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Patent Searching and Data


Matches 551 - 600 out of 5,299

Document Document Title
WO/1990/014406A1
The invention relates to fluorinated cyclohexyl derivatives of formula (I), wherein R1 denotes an alkyl residue with up to 12 carbon atoms wherein one or two non-adjacent CH2-groups may also be replaced by -O-, -O-CO-, -CO-O- and/or -CH=...  
WO/1990/012853A1
Polychlorinated biphenyls are chemically degraded by contact with a Lewis acid catalyst in a nonaqueous liquid medium, in the presence of a cation which combines the chlorines on the PCBs to form a solid chloride of the cation which will...  
WO/1990/011987A1
A process for producing 2-halofluorobenzene from 2,4-dihalofluorobenzenes comprises treating an aqueous slurry of 2,4-dihalofluorobenzene with hydrogen at an elevated temperature in the presence of a transition metal supported on a carbo...  
WO/1990/012073A1
The invention concerns trifluoromethylcyclohexane derivatives of the formula (I) in which R, A?1¿, A?2¿, (a), Z?1¿, Z?2¿ and o are as defined in claim 1. These compounds can be used as components of liquid-crystal media for electro-o...  
WO/1990/009972A1
The fluoroalkyl derivative of the invention is a new compound represented by general formula (I) or (II), wherein R1 represents (a) (wherein X represents hydrogen, chlorine, bromine, fluorine, iodine, methyl, ethyl, methoxy, ethoxy or ni...  
WO/1990/009420A1
The invention relates to liquid crystalline media being a mixture of at least 2 compounds, characterized in that at least one compound is a fluorinated oligophenyl according to formulae (I) or (II).  
WO/1990/008756A1
Diphenylethanes of the formula (I): R?1¿-CH¿2?-X-(CH¿2?CH¿2?)¿m?-Ph-Ph-CH¿2?CH¿2?-Ph-Y-CH ¿2?-R?2¿, where R?1¿ and R?2¿ independently of each other denote alkyl, alkenyl or oxaalkyl with up to 12 C atoms and one of the residue...  
WO/1990/008748A1
A process for the hydrogenolysis and/or dehydrohalogenation of fluorohalocarbons and/or fluorohalohydrocarbons by reacting the fluorohalocarbons and/or fluorohalohydrocarbons with a source of hydrogen in the presence of a catalyst, the i...  
WO/1990/008757A1
Diphenylylethanes of formula (I), in which one of the residues R?1¿ and R?2¿ denotes X and the other residue R?1¿ or R?2¿ denotes R-Y-, where X denotes H, halogen, -CF¿3?, -OCHF¿2?, -OCF¿3?, -CN, -NCS or -NO¿2?, R denotes alkyl, ...  
WO/1990/008119A1
Novel phenyl naphthalenes of general formula (I) wherein R1 and R2 are selected from C1-15 alkyl, alkoxyl, perfluoroalkyl, perfluoroalkoxyl and alkynyl, R1 may also be CN and R2 may also be fluorine or NCS; m is 0, 1 or 2 provided that i...  
WO/1990/008118A1
A method for producing p-dichlorobenzene using a reactor containing a catalyst/reagent to convert chlorobenzene (or benzene) to p-dichlorobenzene, in a reactor has an inlet and an outlet for introducing reactants and removing product; in...  
WO/1990/007479A1
A method of obtaining bromated aromatic and heterocyclic combinations containing acceptor groups provides for bromination of aromatic and heterocyclic combinations, containing acceptor groups, with bromine or hydrobromic acid, the proces...  
WO/1990/006295A1
A method for the preparation of biaryl compounds is disclosed which comprises contacting an aromatic halide in the presence of a catalyst comprising zerovalent nickel, a bidentate phosphorus-containing coordinating ligand and a reducing ...  
WO/1990/001056A1
Compounds of formula (I), R-(A1-Z1)m-A2-Q-CHF2, in which R, A1, Z1, m, A2 and Q have the meanings set out in claim 1, are suitable as components of liquid crystal media.  
WO/1990/000555A1
Compounds are disclosed for treating AIDS, herpes, and other viral infections by means of lipid derivatives of antiviral agents. The compounds consist of nucleoside analogues having antiviral activity which are linked, commonly through a...  
