Compounds, liquid crystal composition and liquid crystal display
A technology of liquid crystal composition and compound, which is applied in the direction of liquid crystal materials, chemical instruments and methods, organic chemistry, etc., can solve the problems of low clearing point and the inability of liquid crystal displays to be used at high temperatures, so as to increase the working temperature range and improve The effect of clearing the spot and increasing the temperature range
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[0062] Example 1
[0063] The specific compound synthesized is shown in formula P1:
[0064]
[0065] The synthetic route of P1 is as follows:
[0066]
[0067] That is, the compound 3,4-dihydroxy-1-vinylcyclopentane and propylbicyclohexylcarbaldehyde are reacted in toluene to obtain the compound represented by formula P1, and the specific steps are:
[0068] In a 250ml three-necked flask, add 12.8g of 3,4-dihydroxy-1-vinylcyclopentane (prepared with reference to Tetrahedron60 (2004) 8113 8130), 23.6g of propyl dicyclohexylformaldehyde, 100ml of toluene, and heat to 80 degrees. React for 4 hours, cool down, dry with magnesium sulfate, and separate by silica gel column chromatography. The resulting cis-trans mixed substance is recrystallized with a mixed solvent of ethanol and petroleum ether to obtain the trans product, 9.5 g of the compound represented by formula P1, Rate 27.5%, product mass spectrum (m / e): 334, 1 HNMR (500MHz, CDCl3) δ 5.84 (m, 1H), δ 5.01 (m, 1H), δ 4.94 (m, 1H), ...
Example Embodiment
[0069] Example 2
[0070] The specific compound synthesized is shown in formula P3:
[0071]
[0072] The synthetic route of P3 is as follows:
[0073]
[0074] The synthesis method refers to P1, except that propyl dicyclohexyl carboxaldehyde is replaced with propyl phenyl cyclohexyl carboxaldehyde to obtain 6.9 grams of the compound represented by formula P3, product mass spectrum (m / e): 340, 1 HNMR(500MHz, CDCl 3 )δ7.20~7.0(m,4H),δ5.90(m,1H),δ5.01(m,1H),δ4.93(m,1H),δ4.72(d,1H),δ4. 35(m, 2H), δ2.61(t, 2H), δ2.60~2.38(m, 2H), δ2.02(m, 1H), δ1.96~1.55(m, 8H), δ1.41 (m, 2H), δ 1.20 (m, 2H), δ 1.03 (m, 2H), δ 0.94 (t, 3H).
Example Embodiment
[0075] Example 3
[0076] The specific compound synthesized is shown in formula P2:
[0077]
[0078] The synthetic route of P2 is as follows:
[0079]
[0080] That is, the compound 4-propyl-1,2-cyclopentanediol and vinylbicyclohexylformaldehyde are reacted in toluene to obtain the compound represented by formula P2. The specific steps are:
[0081] In a 250ml three-necked flask, add 14.4 grams of 4-propyl-1,2-cyclopentanediol (prepared with reference to European Journal of Medicinal Chemistry 46 (2011) 1263-1273) and 22.0 grams of vinyl dicyclohexyl formaldehyde (prepared with reference to EP1860089) , 100 ml of toluene, heated to 80 degrees for 4 hours, cooled, dried over magnesium sulfate, separated by silica gel column chromatography, the resulting cis-trans mixed substance was recrystallized with a mixed solvent of ethanol and petroleum ether to obtain a trans product, such as The compound represented by formula P2 is 6.1 grams, the yield is 17.6%, the mass spectrum of the prod...
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