摘要:
Liquid crystal compositions are provided having a high “higher limit temperature” of a nematic phase, a low “lower limit temperature” of a nematic phase, small viscosity, suitable optical anisotropy, low threshold voltage and large specific resistance. The composition includes at least one compound selected from a group of compounds represented by formula (1) as a first component, at least one compound selected from a group of compounds represented by formula (2) as a second component, at least one compound selected from a group of compounds represented by formula (3) as a third component, and at least one compound selected from a group of compounds represented by formulae (4) and (5) as a fourth component: wherein R1 is alkyl; R2 is alkenyl; R3 is alkyl or alkenyl; A1 and A2 are 1,4-phenylene, for example; Z1, Z2, and Z3 are a single bond, for example; Y1 and Y2 are fluorine, for example.
摘要翻译:提供了向列相的“上限温度”高,向列相的“下限温度”低,粘度小,光学各向异性好,阈值电压低,电阻率大的液晶组合物。 该组合物包含至少一种选自由式(1)表示的化合物作为第一组分的化合物,至少一种选自由式(2)表示的化合物作为第二组分的化合物,至少一种选自 由作为第三成分的由式(3)表示的化合物的组和至少一种选自由式(4)和(5)表示的化合物的组中的化合物作为第四组分:其中R 1, SUP>是烷基; R 2是链烯基; R 3是烷基或链烯基; A< 1>和< 2>是例如1,4-亚苯基; Z 1,Z 2,Z 3和Z 3是例如单键; Y 1和Y 2是例如氟。
摘要:
Provided are polyimide and a thin film thereof which have a three-dimensional structure and therefore are excellent in a mechanical strength and a heat resistance as compared with those of conventional linear polyimide. The polyimide is obtained from a salt of multifunctional amine represented by Formula (1): (wherein A represents a tetravalent organic group, and n represents an integer of 0 to 3) and tetracarboxylic diester represented by Formula (2): (wherein B represents a tetravalent organic group having 1 to 20 carbon atoms, and R1 and R2 each represent independently an alkyl group having 1 to 5 carbon atoms).
摘要:
A liquid crystal composition having a negative dielectric anisotropy, containing at least one compound selected from the group of compounds represented by Formulas (1-1), (1-2), (1-3) and (1-4) as a first component: wherein R5 is alkyl or alkenyl; R2 is alkyl or alkoxy; A5 is 1,4-phenylene or 2-fluoro-1,4-phenylene; and A6 is 1,4-phenylene, 2-fluoro-1,4-phenylene or 2,3-difluoro-1,4-phenylene.
摘要翻译:含有至少一种选自由式(1-1),(1-2),(1-3)和(1-4)表示的化合物的组中的化合物作为第一种的具有负介电各向异性的液晶组合物 组分:其中R 5是烷基或链烯基; R 2是烷基或烷氧基; A 5 S是1,4-亚苯基或2-氟-1,4-亚苯基; 和A 6是1,4-亚苯基,2-氟-1,4-亚苯基或2,3-二氟-1,4-亚苯基。
摘要:
A liquid crystal composition containing at least one compound selected from compounds of formula (1) and formula (2) as a first component, at least one compound selected from compounds of formula (3) as a second component, and at least one compound selected from compounds of formula (4) as a third component: wherein R1 is alkyl; R2 is alkyl or alkenyl; Z1 and Z2 are independently a single bond or —(CH2)2—; X1 is hydrogen or fluorine; and Y1 is fluorine or —OCF3. Also provided is a liquid crystal display element containing the composition.
摘要翻译:含有至少一种选自式(1)和式(2)的化合物的化合物作为第一组分的液晶组合物,至少一种选自作为第二组分的式(3)化合物的化合物和至少一种选自 由式(4)的化合物作为第三组分:其中R 1是烷基; R 2是烷基或链烯基; Z 1和Z 2独立地是单键或 - (CH 2)2 - 。 X 1是氢或氟; 和Y 1是氟或-OCF 3 3。 还提供含有该组合物的液晶显示元件。
摘要:
The present invention provides a liquid crystal composition comprising at least one compound selected from the compounds represented by each of formulas (1) to (5) as set forth in the specification. The invention further provides a liquid crystal display element comprising the composition.
