Liquid crystal compound and composition for improving liquid crystal material environmental suitability
A technology of liquid crystal compounds and liquid crystal compositions, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., which can solve the problems of easy crystallization, low solubility, high melting point, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0104] Example 1:
[0105] Synthesis of 3,4,5-trifluoro-2"-methyl-4"'-pentyl-1,1': 4', 1": 4", 1"'-tetraphenyl
[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 nitrogen protection, add 4-pentylphenylboronic acid (38.4g, 0.2mol) and 2-bromo-5-iodotoluene into a 1L three-necked round bottom flask equipped with mechanical stirring, reflux condenser, thermometer and nitrogen gas pipe. (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. The heating is turned on, the system is raised to an internal temperature of 60°C, and the reaction is kept for 4-6 hours, and the reaction is stopped. Cool to room temperature, stand to sep...
Example Embodiment
[0118] Example 2:
[0119] Synthesis of 2"-chloro-3,4,5-trifluoro-4"'-propyl-1,1': 4', 1": 4", 1"'-tetraphenyl
[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) and 3-chloro-4-bromoiodide into a 1L three-necked round bottom flask equipped with mechanical stirring, reflux condenser, thermometer and nitrogen gas pipe. 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 Add bis(triphenylphosphine)palladium dichloride (1.2 g, 1.7 mmol) and replace with nitrogen three times. Turn on the heating and reflux for 4-6 hours to stop the reaction. After cooling down to room temperature, standing to separate layers, the aqueous phase was extracted with to...
Example Embodiment
[0135] Example 3:
[0136] Synthesis of 2"-chloro-2',3,4,5-tetrafluoro-4"'-propyl-1,1': 4', 1": 4", 1"'-tetraphenyl
[0137] The specific structure is as follows:
[0138]
[0139] Use 4-bromo-2,3',4',5'-tetrafluoro-1,1'-biphenyl instead of 4'-bromo-3,4,5-trifluoro- in step (3) of Example 1 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"'-tetraphenyl.
[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=7.5 Hz), 1.733 to 1.658 (m, 2H), 0.999 to 0.970 (t, 3H, J=7 Hz).
[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 indicate that the synthesized compound is indeed the compound 2"-chloro-2',3,4,5-tetrafluoro-4"'-pro...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap