Tetrahydrofuran structure containing liquid crystal compound and preparation method and applications thereof
A compound and liquid crystal medium technology, applied in chemical instruments and methods, liquid crystal materials, organic chemistry, etc., can solve problems such as small dielectric anisotropy, high rotational viscosity, and poor miscibility at low temperature
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Embodiment 1
[0055]
[0056] The synthetic route for preparing compound BYLC-01 is as follows:
[0057]
[0058] Synthesis of step 1-1 compound 2
[0059] Under the protection of nitrogen, add 84.6g of N-isopropylcyclohexylamine and 300ml of tetrahydrofuran into a 2L three-necked flask, add 0.6mol of n-butyl lithium in n-hexane solution dropwise at -30°C, keep the reaction for 0.5h, and cool down to -80°C ℃, add 74.4g compound 1 and 200ml tetrahydrofuran solution dropwise, keep the reaction for 1h, add dropwise 25.8g 2-propyl oxirane, 12.6g anhydrous lithium chloride and 250ml tetrahydrofuran solution, naturally rise to room temperature and react for 12h.
[0060] After conventional post-treatment, chromatographic purification, PE / EA elution, and EtOH recrystallization gave 57.8 g of light yellow solid compound 2, GC: 94.2%, yield: 61%.
[0061] Synthesis of step 1-2 compound 3
[0062] Under nitrogen protection, add 22.8g of sodium borohydride, 63.2g of compound 2, and 500ml of te...
Embodiment 2
[0077] The liquid crystal compounds used in the following compositions were all provided by Beijing Bayi Space-Time Liquid Crystal Technology Co., Ltd. Unless otherwise specified, the contents of each component in the examples represent mass percentages.
[0078] Each performance test parameter abbreviation is as follows among the present invention:
[0079] Δn is optical anisotropy, η is bulk viscosity (mm 2 / s, 20℃), Δε is the dielectric constant anisotropy (20℃, 1000Hz);
[0080] V 10 is the threshold voltage, which is the characteristic voltage when the transmittance changes by 10% (V, 20°C);
[0081] Cp is the clearing point of the liquid crystal composition (°C);
[0082] τ on is the time from 90% transmittance to 10% transmittance when voltage is applied, τ off It is the time to recover from 10% transmittance to 90% transmittance when the voltage is cut off, τ is τ on+ τ off (response time) (ms);
[0083] All optical data are measured at 20°C unless otherwise s...
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