摘要:
Liquid-crystal compounds combining an extremely large negative value of permittivity anisotropy with a small value of optical anisotropy; a liquid-crystal composition containing the same; and a liquid-crystal display element formed from the liquid-crystal composition. The compounds are novel liquid-crystal compounds represented by general formula (1) having a 2,3-difluorophenyl moiety and the liquid-crystal composition contains any of the novel liquid-crystal compounds, while the liquid-crystal display element is formed from this liquid-crystal composition; wherein Ra and Rb each represents linear or branched C1-20 alkyl in which any methylene group may have been replaced with -O-, -CH=CH-, or -C C-, provided that each -O- does not neighbor another -O-; ring A1 represents cyclohexane-1,4-diyl in which any methylene group may have been replaced with -O-; ring A2 represents 2,3-difluoro-1,4-phenylene in which the hydrogen atoms at the 5- and 6-positions each may have been replaced with methyl or a fluorine atom; Z1 and Z2 each represents a single bond or -CH2CH2-; and Xa, Xb, Xc, and Xd each represents a hydrogen, fluorine, or chlorine atom, provided that at least one of them is a fluorine or chlorine atom.
摘要:
Liquid-crystalline compounds which have an extremeley high voltage retention, an extremely small temperature dependence of the retention, a low threshold voltage, and a large value of Δn; a liquid-crystal composition containing any of the liquid-crystal compounds; and a liquid-crystal display element containing the liquid-crystal composition. The compounds are represented by general formula (1), wherein R represents C1-20 alkyl, in which arbitrary non adjacent methylene groups (-CH2-) may have been replaced with oxygen atoms (-O-); Y1 to Y16 each independently represents hydrogen or fluorine, provided at least two of them are fluorine atoms and that at least two hydrogen atoms of each 1,4-phenylene group have not been replaced with fluorine atoms; X represents halogeno or C1-20 alkyl in which arbitrary non adjacent methylene groups may have been replaced with oxygen atoms and any hydrogen has optionally been replaced with fluorine; and Z1, Z2, and Z3 each independently represents -(CH2)2-, -(CH2)4-, -CH2O-, -OCH2-, -(CH2)3O-, -O(CH2)3- or a single bond; and each atom contained in this compound may have been replaced with an isotope thereof; provided when X is -OCF2CF2H, Z1 and Z3 are both single bonds, and Z2 is -(CH2)2-, then none of Y6, Y10, and Y12 is F, and none of Y1 to Y5, Y7 to Y9, Y11, and Y13 to Y16 is H; none of Y2, Y10, and Y12 is F, and none of Y1, Y3 to Y9, Y11, and Y13 to Y16 is H; or none of Y2, Y4, Y10, and Y12 is F and none of Y1, Y3, Y5 to Y9, Y11, and Y13 to Y16 is H.
摘要:
Liquid-crystal compounds useful as the liquid-crystal material for low-voltage driven TFT-type liquid-crystal display devices, which exhibit a high voltage retention and a remarkably high Δε value and are electrically and chemically stable and excellent in compatibility with existing liquid-crystal compounds; liquid-crystal compositions containing the same; and liquid-crystal display devices made by using the same. The above compounds are particular dioxane derivatives of general formula (1), and the above compositions contain at least one of the derivatives.
摘要:
A liquid-crystal compound which exhibits high voltage retention and low threshold voltage, has very small dependency upon the temperature, has a large DELTA n value, and has excellent compatibility with other liquid-crystal materials at low temperatures; a liquid-crystal composition comprising the same; and a liquid-crystal display element made by using the same. The liquid-crystal compound is a terphenyl derivative represented by general formula (1), wherein R represents a straight-chain or branched alkyl group having 1 to 20 carbon atoms and the methylene groups (-CH2-) not adjacent to each other in the alkyl group may be substituted by an oxygen atom; X represents a halogen atom, -OCF3, -OCF2H, -CF3, -CF2H, or -CFH2; Y1, Y2, Y3, Y4, Y5, and Y6 each independently represent H or F, provided that at least two of Y1, Y2, Y3, and Y4 represent fluorine and each atom constituting this compound may be substituted by an isotopic atom.