WO/1989/009764A1
Chiral or achiral cyclic compounds of formula R1-(A1-Z1)m-A2-Q1-C*R°CF3-X, wherein R1 denotes alkyl or perfluoralkyl which can be interrupted by O- and/or -CO- and/or -CO-O- and/or -CH=CH- and/or -CH halogen- and/or -CHCN- and/or -O-CO-...  
WO/1989/009203A1
The invention relates to liquid crystalline compounds of formula (I), wherein R1, R2 and n have the meanings indicated in Patent Claim 1, and to liquid crystalline mixtures with at least two liquid crystalline compounds characterized in ...  
WO/1989/008639A1
Chiral derivatives of 1,2-difluorobenzene are suitable as components of chiral, oriented, smectic, liquid crystal phases.  
WO/1989/008631A1
A process for the liquid-phase oxyiodination of naphthalene which comprises (1) preparing a liquid-phase feed mixture of iodine and naphthalene and/or iodine, naphthalene and iodonaphthalenes, and (2) contacting the feed mixture with a z...  
WO/1989/008687A1
4-Q1-4'-Q2-2,3-difluorobiphenyls, in which Q1 and Q2, independently of each other, denote R or R-A1-A2-Z, where R denotes alkyl with 1-15 C atoms or alkenyl with 3-15 C atoms, which in each case is unsubstituted, singly substituted by cy...  
WO/1989/008633A1
Difluorobenzol derivatives of formula (I) wherein Q1 and Q2, independently, denote R or R-A1-A2-Z, where R denotes an unsubstituted C1-C15 alkyl or a C1-C15 alkyl or C3-C15 alkenyl monosubstituted by cyanogen or at least monosubstituted ...  
WO/1989/008629A1
1,4-disubstituted 2,3-difluorobenzenes of formula (I) are suitable as intermediate products in the synthesis of liquid crystal compounds.  
WO/1989/004819A1
Derivatives of trifluoromethyl-1-tetralines having the general formula (I), wherein X is a hydrogen atom, a halogen, a hydroxy group, an alkoxy group from C1 to C8 or an optionally substituted aromatic ring; R1 is a hydrogen atom or an h...  
WO/1989/004817A1
Disclosed is a process for continuous preparation of aromatic fluorides wherein aromatic diazonium fluorides are continuously decomposed at low concentration in a reaction system of one or more continuous agitated reactors.  
WO/1989/003812A1
Compounds of formula (I): R1-(Ao)k-(Z1-A1)m-Zo-(E)n-(Q)o-(Z2-A2)p-R2 can be produced easily and in large quantities by transition metal catalysis from organotitanium compounds of formula (II): R1-(Ao)-(Z1-A1)m-Zo-Ti(Y)3 and compounds of ...  
WO/1989/003373A1
A process for iodinating aromatic compounds, comprising the steps of iodinating an aromatic compound, separating a desired iodoaromatic product from the product mixture, purifying said desired iodoaromatic product, and isolating said des...  
WO/1989/003417A1
Polybrominated higher alkylbenzenes may be produced by reacting the corresponding hydrocarbon material with bromine chloride in an excess bromine reaction medium in the presence of an antimony halide catalyst.  
WO/1989/002425A1
This invention relates to fluorinated oligophenyls of formula (I), in which a is 0 or 1 and in which the terminal substituents R1, R2 and R3 are each independently an alkyl or alkenyl residue each with up to 15 C atoms, optionally substi...  
WO/1989/000986A1
A process for the vapor phase iodination of an aromatic compound which involves combusting an alkyl aromatic iodide in the presence of oxygen to produce molecular iodine and feeding the molecular iodine and an aromatic compound to an oxy...  
WO/1988/009319A1
A process for preparing substituted alpha-methylstyrene by heating the corresponding alpha-halocumene to a temperature up to 130°C. Water and optionally an organic compound are used as solvent.  
WO/1988/009322A1
The invention concerns cyclobutane derivatives of formula (I) R1-A1-Z1-A2-(Z2-A3)n-R2, which are suitable components of liquid crystal phases.  
