A liquid crystal compound and composition for improving the environmental adaptability of liquid crystal materials
A liquid crystal compound and carbon number technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve problems such as low solubility, high melting point, and easy crystallization, and achieve high birefringence, high absorption capacity, and lower melting point Effect
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Embodiment 1
[0105] Synthesis of 3,4,5-trifluoro-2"-methyl-4"'-pentyl-1,1':4',1":4",1"'-quaterphenyl
[0106] The specific structure is as follows:
[0107]
[0108] The preparation process is as follows:
[0109] Step 1: Synthesis of 4-bromo-3-methyl-4'-pentyl-1,1'-biphenyl
[0110]
[0111] Under the protection of nitrogen, add 4-pentylphenylboronic acid (38.4g, 0.2mol) and 2-bromo-5-iodotoluene successively to a 1L three-neck round-bottomed flask equipped with mechanical stirring, reflux condenser, thermometer, and nitrogen gas guide tube (59.4g, 0.2mol), anhydrous potassium carbonate (82.8g, 0.6mol), tetrabutylammonium bromide (6.4g, 0.02mol), toluene (200mL), ethanol (200mL), water (200mL), and finally Add bis(triphenylphosphine)palladium dichloride (2.1 g, 3 mmol), and replace with nitrogen three times. Turn on the heating, the system rises to an internal temperature of 60°C, keep it warm for 4-6 hours, and then stop the reaction. Cool down to room temperature, let stand to...
Embodiment 2
[0119] Synthesis of 2"-chloro-3,4,5-trifluoro-4"'-propyl-1,1':4',1":4",1"'-quaterphenyl
[0120] The specific structure is as follows:
[0121]
[0122] The preparation process is as follows:
[0123] (1) Synthesis of 4-bromo-3-chloro-4'-propyl-1,1'-biphenyl
[0124]
[0125] Under the protection of nitrogen, add 4-propylphenylboronic acid (27.9g, 0.17mol), 3-chloro-4-bromoiodide in sequence to a 1L three-necked round-bottomed flask equipped with mechanical stirring, reflux condenser, thermometer, and nitrogen gas guide tube. Benzene (54g, 0.17mol), anhydrous potassium carbonate (70.4g, 0.51mol), tetrabutylammonium bromide (5.5g, 0.017mol), toluene (180mL), ethanol (180mL), water (180mL), and finally Bis(triphenylphosphine)palladium dichloride (1.2 g, 1.7 mmol) was added and replaced with nitrogen three times. Turn on the heating, reflux for 4 to 6 hours, and stop the reaction. Cool down to room temperature, stand to separate layers, extract the aqueous phase with to...
Embodiment 3
[0136] Synthesis of 2"-chloro-2',3,4,5-tetrafluoro-4"'-propyl-1,1':4',1":4",1"'-quaterphenyl
[0137] The specific structure is as follows:
[0138]
[0139] 4'-bromo-3,4,5-trifluoro- 1,1'-biphenyl, the target compound 2"-chloro-2', 3,4,5-tetrafluoro-4"'-propyl-1 can be synthesized according to the same method,
[0140] 1': 4', 1": 4", 1"'-quaterphenyl.
[0141] Structural identification data: 1 H NMR (δ, CDCl 3 ): 7.726~7.723(m, 1H), 7.568~7.528(m, 3H), 7.467~7.403(m, 2H), 7.375~7.324(m, 2H), 7.297~7.241(m, 4H), 2.666~2.635 (t, 2H, J=7.5Hz), 1.733~1.658 (m, 2H), 0.999~0.970 (t, 3H, J=7Hz).
[0142] MS (70eV) m / z (%): 456.2 (26.9), 455.3 (22.65), 454.3 (M + , 75.14), 427.2 (35.83), 426.2 (28.87), 425.2 (100), 389.2 (15.31), 212.6 (43.45).
[0143] The above structural identification data show that the synthesized compound is indeed the compound 2"-chloro-2',3,4,5-tetrafluoro-4"'-propyl-1,1':4',1":4" , 1"'-quaterphenyl.
[0144] The phase transition temperature of t...
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