- Transposition method of 1-cyclohexyl-2,3-difluorobenzene
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The invention discloses a transposition method of a 1-cyclohexyl-2, 3-difluorobenzene compound, and the transposition method takes halogen as a catalyst. The transposition method is particularly suitable for 1-cyclohexyl-2, 3-difluorophenyl ether compounds, in the compounds, halogen existing in the form of a dichloromethane solution is dropwise added to serve as a catalyst, the cis-isomer can be transposed into the trans-isomer, the quite high yield can be provided, and the transposition efficiency can be improved; further, in combination with the recrystallization step, almost 100% of the trans isomer can be provided.
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Paragraph 0061-0069
(2022/01/12)
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- LIQUID CRYSTALLINE COMPOUND, LIQUID CRYSTAL COMPOSITION, AND LIQUID CRYSTAL DISPLAY ELEMENT
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The invention provides a liquid crystal compound having the stability to heat, light or the like, a wide temperature range of a nematic phase, a small viscosity, a large optical anisotropy, a suitable elastic constant K3 3, a large negative dielectric anisotropy and an excellent compatibility with other liquid crystal compounds. The invention also provides a liquid crystal composition including this compound and a liquid crystal display device containing this composition. A liquid crystal compound represented by formula (1-1). For example, R1 and R2 are independently hydrogen, alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons, alkoxy having 1 to 9 carbons, alkoxyalkyl having 2 to 9 carbons or alkenyloxy having 2 to 9 carbons; the ring A1 is trans-1,4-cyclohexylene, 1,4-cyclohexenylene, 1,3-dioxane-2,5-diyl, pyrimidine-2,5-diyl or pyridine-2, 5-diyl; L1 and L2 are independently hydrogen or fluorine, and at least one of them is fluorine; and Z1 , Z2 and Z3 are independently a single bond, -(CH2)2-, -CH=CH-, -C≡C-, -CH2O-, -OCH2-, -COO- or -OCO-.
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Page/Page column 127
(2012/07/30)
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