摘要:
A novel liquid crystalline compound having a large dielectric anisotropy value, a small change in the threshold voltage depending upon temperatures, and an improved solubility in other liquid crystal materials at low temperatures, and a liquid crystal composition containing the compound are provided, which liquid crystalline compound is expressed by the formula (1) wherein R is H or an alkyl group of 1 to 10C; ℓ is an integer of 1 to 9; m, n and o are each independently 0 or 1; A 1 , A 2 and A 3 are each independently trans-1,4-cyclohexylene group, 1,4-pheylene group, one or more H atoms on the ring of which group may be replaced by F, or the like group; Z 1 , Z 2 and Z 3 are each independently -COO-, etc., but at least one member of them is -COO-; X is CF 3 ,etc.; and Y 1 and Y 2 are each independently H or F.
摘要:
There is provided a liquid crystal composition in particular with a low threshold voltage and a wide range of nematic phase temperature (with high TNI point and low TC), while satisfying various properties required for liquid crystal compositions for active matrix type liquid crystal display elements containing compounds represented by general formulas (1-1) and (2-1): where each R 1 independently represents an alkyl group having 1 to 10 carbon atoms; X 1 represents H or F; and each X 2 independently represents F, OCF 3 , CF 3 , or OCF 2 H.
摘要:
A liquid crystal composition is disclosed which contains, as the first component, at least one compound expressed by any one of the formulas (1-1) to (1-3) and contains, as the second component, at least one compound expressed by any one of the formulas (2-1) to (2-7) each of the formulas is recited in the specification. According to the present invention, a liquid crystal composition which particularly has a small V th, is excellent in compatibility at low temperatures, and has a large nematic phase range can be provided while satisfying several characteristics required for liquid crystal compositions for AM-LCD.
摘要:
There are provided a novel compound having a quite high voltage holding ratio, low threshold voltage, quite low temperature-dependency, large Δ ε and superior compatibility with various liquid crystal materials even at a low temperature, as well as a liquid crystal composition and a liquid crystal display element obtained by using 3-fluoro-4-(1,1,2,2-tetrafluoroethoxy)phenyl = 4-(trans-4-propylcyclohexyl)benzoate is used for a liquid crystal composition and in a liquid crystal display element.
摘要:
A novel process for producing a biaryl compound represented by formula (III), which is useful as a medicine, an agricultural chemical and an electrooptical liquid-crystal display material:
Ar-Ar' (III)
(wherein Ar and Ar' each independently represents a substituted or unsubstituted aromatic group) which comprises the steps of (i) reacting a trialkoxysilyl-substituted aromatic compound represented by formula (I):
Ar-Si(OR) 3 (I)
(wherein Ar has the same meaning as defined above and R represents an alkyl group having from 1 to 5 carbon atoms) with a fluoride ion source in the presence of a solvent, and then (ii) adding thereto an aromatic compound represented by formula (II):
X-Ar' (II)
(wherein X represents an eliminating group and Ar' has the same meaning as defined above) and a catalyst comprising a transition metal of tenth group to conduct a further reaction.
摘要:
A liquid crystal composition is disclosed which contains, as the first component, at least one compound expressed by any one of the formulas (1-1) to (1-3) and contains, as the second component, at least one compound expressed by any one of the formulas (2-1) to (2-7) each of the formulas is recited in the specification. According to the present invention, a liquid crystal composition which particularly has a small V th, is excellent in compatibility at low temperatures, and has a large nematic phase range can be provided while satisfying several characteristics required for liquid crystal compositions for AM-LCD.