212386-71-5Relevant articles and documents
Synthesis process of 2, 3-difluoro-4-alkoxy phenol
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Paragraph 0034-0036; 0038-0040, (2020/04/06)
The invention discloses a synthesis process of 2, 3-difluoro-4-alkoxy phenol, and belongs to the technical field of organic synthesis. The process comprises the following steps: using 2, 3-difluorophenylalkyl ether as a raw material, carrying out lithiation by use of n-butyllithium under an ultralow temperature condition, reacting with boric acid ester, adding an alkali for quenching to obtain 2,3-difluoro-4-alkoxy benzene borate, oxidizing in the presence of hydrogen peroxide, and performing acidolysis to obtain 2, 3-difluoro-4-alkoxy phenol, so that the purity of the purified product can reach more than 99.95 %, the impurity content is less than 50ppm, and the requirements of electronic-grade products are met. Boric acid and the alkali can form salt, the salt is dissolved in water and subjected to a homogeneous reaction for an oxidation reaction during oxidation in the presence of the hydrogen peroxide, the reaction conditions are mild, impurities are few, the product purity is high, the solvent can be recycled, and industrial production is easy to achieve.
With double-cyclooctane of the liquid crystal compound, preparation method and application thereof
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Paragraph 0149-0151, (2016/10/09)
The invention discloses a liquid crystal compound containing bicyclooctane as well as a preparation method and application thereof. The compound is shown by a formula I. The compound shown by the formula I has good light and thermal stability, high negative dielectric anisotropy, higher clearing point, and good intersolubility with other liquid crystal, and has a simple synthetic route, low cost and good practical value.
A transformer having negative dielectric anisotropy liquid crystal compound monofluoroethylene, and using this liquid crystal display element and a liquid crystal composition
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, (2016/11/17)
A liquid crystal compound having general physical properties necessary for a liquid crystal compound, a high stability to heat, light or the like, a small viscosity, a suitable refractive index anisotropy, a suitable dielectric anisotropy and steep electro-optic characteristics, a wide temperature range of a nematic phase and an excellent compatibility with other liquid crystal compounds, and a liquid crystal compound especially having a wide temperature range of a nematic phase. A compound represented by formula (1). with, for example, R1 and R2 are alkyl having 1 to 10 carbons; A1 is 1,4-cyclohexylene; A2 is 2,3-difluoro-1,4-phenylene; X is fluorine or chlorine; Z1 and Z2 are a single bond; and p and q is 0 or 1.