Isothiocyano fluorine-containing quaterphenyl liquid crystal compound and its preparation method, liquid crystal composition and application
A technology for liquid crystal compositions and liquid crystal compounds, applied in chemical instruments and methods, liquid crystal materials, etc., can solve the problems that microwave liquid crystal materials cannot meet, affect the low temperature performance of liquid crystal materials, and the dielectric loss of liquid crystal materials is large, etc. Optical anisotropy, low melting point, effect of reducing dielectric loss
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0056] figure 1 The schematic flow chart of an embodiment of the preparation method of the isothiocyano fluorine-containing quaternyl liquid crystal compound provided by the present invention includes the following steps:
[0057] Step S10: under nitrogen protection, the first reactant, the second reactant, palladium catalyst, K 2 CO 3 , ethanol, toluene and water were subjected to a Suzuki coupling reaction under heating and stirring conditions, and then separated, washed, dried and purified to obtain the first intermediate;
[0058] The first reactant is a compound having the structure shown in the following structural formula (II), and the second reactant is a compound having the structure shown in the following structural formula (III):
[0059]
[0060] Wherein, X in structural formula (II) and (III) 5 and x 6 each independently selected from H atom, F atom, Cl atom or -CH 3 .
[0061] In this step, separation, washing and purification can be carried out accordin...
Embodiment 1
[0099] Example 1 Synthesis of isothiocyanate fluorine-containing quaterphenyl liquid crystal compound 5PGPUS, the structural formula is:
[0100]
[0101] The preparation process is:
[0102](1) Add 20.1g (0.1mol) p-bromophenylboronic acid (the first reactant), 25.5g (0.1mol) of 2, 6-difluoro-4-iodoaniline (the second reactant), 55.2g (0.4mol) of potassium carbonate, then add 150ml of absolute ethanol, 100ml of toluene and 30ml of deionized water; nitrogen replacement 4 times, added under nitrogen protection 0.116g tetrakistriphenylphosphine palladium (0.1% mol ratio), heating, control system temperature 70°C-75°C; stir for 5-6h. TLC tracking and monitoring, after the reaction is complete, stop stirring and heating; the reaction solution is naturally cooled to room temperature, after the reaction solution is filtered by suction, and finally filter out the insoluble matter; the filtrate is extracted three times with 150ml of dichloromethane, and the organic Layer to neutra...
Embodiment 2
[0109] Example 2 Synthesis of isothiocyanate fluorine-containing quaterphenyl liquid crystal compound 4PGPUS, the structural formula is:
[0110]
[0111] The steps are the same as in Example 1, except that the 3-fluoro-4'-pentylbiphenylboronic acid in step (2) is replaced with 3-fluoro-4'-butylbiphenylboronic acid, step (3) The temperature was cooled to 5°C in an ice-water bath, the temperature was naturally raised to 20°C, and then reacted for 0.5h, heated to 50°C and stirred under reflux for 0.5h. Its molecular structure is identified as follows:
[0112] 1 H NMR (400MHz, CDCl 3 )δ7.72(d, J=7.6Hz, 2H), 7.68–7.42(m, 3H), 7.42–7.18(m, 8H), 2.72(t, J=7.7Hz, 2H), 1.84–1.65(m , 2H), 1.56–1.36 (m, 2H), 1.02 (t, J=7.3Hz, 3H).
[0113] 13 C NMR (101MHz, CDCl 3 )δ161.35,158.88,156.99,145.04,142.89, 142.81,140.48,136.88,136.23,130.66,129.68,128.15,126.88,125.74,122.89, 114.37,110.29,109.70,77.41,35.38,33.63,22.48,14.04。
[0114] 19 F NMR (376MHz, CDCl 3 )δ-116.88,-117.50....
PUM
| Property | Measurement | Unit |
|---|---|---|
| melting point | aaaaa | aaaaa |
| melting point | aaaaa | aaaaa |
| isotropization temperature | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More