Fluorine-containing liquid crystal compound
A technology for liquid crystal compounds and specific structures, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problem of high melting point of compounds, and achieve the effects of reducing melting enthalpy, improving compatibility, and large dielectric anisotropy
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Embodiment 1
[0044] 4'-[Difluoro(3,4,5-trifluorophenoxy)methyl]-2,3',5'-trifluoro-4-[2-(trans-4-n-propylcyclohexyl ) Preparation of ethyl] biphenyl:
[0045] The specific structural formula is as follows:
[0046]
[0047] The preparation process is as follows:
[0048] Step 1: Synthesis of Diethyl (3-fluorobenzyl)phosphonate
[0049]
[0050] Add 498 g of triethyl phosphite and 290 g of m-fluorochlorobenzyl into a 1000 mL three-necked flask, stir and heat under reflux for 7 hours. Then the excess triethyl phosphite was distilled off to obtain 472 g of a colorless transparent liquid with a yield of 95.9%.
[0051] Step 2: Synthesis of 1-fluoro-3-[2-(trans-4-n-propylcyclohexyl)vinyl]benzene
[0052]
[0053]Under the protection of nitrogen, add 185.6g (0.8mol) (3-fluorobenzyl) diethyl phosphonate and 200mL tetrahydrofuran to a 1000mL three-necked flask, add 134.4g (1.2mol) potassium tert-butoxide, after the addition is completed, the Incubate at ~30°C for 1 hour. After the he...
Embodiment 2
[0074] Using trans-4-ethylcyclohexylcarbaldehyde instead of trans-4-n-propylcyclohexylcarbaldehyde in Example 1, the same method was used to synthesize 4'-[difluoro(3,4,5-trifluorobenzene oxy)methyl]-2,3',5'-trifluoro-4-[2-(trans-4-ethylcyclohexyl)ethyl]biphenyl.
[0075] Structure Identification:
[0076] 1 H NMR (δ, CDCl 3 ): 0.831~0.992 (m, 7H), 1.067~1.102 (m, 1H), 1.181~1.244 (m, 3H), 1.506~1.552 (m, 2H), 1.754~1.812 (m, 4H), 2.665 (t , 2H, J=8Hz), 6.973~7.071 (m, 4H), 7.203 (d, 2H, J=11Hz), 7.320 (t, 1H, J=8Hz).
[0077] MS (70eV) m / z (%): 395 (100), 270 (38).
[0078] Where m / z=395, the corresponding cracked fragment structure is:
[0079]
[0080] Among them, m / z=270 is the fragment that is further cracked by the fragment of m / z=395, and the corresponding cracked fragment structure is:
[0081]
[0082] The above structural identification data show that the synthesized compound is indeed 4′-[difluoro(3,4,5trifluorophenoxy)methyl]-2,3′,5′-trifluoro-4-[2- (4...
Embodiment 3
[0084] Using trans-4-butylcyclohexylcarbaldehyde to replace trans-4-n-propylcyclohexylcarbaldehyde in Example 1, the same method was used to synthesize 4'-[difluoro(3,4,5-trifluorophenoxy ) methyl]-2,3',5'-trifluoro-4-[2-(trans-4-butylcyclohexyl)ethyl]biphenyl.
[0085] Structure Identification:
[0086] 1 H NMR (δ, CDCl 3 ):0.832~1.036 (m, 7H), 1.131~1.325 (m, 8H), 1.501~1.548 (m, 2H), 1.721~1.811 (m, 4H), 2.672 (t, 2H, J=8Hz), 6.961 ~7.082 (m, 4H), 7.202 (d, 2H, J=11Hz), 7.318 (t, 1H, J=8Hz).
[0087] MS (70eV) m / z (%): 423 (100), 270 (41).
[0088] Where m / z=423, the corresponding cracked fragment structure is:
[0089]
[0090] Among them, m / z=270 is the fragment that is further cracked by the fragment of m / z=395, and the corresponding cracked fragment structure is:
[0091]
[0092] The above structural identification data show that the synthesized compound is indeed 4′-[difluoro(3,4,5-trifluorophenoxy)methyl]-2,3′,5′-trifluoro-4-[2 -(trans-4-butylcyclohexyl)...
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