摘要:
Liquid crystalline compounds having a wide temperature range of liquid crystal phase, low viscosity, chemical stability, and excellent mutual solubility with other liquid crystal materials; liquid crystal compositions comprising the liquid crystalline compound; and liquid crystal display devices comprising the liquid crystal composition are provided; the liquid crystalline compound is expressed by the general formula (1)
Ra-A 1 -Z 1 -A 2 -Z 2 -A 3 -Z 3 -A 4 -Rb (1)
wherein Ra represents an alkenyl group having 2 to 20 carbon atoms or an alkyl group having 1 to 20 carbon atoms any methylene group (-CH 2 -) in the alkenylene or alkyl group may be replaced by -O-, -S-, -CO-, -CH=CH-, or -C≡C-, but in no case -O- and/or -S- continues, and any hydrogen atom in Ra may be replaced by a halogen atom; Rb represents Ra, a halogen atom, or cyano group provided that at least one of Ra and Rb represents a group having double bond; A 1 , A 2 , A 3 , and A 4 independently represent trans-1,4-cyclohexylene group, 1,4-phenylene group any hydrogen atom on the ring may be replaced by fluorine atom or cyano group, cyclohexenediyl group, pyridine-2,5-diyl group, pyrimidine-2,5-diyl group, or 1,3-dioxane-2,5-diyl group; and Z 1 , Z 2 , and Z 3 independently represent an alkenylene group having 2 to 4 carbon atoms, -(CH 2 ) 2 -, -COO-, -OCO-, -C≡C-, -CH 2 O-, -OCH 2 -, or single bond any hydrogen atom in the groups may be replaced by a halogen atom provided that at least one of Z 1 , Z 2 , and Z 3 represents an alkenylene group having 2 to 4 carbon atoms.
摘要:
A novel liquid crystal compound having an intermediate group of a cis-1,4-substituted 2-butenyl group, low viscosity and a broad mesomorphic temperature range is provided, which compound is expressed by the following formula:
wherein R 1 represents an alkyl group of 1 to 10 carbon atoms; n represents 1 or 2, X represents a hydrogen atom, an alkyl group, a halogen atom, a cyano group, an alkoxy group, a methyl group substituted by 1 to 3 halogen atom(s) or a trihaloalkoxy group, Y and Y' each independently represents a hydrogen atom, a halogen atom.
摘要:
An organic electroluminescent element comprising a dimeric stryryl compound represented by general formula (I) as the luminescent material, wherein D, D', E, E', F, F', G, G' and Q are each as defined in the specification. The dimeric styryl compound used is one prepared by bonding two molecules of a compound having a good luminescence efficiency and a desirable luminescence wavelength to each other via a divalent group which breaks a conjugated system without impairing the abilities of the compound to thereby increase the molecular weight (to dimerize) and improve the properties as thin film. Therefore this element is widely applicable as various display materials.
摘要:
A process for selectively hydroformylating a diolefin, which comprises reacting a (1-arylethenyl)-vinylbenzene with carbon monoxide and hydrogen under the conditions of 40 to 200°C in reaction temperature and 5 kg/cm2 or above in reaction pressure in the presence of a transition metal carbonylation catalyst to thereby selectively hydroformylating only the vinyl group and produce alpha-((1-arylethenyl)phenyl)-propionaldehyde. The starting material to be hydroformylated may be a mixture of the vinylbenzene with a 1,1-di(substituted aryl)ethylene not substituted by a vinyl group.
摘要:
The present invention is concerned with a novel intermediate 1,1-(3-ethylphenyl)phenylethylene represented by the formula (I) and its manufacturing method. According to the present invention, Ketoprofen can be synthesized at a low cost and in a high yield, when using the stated intermediate.
摘要:
Soluble, polymerizable oligomers having a number average molecular weight of from about 200 to about 10,000, and having more than two pendant acetylenic groups. The process for producing such oligomers: E.g. reacting phenyl triethynyl silane or triethynyl benzene in the presence of a catalyst with an aromatic acetylenic capping agent having a molar excess over the monomer.
摘要:
Provided is class of compounds of formula (I) wherein X, R1, R2 and R3 have the same meaning as given in the specification capable of releasing fragrant compounds in a controlled manner into the surroundings.