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Patent Searching and Data


Matches 551 - 600 out of 5,316

Document Document Title
WO/1991/003445A2
New halogenated benzene derivatives of formula (I), where n is 1 to 7, the rings A and B each stand for trans-1,4-cyclohexylene, or one of the rings A and B also stands for 1,4-phenylene or 3-fluor-1,4-phenylene, X F, Cl, -CHF�2?, -CF...  
WO/1991/003450A1
Fluorobenzole derivatives of formula (I) in which: R is H, an unsubstituted alkyl or alkenyl residue with 1 to 15 C atoms or one substituted by CN or CF�3? or at least simply by halogen, in which in these residues one or several CH�2...  
WO/1991/003446A1
Novel phenylcyclohexanes of formula (I) in which: L?1� and L?2� are CH�3? or one of the residues L?1� and L?2� may also be C�2?H�5? or L?1�L?2�CH- is also (a), (b), (c), or (d), where R is H or straight-chained lower al...  
WO/1991/002709A1
New phenylcyclohexanes are disclosed, having formula (I), in which n is 0 to 7, Q?1� and Q?2� represent H, or one of these residues may also represent CH�3?, r is 0, 1, 2, 3, 4 or 5, A is trans-1,4-cyclohexylene, 1,4-phenylene, 3-f...  
WO/1991/002779A1
Liquid crystalline medium having a high specific resistance and based on a mixture of polar compounds having a dielectric anisotropy greater than +1.5, characterized in that it contains one or more compounds chosen from the group of comp...  
WO/1990/015114A1
Ring compounds of formula (I), wherein R1 denotes an alkyl residue of up to 12 carbon atoms wherein one or two CH2 groups may also be replaced by -O- and/or -CH=CH-, m is 1 or 2, L1, L2 and L3 are each independently H or F, and X is F, C...  
WO/1990/015115A1
The invention relates to fluorinated biphenyl 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=CH...  
WO/1990/015113A1
The invention relates to fluoro-chloro-benzene derivatives of formula (I), wherein R denotes an alkyl or halogenoalkyl residue of up to 12 C atoms wherein one or two non-adjacent CH¿2? groups may also be replaced by -O- and/or -HC=CH-, ...  
WO/1990/014405A1
The invention relates to chlorobenzene 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=CH-.  
WO/1990/014404A1
Trifluorotoluol compounds of formula (I), where n is a number between 1 and 12 and Q is (a), (b), (c), (d) or (e), are suitable as components of liquid crystalline media.  
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.  

Matches 551 - 600 out of 5,316