High birefringence rate liquid crystal compound and composition thereof
A technology of liquid crystal composition and compound, which is applied in the direction of liquid crystal materials, organic chemistry, chemical instruments and methods, etc., to achieve the effects of improving performance, increasing birefringence, and increasing reflection width
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Embodiment 1
[0076] Synthesis of 3-[2-(4-butylphenyl)-1-ethynyl]dibenzofuran (3-[2-(4-butylphenyl)-1-ethynyl]dibenzofuran)
[0077] The present embodiment is synthesizing the compound shown in following chemical formula (II), and its step system is described in detail as follows:
[0078]
[0079] Under nitrogen, 0.30 g of 3-bromo-dibenzofuran (3-Bromo-dibenzofuran, 1.20 mmol), PdCl 2 (PPh 3 ) 2 7 mg (0.01 mmol), PPh 3 7 mg (0.02 mmol) and CuI 3 mg (0.02 mmol) were placed in a reaction flask, after adding 1.3 g of triethylamine, heated to reflux state, then added 0.21 g of 1-butyl-4-ethynylbenzene ( 1-butyl-4-eth-1-ynylbenzene, 1.26 mmol), reflux for 15 hours, follow the reaction with TLC, filter through Celite after the reaction, concentrate and drain, add ammonium chloride aqueous solution, and extract 3 times with ethyl acetate , washed once with saturated brine, then dried over magnesium sulfate, filtered, concentrated and drained, and then purified with a silica gel column. The...
Embodiment 2
[0082] 3-(2-4{2-[(4-Butylphenyl)-1-ethynyl]-3-methylphenyl}-1-ethynyldibenzofuran
[0083] Synthesis of (3-(2-4{2-[(4-butylphenyl)-1-ethylnyl]-3-methylphenyl}-1-ethynyl)dibenzofuran)
[0084] The present embodiment is synthesizing the compound shown in following chemical formula (IV), and its step is detailed as follows step by step:
[0085]
[0086] Step 1: 4-bromo-1-[2-(4-butylphenyl)-1-ethylnyl]-2-methylbenzene(4-bromo-1[2-(4-butylphenyl)-1-ethynyl]- Synthesis of 2-Methylbenzene
[0087]
[0088] At this stage, the compound (a) shown in the above chemical formula is first synthesized. First, 6.00 grams of 5-bromo-2-iodotoluene (5-bromo-2-iodotolene, 20 mmol), PdCl 2 (PPh 3 ) 2 (0.11 g, 0.16 mmol), PPh 3(0.11 gram, 0.4 mmol and CuI (0.05 gram, 0.24 mmol) are placed in the reaction flask, add triethylamine (20 grams) and heat to reflux state, then 1-butyl-4-ethynylbenzene 3.30 g (1-butyl-4-eth-1-ynylbenzene, 21 mmoles were added, refluxed for 3 hours, the reactio...
Embodiment 3
[0116] Example 3. Measurement of properties of liquid crystal compositions added with compounds of the present invention
[0117] The compound with the structure represented by chemical formula (IV) synthesized in Example 2 was added to a commercially available liquid crystal compound yy066-042, and the addition ratio was compound (IV):yy066-042=0.5:99.5 (weight ratio). The unadded yy066-042 liquid crystal compound had a reflection width of Δn=0.1357 and Δλ=74 nm. After adding the compound of the present invention, the measured reflectance spectrum of the obtained liquid crystal formulation is shown in FIG. 1 , which has Δn=0.285 and reflectance spectrum Δλ=121 nm.
[0118] It can be known that the compound of the present invention is added to the liquid crystal formulation, which can increase the birefringence and reflection wavelength width of the liquid crystal formulation, and is helpful for improving the performance of the liquid crystal display.
[0119] Other implement...
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