摘要:
Novel liquid-crystal compounds which have an especially large value of DELTA epsilon and a satisfactory compatibility with other liquid-crystal compounds and show a nematic phase in a wide temperature range without detriment to the properties inherent in liquid-crystal fluorine compounds; a liquid-crystal composition containing the same; and a liquid-crystal display element prepared by using the composition. The compounds include phenyl polyhaloalkyl ether derivatives represented by general formula (1): wherein X and X each independently represents 1,2-ethylene, 1,4-butylene, or a covalent bond, provided that not both represent covalent bonds; R represents C1-20 alkyl in which at least one methylene group may have been replaced with oxygen, vinylene, or ethynylene; Y represents -OCF2CFH-(CF2)n-F (wherein n is 0, 1, 2, or 3) or -OCF2Cl; the rings A and A each independently represents 1,4-cyclohexylene, 1,4-cyclohexenylene, or 1,4-phenylene and A represents 1,4-phenylene, provided that at least one carbon atom in each ring may have been replaced with oxygen or nitrogen and at least one hydrogen atom present on each ring may have been replaced with fluorine or chlorine; m is 0 or 1; and each constituent element of the molecule may contain at least one of the isotopes thereof.
摘要:
A process for highly selectively producing high yields of p-substituted phenols without forming a large amount of a metal-containing waste water, and another process for highly selectively producing a p-substituted cyclohexylphenol having a trans-1,4-disubstituted cyclohexane moiety from a 4-substituted cyclohexanone. The p-substituted phenols are produced by reacting a phenol with a carbonyl compound in the presence of a clayey mineral as the catalyst.
摘要:
Liquid-crystalline compounds which have a significantly large permittivity anisotropy, environmental stability, and excellent compatibility with liquid-crystal compounds; and a liquid-crystal composition and a display element which contain any of the compounds as a component of the liquid-crystal composition and are hence capable of being operated at a low voltage and of high-speed response. The compounds are fluoroalkoxybenzene derivatives represented by general formula (1) wherein A1, A2, and A3 each independently is trans-1,4-cyclohexylene, etc.; B1, B2, and B3 each independently is a single bond, 1,2-ethylene, etc.; R is C1-15 alkyl optionally substituted by halogen; Rf is C1-3 fluoroalkyl; and k, m, and n each independently is 0 or 1; provided that when k=0, then at least one of B1, B2, and B3 is a methyleneoxy bond, etc.; when m+n≥1, then the independence of A1, A2, and A3 is partly limited; and when B1 or/and B2 and B3 each is a single bond, then Rf is limited to part of the fluoroalkyls.
摘要:
A liquid-crystal compound which exhibits high voltage retention and low threshold voltage, has very small dependency upon the temperature, has a large Δn value, and has excellent compatibility with other liquid-crystal materials at low temperatures; a liquid-crystal composition comprising the same; and a liquid-crystal display element made by using the same. The liquid-crystal compound is a substituted benzene derivative represented by general formula (1), wherein R represents a straight-chain or branched alkyl group having 1 to 20 carbon atoms and the methylene groups (-CH2-) not adjacent to each other in the alkyl group may be substituted by an oxygen atom; X represents a halogen atom, -CF3, -CF2H, -CFH2, -OCF3, or -OCF2H; Z1 and Z2 each independently represents -(CH2)2-, -(CH2)4-, -CH2O-, -OCH2-, or a covalent bond, provided that Z1 and Z2 are not simultaneously a covalent bond; and Y1, Y2, Y3, Y4, Y5 and Y6 each independently represents H or F, provided that at least one of Y1, Y2, Y3 and Y4 represents fluorine and each atom constituting this compound may be substituted by an isotopic atom.
摘要:
Novel liquid-crystal compounds which have liquid crystallinity in a wide temperature range, are excellent in compatibility with other liquid-crystal compounds, and are lowly viscous, lowly toxic, and safe; a liquid-crystal composition containing any of the liquid-crystal compounds; and a liquid-crystal display element containing the liquid-crystal composition. The liquid-crystal compounds are cyclohexane derivatives represented by general formula (1), wherein R represents a C2-10 alkylene chain in which an ethylene group (-CH2CH2-) may have been replaced with ethenylene (-CH=CH-) or methyleneoxy (-OCH2-); and M represents COOH or CN.