摘要:
The invention relates to a catalyst for dehydrogenating 1,1-diphenylethane and substituted 1,1-diarylethanes, especially for non-oxidatively dehydrogenating 1,1-diarylethanes to 1,1-diarylethenes, based on iron, potassium and cerium. Said catalyst advantageously contains up to 90 wt. % iron, calculated as Fe2O3, 5 to 40 wt. % potassium, calculated as K2O, 0.01 to 30 wt. % cerium, calculated as Ce2O3, 0.01 to 10 wt. % magnesium, calculated as MgO, 0.01 to 10 wt. % vanadium, calculated as V2O5, 0.01 to 10 wt. % wolfram and/or molybdenum, calculated as WO3 or MoO3 and optionally, 0.01 to 5 wt. % aluminium, calculated as Al2O3 and/or 0.01 to 10 wt. % calcium, calculated as CaO. The invention also relates to a method for non-oxidatively dehydrogenating 1,1-diarylethanes, especially 1,1-diphenylethane to 1,1-diarylethenes or 1,1-diphenylethene in the presence of overheated water vapour, using a catalyst of this type.
摘要翻译:本发明涉及用于使1,1-二苯基乙烷和取代的1,1-二芳基乙烷脱氢的催化剂,尤其是用于将1,1-二芳基乙烷非氧化脱氢为1,1-二芳基乙烯的基于铁,钾和铈的催化剂。 所述催化剂有利地含有至多90wt。 %铁,以Fe2O3计算,5至40wt。 %钾,按K2O计算,0.01至30wt。 %Ce,以Ce 2 O 3计算,0.01至10wt。 %的镁,以MgO计算,0.01-10wt。 以V 2 O 5计算的钒%,0.01至10wt。 %wolfram和/或钼,以WO 3或MoO 3计算,并且任选地0.01至5wt。 %的铝,以Al 2 O 3计算和/或0.01-10wt。 %的钙,以CaO计算。 本发明还涉及使用这种类型的催化剂在过热水蒸气存在下使1,1-二芳基乙烷,特别是1,1-二苯基乙烷非氧化脱氢成1,1-二芳基乙烯或1,1-二苯基乙烯的方法 。
摘要:
The present invention relates to a method of making alpha-methylstyrene dimers by combining a cobalt catalyst, a free-radical initiator and an alpha-methylstyrene monomer, in an inert atmosphere, to form a mixture. The mixture is heated to a temperature in the range of 65 °C to 140 °C to form alpha methyl styrene dimers. The present invention also relates to the products produced by this inventive method.
摘要:
The present invention provides compounds having the formula: in which R is hydrogen or C 1 -C 4 alkyl, preferably hydrogen and Y is hydrogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, CF 3 , halogen (F, Cl, Br or I) or SO 3 M in which M is H, Na, K, Ca, Mg, ammonium, mono-, di-, tri- or tetra-C 1 -C 4 alkylammonium, mono-, di- or tri-hydroxyalkylammonium or ammonium that is di- or tri-substituted with a mixture of C 1 -C 4 alkyl and C 1 -C 4 hydroxyalkyl groups; a process for their production by partial dehydration of compounds having the formula: ; and their use as intermediates in the production of asymmetric or symmetric fluorescent whitening agents.
摘要:
A compound of the formula (1), and a liquid crystal composition comprising the same: wherein R and R ' are alkyl groups having 1 to 10 carbon atoms, cyano groups, halogen atoms; rings A 1 , A 2 , A 3 and A 4 are benzene, cycloalkane having 3 to 8 carbon atoms; at least one of Z 1 , Z 2 and Z 3 is an alkenylene group of the formula Q: wherein P 1 and P 2 are hydrogen atoms or alkyl groups having 1 to 10 carbon atoms, provided that at least one of P 1 and P 2 is alkyl group having 1 to 10 carbon atoms, q and r are 0 to 2 and the sum of q + r is 2 or less; and the other of Z 1 , Z 2 and Z 3 are -CH 2 CH 2 -, m and n are 0 or 1. The liquid crystal compound of the invention has broader temperature range of a liquid crystal phase, excellent compatibility with other liquid crystal compounds, high stability and large elastic coefficient ratio K 33 /K 11 .
摘要:
The present invention is to provide a liquid crystalline compound which has a large ratio of elastic constants and low viscosity, is excellent in miscibility, and is even chemically stable, and to provide a liquid crystal composition containing the liquid crystalline compound. The present invention is concerned with a liquid crystalline compound expressed by general formula (1) wherein R 1 represents cyano group, halogen atom, or a straight or branched alkyl group or halogenated alkyl group having 1 to 20 carbon atoms, one or not-adjacent two CH 2 groups in the alkyl group or halogenated alkyl group may be replaced by oxygen atom or -CH=CH- group; R 2 and R 2 ' represent hydrogen atom, halogen atom, or an alkyl group having 1 to 9 carbon atoms; X 1 , X 2 , and X 3 independently represent -CH 2 CH 2 -, -CO-O-, -O-CO-, -CH=CH-, -C≡C-, -(CH 2 ) 4 -, -CF 2 O-, -OCF 2 -, -CH 2 O-, -OCH 2 -, or a covalent bond; rings A, B, C, and D independently represent 1,4-phenylene ring, trans-1,4-cyclohexylene ring, bicyclo[1,1,0]butane ring, bicyclo[1,1,1]pentane ring, bicyclo[3,2,2]octane ring, cyclobutane ring, or spiro[3,3]heptane ring, respectively, hydrogen atom in these rings may be replaced by halogen atom and carbon atom in these rings may be replaced by nitrogen atom or oxygen atom; ℓ, m, and o are independently 0 or 1, n is an integer of 0 to 3, and p is an integer of 1 to 5. Liquid crystal composition having excellent physical properties, that is, steep threshold characteristics and high response speed can be obtained by providing a novel liquid crystalline compound having a large ratio of elastic constants and low viscosity, or by including the liquid crystalline compound in a liquid crystal composition.
摘要:
1-pentene dimers of α -methylstyrenes are produced with high selectivity in good productivity by stirring 50 to 95 parts by weight of an α -methylstyrene in the presence of 50 to 5 parts by weight of an aqueous solution of a sulfonic acid, and a 1-pentene dimer having good preservative property is then collected by removing the sulfonic acid, adjusting the resulting reaction solution to pH 8 or higher and distilling the neutralized reaction solution.
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 novel liquid crystal material having a carbon chain containing a conjugated diene as a terminal substituent of the molecule and exhibiting superior characteristics is provided, which is a diene derivative expressed by the formula (I)
wherein R and R' each independently represent 1-5C alkyl; A and B each independently represent 1,4-cyclohexylene or 1,4-phenylene; n is 0 or 1; m is an integer of 0 to 2; X and X' each independently represent H atom or F atom when A is 1,4-phenylene or represent H atom when A is 1,4-cyclohexylene; Y is alkyl, halogen or CN, alkoxy, methyl group substituted by 1-3 halogen atoms or trihaloalkoxy when A is 1,4-phenylene, or represent alkyl, alkoxy, methyl group substituted by 1-3 halogen atoms or trihaloalkoxy when A is 1,4-cyclohexylene; and R and R' are not simultaneously alkyl chain of 4 or more carbon atoms. The compound of the present invention has a generally usable viscosity and a high NI point and a high elastic constant ratio; hence the liquid crystal composition, particularly the liquid crystal composition for STN, containing the compound of the present invention exhibits improved characteristics as compared with the conventional ones.
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.