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Matches 551 - 600 out of 5,487

Document Document Title
WO/1992/007809A1
Process for the production of diaryls of formula (1): R?1¿¿m? - Ar - Ar - R?1¿¿m? in which: Ar is a phenylene or naphthylene group; R¿1? is a hydrogen, fluorine or chlorine atom or an unbranched or branched alkyl (C¿1?-C¿6?)-alkyl...  
WO/1992/004308A1
Disclosed is a process comprising preparing a product stream rich in naphthalene and 2-monoiodonaphthalene comprising contacting hydrogen and a feed stream containing iodonaphthalenes selected from the group consisting of monoiodonaphtha...  
WO/1992/000264A1
A method for synthesizing 1,1-bis(chlorophenyl)2,2,2-trichloroethanol (dicofol) from chloral and chlorobenzene, wherein the acid by-products generated during the condensation of the chloral and the chlorobenzene are used as a reaction me...  
WO/1991/018855A1
A process for producing a mixture of ar-brominated polyphenyl compounds with an average of from 3 to 4 bromine atoms per aromatic ring utilizing a novel catalytic system for at least a portion of the bromination reaction so as to obtain ...  
WO/1991/017135A1
The invention relates to novel phenyl cyclohexans of formula (I) in which Hal is F or Cl, l is 1, 2 or 3, r is 0 or 1 to 6; E is -A-, -A-CH�2?CH�2?- or -CH�2?CH�2?-A-, A trans-1,4-cyclohexylene, 1,4-phenylene, 3-fluor-1,4-phenyle...  
WO/1991/017134A1
The invention concerns phenyl cyclohexanes of formula (I) in which: Q is (a), (b) or (c); R is alkyl, alkoxy, oxaalkyl or haloalkyl, each with up to 12 C atoms; r is 0 or 1; X is F, Cl, CF�3?, OCF�3? or OCHF�2?; and L?1�, L?2�,...  
WO/1991/016286A1
A process is disclosed for producing $g(a)-fluorostyrol from fluorolefines. A halogen aromate (1) is converted into a $g(a)-fluorostyrol (III) with a fluorine substituted ethylene (II) in the presence of a palladium catalyzer. R may repr...  
WO/1991/016291A1
The invention relates to novel phenyl cyclohexanes of formula (I) in which Q is CH-Hal or C-Hal�2?, where Hal is F or Cl; n is 1 to 5; R is 0 to 6; A is a simple bond (a), (b) or (c) where (a) is (d), (e), (f) or (g); X is F, Cl, -CF...  
WO/1991/016287A1
1,2,4-Triflurobenzene and 1-chloro-3,4-difluorobenzene are prepared by reacting 2,4-difluoroaniline and 5-chloro-2-fluoroaniline, respectively, with t-butyl nitrite in the presence of borontrifluoride etherate complex, followed by the th...  
WO1991006522A3  
WO/1991/013847A1
1-Chloro-3,4-difluorobenzene, an intermediate in the production of certain quinolone drugs, is produced by converting a chlorofluoro-aniline into the corresponding diazonium fluoborate, and pyrolysing the latter to give the 1-chloro-3,4-...  
WO/1991/013850A1
The invention relates to 4,4'-disubstituted 2',3-difluorbiphenyls of formula (I), where n is a number from 1 to 7, A stands for trans-1,4-cyclohexylene or 1,4-phenylene, r stands for 0 or 1, X stands for F, Cl, -CF�3?, -CHF�2?, -OCF...  
WO/1991/013047A1
A regioselective process is provided for preparing 4-bromo-o-xylene in an isomer mixture of 4-bromo-o-xylene and 3-bromo-o-xylene by combining a molar excess of bromine with o-xylene. The produced 3-bromo-o-xylene isomer preferentially r...  
WO1991005750A3  
WO/1991/011418A1
Partially fluorinated compounds of formula (I): R?1�-A?1�-Z?1�-(A?2�-Z?2�)�m?-A?3�-(Y)�n?-Q- R?2� where R?1�, R?2�, A?1�, A?2�, A?3�, Z?1�, Z?2�, Y, m and n have the meanings given in claim 1 and Q stands ...  
WO/1991/008184A2
Disclosed are 1,4-disubstituted 2,6-difluorobenzene compounds of the formula (I), in which R is an unsubstituted alkyl or alkenyl residue with 1-15 C-atoms or an alkyl or alkenyl group with 1-15 C-atoms substituted with at least one halo...  
WO/1991/006523A1
Described is a method of preparation of fluorobenzenes and fluorotoluenes of the formula (I) in which X is H or a methyl group, R?1¿, R?2¿ and R?3¿, independently of each other, are at least one of the residues H, F, Cl and C¿1?-C¿3...  
WO/1991/006522A2
New phenylcyclohexanes of formula (I), where Q stands for alkylene with up to 5 C atoms or a single bond, A stands for (a), (b), (c), (d), (e), (f), (g), -CH¿2?CH¿2?CH¿2?CH¿2?-, -CH¿2?CH¿2?- or a single bond, X stands for F, Cl, -C...  
WO/1991/006518A1
Described is a method of preparation of fluorobenzenes with at least one hydrogen atom substituted on the ring and, optionally, other substituents which, independently of each other, can be chlorine, bromine, nitro, hydroxy, C¿1?-C¿3? ...  
WO/1991/005750A2
This invention concerns a process for preparing fluoroalkyl substituted olefins, fluorinated ketones and fluorinated aromatic compounds by the catalyzed reaction of fluoroalkylsilanes with selected fluorinated olefins, acyl fluorides and...  
WO1991003445A3  
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/1991/003445A2
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/1991/002779A1
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/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/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/1990/015115A1
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/1990/015114A1
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/1990/014404A1
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/1990/014405A1
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/1990/012853A1
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/1990/012073A1
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/1990/011987A1
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/1990/009972A1
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/1990/008757A1
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/1990/008748A1
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/1990/008119A1
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/1989/008687A1
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/1989/008629A1
1,4-disubstituted 2,3-difluorobenzenes of formula (I) are suitable as intermediate products in the synthesis of liquid crystal compounds.  

Matches 551 - 600 out of 5,487