 72g of sodium carbonate, and fully dissolved with 1.2L of a mixed solvent consisting of toluene, ethanol and water (the volume ratio of toluene, ethanol and water is 2:1:1). Under the condition of nitrogen protection, 0.5 g of dichlorodi-tert-butyl-(4-dimethylaminophenyl) phosphine palladium (II) was added, and the mixture was refluxed for 6 h. After the reaction, the reaction solution was cooled, 500 mL of water was added for liquid separation, the aqueous phase was extracted with toluene, the organic phase was combined, and the organic phase was washed with saturated brine until neutral, dried, concentrated, and recrystallized with isopropanol to obtain 182.8 g (purity: 99.35%, Yield: ...
Embodiment 2
[0223] The synthetic route of compound I-3-5-1 is as follows:
[0224]
[0225] Step 1. Preparation of compounds of formula B-8
[0226] In a 3L reaction flask, add 120g of the compound of formula B-7 ((2,3-difluoro-4'-propyl-[1,1'-biphenyl]-4-yl)boronic acid), 160.5g of formula B -2 compound (2-bromo-6-fluorophenol) and 83g of sodium carbonate, and use 1.2L of mixed solvent composed of toluene, ethanol and water (the volume ratio of toluene, ethanol and water is 2:1:1) dissolve. Under the condition of nitrogen protection, 0.5 g of dichlorodi-tert-butyl-(4-dimethylaminophenyl) phosphine palladium (II) was added, and the mixture was refluxed for 6 h. After the reaction is over, cool the reaction solution, add 500mL of water for liquid separation, extract the aqueous phase twice with toluene, combine the organic phases, wash the organic phases with saturated brine until neutral, dry, concentrate, and use a mixture of toluene and ethanol to Solvent (the volume ratio of to...
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