Compound, liquid crystal composition, liquid crystal display element and liquid crystal display
A liquid crystal composition and compound technology, which is applied in liquid crystal materials, chemical instruments and methods, organic chemistry, etc., can solve problems such as complex manufacturing process, affecting production line capacity, and organic pollutant discharge, so as to achieve good mutual solubility and improve production efficiency , High charge retention effect
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[0104] The preparation method of the liquid crystal composition is as follows: put each liquid crystal monomer into a stainless steel beaker after weighing according to a certain proportion, place the stainless steel beaker containing each liquid crystal monomer on a magnetic stirring apparatus to heat and melt, and wait for the liquid crystal monomer in the stainless steel beaker to melt. After most of the liquid crystal monomers are melted, a magnetic rotor is added to the stainless steel beaker, the mixture is stirred evenly, and the liquid crystal composition is obtained after cooling to room temperature.
[0105] The liquid crystal monomer structure of the embodiment of the present invention is represented by a code, and the code representation methods of the liquid crystal ring structure, terminal group, and linking group are shown in the following table (1) and table (2).
[0106] Table (1): Corresponding codes of the ring structure
[0107]
[0108]
[0109] Tabl...
Embodiment 1
[0120]
[0121] step 1
[0122] Add 50 g (0.194 mol) of compound A and 37 g (0.23 mol) of diethyl malonate into 500 ml of acetonitrile, then add 15.5 g (0.194 mol) of pyridine, under nitrogen protection, heat up and reflux for 8 hours. After the reaction is complete, pour the system into ice water, extracted with 1 L of ethyl acetate, concentrated to obtain an oily substance, then added the oily substance into a system of 100ml hydrochloric acid and 200ml water, and raised the temperature to 80°C for 5 hours. After the reaction, pour the system into iced water, A solid was precipitated, and the white solid 1-a was obtained by suction filtration, 48 g in total, with a yield of 82.7%, and its purity was detected by HPLC: 99.2%.
[0123]
[0124] step 2
[0125] Add 30g (0.1mol) of compound 1-a and 10.6g (0.1mol) of compound B into 200ml of dichloromethane, under nitrogen protection, warm to 0°C, add 0.1g (0.01mol) of DMAP, and then add in batches DCC 24.7 g (0.12 mol). ...
Embodiment 2
[0130]
[0131] step 1
[0132]Add 30g (0.12mol) of compound C, 23.3g (0.12mol) of 2-hydroxy-4-bromobenzaldehyde, and 25g (0.18mol) of potassium carbonate into toluene / water / ethanol (300 / 50 / 50v) under nitrogen protection , then add 0.2 g of catalyst, heat up to 80° C., and react for 3 hours. After the reaction was completed, the system was poured into water, extracted with ethyl acetate, dried over sodium sulfate, spin-dried, and recrystallized with ethanol. A white solid 2-a was obtained, totaling 33 g, with a yield of 85%. GC: 98.2%.
[0133]
[0134] step 2
[0135] According to the operation of step 1 in Example 1, compound 2-b was synthesized from compound 2-a to obtain 25 g of white solid, yield 67.5%, HPLC: 98.6%.
[0136]
[0137] step 3
[0138] Add 25g (0.066mol) of compound 2-b into DCM, lower the temperature to 0°C, then add 13.4g (0.13mol) of triethylamine, and dropwise add 6.5g (0.073mol) of acryloyl chloride. Stir at room temperature for 2 hours. ...
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