Negative liquid crystal compound, composition comprising the liquid crystal compound and application thereof
A liquid crystal composition, negative liquid crystal technology, applied in the preparation of organic compounds, liquid crystal materials, organic chemistry, etc., can solve the problems of low response speed, low driving voltage, inability to achieve balance of performance, and inability to meet the requirements at the same time, and achieve easy access to raw materials. Obtained, large optical anisotropy and clearing point, the effect of simple and easy synthesis route
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Embodiment 1
[0074] Compound Ⅰ-A-2 synthetic route is as follows:
[0075]
[0076] Step 1) Synthesis of compound b
[0077] Add zinc chloride and THF to a 500mL three-necked flask, add sodium borohydride in batches, react for 3 hours, drop in the THF solution of compound a (commercially available), reflux for about 3 hours, take a sample, and GC test that the reaction is complete.
[0078] Quenched by adding ice water and dilute hydrochloric acid, extracted with ethyl acetate, washed with water, and distilled off the solvent to obtain 15.59 g of compound b with a yield of 99%.
[0079] The molar ratio of reactants is: zinc chloride: sodium borohydride: compound a=1.5:3:1.
[0080] Step 2) Synthesis of compound d
[0081] Add compound b, p-bromophenol, PPh to the 500mL there-necked flask 3 (Triphenylphosphine), THF (tetrahydrofuran), put DEAD (diethyl azodicarboxylate) solution dissolved in THF into a constant pressure dropping funnel, empty the nitrogen, add dropwise at -20°C, and k...
Embodiment 2
[0090] Through the same reaction as in Example 1, with compound e-1
[0091]
[0092] Replace compound e to obtain compound Ⅰ-A-6
[0093]
[0094] MS m / z: 464 (M + )
[0095] The optical anisotropy, clearing point and dielectric constant anisotropy of the synthesized liquid crystal compound Ⅰ-A-6 were tested, and the extrapolated parameters were: Δn=0.225; Δε=-2.84; Cp (℃)=262.
Embodiment 3
[0097] Through the same reaction as in Example 1, with compound a-1
[0098]
[0099] Substitution of compound a yields compound I-B-2
[0100]
[0101] MS m / z: 442 (M + )
[0102] The optical anisotropy, clearing point and dielectric constant anisotropy of the synthesized liquid crystal compound Ⅰ-B-2 were tested, and the extrapolated parameters were: Δn=0.325; Δε=-3.41; Cp (℃)=258.
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