摘要:
The present invention provides a metallocene compound which produces an olefin polymer having a high molecular weight with a high stereoregularity. The metallocene compound has the following formula (1): Q(C5H4-mR1m)(C5H4-nR2n)MXY (1) wherein (C5H4-mR1m) and (C5H4-nR2n) each independently represent a cyclopentadienyl group; C5H4-m and C5H4-n each independently represent a cyclopentadienyl ring; m represents an integer of 1-3; n represents an integer of 2 or 3; R1 and R2 are each independently a substituent bonded respectively to C5H4-m and C5H4-n, and represent a hydrocarbon group of 1-20 carbon atoms, a silicon-containing hydrocarbon group of 1-20 carbon atoms or a heteroaromatic group; each R1m and each R2n may be the same or different; one pair of R2's in the R2n are bonded to each other to form at least one ring; Q represents a divalent group for cross-linking (C5H4-mR1m) and (C5H4-nR2n); M represents a titanium atom, a zirconium atom or a hafnium atom; and X and Y are the same or different and each a hydrogen atom, a halogen atom or a hydrocarbon group.
摘要翻译:本发明提供茂金属化合物,其生产具有高立构规整性的具有高分子量的烯烃聚合物。 金属茂化合物具有下式(1):其中(C5H4-mR1m)和(C5H4-nR_2n)各自独立地表示环戊二烯基; C5H4-m和C5H4-n各自独立地表示环戊二烯基 环; m表示1-3的整数; n表示2或3的整数; R 1和R 2分别独立地表示与C5H4-m和C5H4-n键合的取代基,表示烃基 1-20个碳原子的含硅烃基或杂芳基;每个R 1 m和每个R 2可以相同或不同;一对R 2 R 2相互键合形成至少一个环; Q表示用于交联的二价基团(C 5 H 4 -m R m)和(C 5 H 4 -NR 2 n) M表示钛原子,锆原子或铪原子; X和Y相同或不同,各自为氢原子,卤素原子或烃基。
摘要:
A catalyst for ester production which comprises zirconium oxide, copper, and at least one oxide selected from the group consisting of zinc oxide, chromium oxide, aluminum oxide and silicon oxide, and is obtainable by reducing with hydrogen a catalyst precursor prepared by the reaction of a salt containing at least one of metals constituting the oxides, a zirconium salt and a copper salt with an alkali hydroxide; and a process for producing an ester which comprises bringing either an alcohol or an alcohol and an aldehyde into contact with this catalyst in a gas phase.
摘要:
Metallocene compounds represented by the following general formula (1): YqKLMX2nullnull(1) wherein M, Y, q, L and X are each as defined in the Specification.
摘要:
This invention is to provide a photoprotein which binds with a ligand specific for a substance to be detected at a binding ratio of 1:1 such that the luminescence activity is not reduced by binding with the ligand, a conjugate comprising the luminescent photoprotein and ligand, and a substance detection method which employs the conjugate as a marker. A calcium-binding photoprotein is produced having cysteine residue introduced within the 4th amino acid residue from the amino-terminus. A conjugate is formed by binding a ligand specific for a substance to be detected to the calcium-binding photoprotein, in a binding ratio of 1:1, via the introduced cysteine residue. The conjugate may be utilized as a marker for a substance to be detected.
摘要:
Intermediate compounds, including 2-(t-butyldimethylsilyloxymethyl)-3,4-null(dimethylmethylene)dioxynull-5-hydroxy-tricyclonull5.2.1.02,6nulldec-8-ene, which are useful for the synthesis of neplanocin A having strong antitumor activity. Improved processes for the preparation of neplanocin A, starting from optically active 2-hydroxymethyl-5-hydroxy-tricyclonull5.2.1.02,6nulldeca-3,8-diene and via a key step comprising a retro-Diels-Alder reaction of the above intermediate.