WO/1988/008416A1
Compounds of formula (I), in which Ar is substituted or unsubstituted phenyl, naphthyl, or thienyl; Z is oxygen, sulfur, or methylene; and Ar' is 2-methyl[1,1'-biphenyl]-3-yl, 3-phenoxy-phenyl, 4-fluoro-3-phenoxyphenyl, or 6-phenoxy-2-py...  
WO/1988/008441A1
An electro-optical liquid crystal display element comprises a dielectric with at least two liquid crystal components. In order to shorten the switching time, the dielectric contains at least one fluorine compound of formula (I): R1-(A1-Z...  
WO/1988/007987A1
An improved process is disclosed for preparing aromatic fluorides by diazotization-fluorination in hydrogen fluoride wherein the diazotized reaction mixture includes an oxidizing agent such as nitrosonium ion from excess diazotization ag...  
WO/1988/007510A1
The invention relates to a process for isomerizing liquid iodoaromatic compounds over an acid catalyst.  
WO/1988/007514A1
Tolanes having the formula (I): R1-(A1-Z1)m-A3-C=C-A4-(A2)n-R2, in which R1, A1, Z1, m, A3, A4, A2, n and R2 are as given in claim (1), and application of said tolanes as components of liquid crystal phases, particularly as components of...  
WO/1988/007511A1
The invention relates to a process for isomerizing iodoaromatic compounds over a non-acidic zeolite catalyst in the liquid or gas phase in the presence of a source of iodine.  
WO/1988/007523A1
Compositions containing the structural constituents -A3-C=C-A4-in which A3 and A4 each independently represent; a) a 1,4-phenylene residue, in which one or more non-adjacent CH groups may be replaced by N; b) a 4,4-biphenylene residue, i...  
WO/1988/007513A1
The invention relates to a process for the vapor phase bromination of aromatic compounds in the presence of oxygen and a catalyst containing an oxidizing metal and an inert support.  
WO/1988/007512A1
The invention relates to a process for isomerizing and transiodinating iodoaromatic compounds over a non-acid catalyst.  
WO/1988/007516A1
Ethine derivatives of the formula R1-(A1-Z1)m-A3-C=C-A4-(Z2-A2)n-R2, in which R2 = -OCF3'-OC2F4H or -OC2F5 are suitable as components of liquid crystal phases.  
WO/1988/007509A1
A process for iodinating an aromatic compound in which a source of iodine is reacted with the aromatic compound in the presence of oxygen over a non-acid catalyst wherein the aromatic compound in the presence of oxygen over a non-acid ca...  
WO1988002357A3  
WO/1988/002357A2
Compounds having formula (I): R1-(Ao)k-(Z1-A1)m-Zo-(E)n-(Q)o-(Z2-A2)p-R2, can be easily produced in high yields from organic zinc compounds having formula (II): R1-(Ao)k-(Z1-A1)m-Zo-ZnY and compounds having formula (III): X-(E)n-(Q)o-(Z2...  
WO/1988/002358A1
Process for iodination of aromatic compounds in the presence of oxygen over a zeolite catalyst.  
WO/1987/006602A1
Trifluortoluol derivates having formula (I), in which R1 means alkyl with 1 to 12 C atoms, in which one or several non-adjacent CH2 groups may be substituted by -O-, -CO-, -O-CO-, -CO-O-, -O-CO-O-, -CH halogen, -CH-CN- and/or -CH=CH-; A1...  
WO1987005293A3  
WO/1987/005293A2
Cyclohexane derivates have formula (I), in which: R is an alkyl group with 1-12 C atoms in which one or two non-adjacent CH2-groups may also be substituted with O, -CO-O- or -OCO-, A1 and A2 are independently from each other trans-1,4-cy...  
WO/1987/005015A1
Optically active compounds of the cyclohexane series can be used as components of chirally tilted smectic liquid crystal phases.  
WO/1987/004150A1
A process for preparing fluoroaromatic compounds (such as fluoronitrobenzene compounds) by reaction of corresponding chloroaromatic compounds (such as chloronitrobenzene compounds) with alkali metal fluoride salts in the presence of alky...  

Matches 551 - 600 out of 5,299