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| Number | Title | Issue Date |
| 8030527 | Process for preparing substituted biphenyls A process for preparing substituted biphenyls of the formula I in which the substituents are defined as follows: X is fluorine or chlorine; R1 is nitro, amino or NHR3; ... | 10/04/2011 |
| 7772446 | Method for producing substituted biphenyls A process for preparing substituted biphenyls in which R1=nitro, amino or NHR3, R2=CN, NO2, halogen, C1-C6-alkyl, C2-C | 08/10/2010 |
| 7166337 | Liquid-crystal composition, methods of adjusting the resistance, and substituted phenols The present invention relates to liquid-crystal mixtures having specific resistance values, comprising acidic compounds. The present invention furthermore relates to liquid-crystal displays containing these liquid-crystal mixtures. The invention furthermore relates ... | 01/23/2007 |
| 6992230 | Process for the production of 1,5-dinitronaphthalene The invention is directed to a process for the production of 1,5-dinitronaphthalene wherein naphthalene is nitrated by nitric acid in the absence of sulfuric acid at temperatures of from 30 to 80° C., wherein the nitric acid has a concentration of from 72 to 87 wt.... | 01/31/2006 |
| 6906231 | Aromatic nitration reactions A process for the nitration of an aromatic compound, wherein the aromatic compound is admixed with a nitrating agent in the presence of an ionic liquid is described. The method for the nitration of aromatic compounds in (e.g. neutral) ionic liquids has advantages ov... | 06/14/2005 |
| 6737554 | Process for the production of a dinitronaphthalene isomer mixture with a high proportion of 1,5-dinitronaphthalene The present invention relates to a process for the production of a dinitronaphthalene isomer mixture, in which naphthalene and/or 1-nitronaphthalene is reacted with nitric acid in the presence of a zeolite. ... | 05/18/2004 |
| 6610889 | Catalytic compositions and methods for asymmetric aldol reactions Methods and compositions are provided for the direct catalytic asymmetric aldol reaction of aldehydes with donor molecules selected from ketones and nitroalkyl compounds. The reactions employ as catalyst a Group 2A or Group 2B metal complex of a ligand of... | 08/26/2003 |
| 6548722 | Process for the preparation of substituted aromatic compound employing friedel-crafts reaction using a reusable basic anionic clay catalyst A process for Friedel-Crafts type liquid-phase alkylation or acylation of an aromatic compound using a hydrotalcite-type basic anionic clay catalyst represented by a formula: [(M2-)1-x (M3+)x (OH)2 ]x... | 04/15/2003 |
| 6420616 | Process for preparing a dinitronaphthalene isomer mixture having an increased proportion of 1,5- dinitronaphthalene The present invention relates to a process for preparing a dinitronaphthalene isomer mixture having an increased proportion of 1,5-dinitronaphthalene by nitrating naphthalene in the presence of at least one ionic liquid.... | 07/16/2002 |
| 6417357 | Coupling reactions with palladium catalysts This invention relates to a novel, inventive process for the preparation of biphenyls or aromatic olefins by coupling reactions of the Suzuki coupling and Heck coupling type, using allylpalladium catalysts of the μ-halo(triisopropylphosphine)(η3 | 07/09/2002 |
| 6392111 | Method for producing olefins Olefins containing aromatic substituents are synthesized without the addition of phosphonium salts or phosphanes with the aid of a PdII compound as a catalyst in the presence of nitrogen-containing additives such as N,N-dimethylglycine and a ba... | 05/21/2002 |
| 6362381 | Nitration of aromatic hydrocarbons Aromatic hydrocarbons are nitrated by a process in which the aromatic hydrocarbon is reacted in the liquid phase with an oxide of nitrogen selected from NO, N2 O3, NO2 and N2 O4 and with an oxygen-con... | 03/26/2002 |
| 6362380 | Preparation of nitrobiphenyls A process for preparing nitrobiphenyls of the formula I ##STR1## where m is 1 or 2, R is halogen R' or OR', where R' is a C-organic radical which may carry groups inert under the reaction conditions, n is 0, 1, 2 or 3, and, in the case of n being 2 or 3, ... | 03/26/2002 |
| 6218564 | Process for the preparation of substituted aromatic compounds A process for the preparation of a substituted aromatic compound in which a chloroaromatic compound and an alkyl-, alkenyl- or aryl-boronic acid ester or anhydride are coupled in the presence of palladium and a lipophilic aliphatic phosphine comprising at... | 04/17/2001 |
| 6087542 | Process for preparing nitrobiphenylene A process for preparing nitrobiphenyls of the formula I ##STR1## where m is 1 or 2, H is halogen R' or OR', where R' is a C-organic radical which may carry groups inert under the reaction conditions, n is 0, 1, 2 or 3, and, in the case of n being 2 or 3, ... | 07/11/2000 |
| 5886242 | Polymerizable, chiral compounds and their use The invention relates to chiral compounds containing at least one divalent or polyvalent chiral group, at least one polymerizable group, at least one spacer and at least one mesogenic group, and to their use as polymerizable, chiral dopes for the preparat... | 03/23/1999 |
| 5763687 | Preparation process for aromatic mononitro compounds An improved preparation process for an aromatic mononitro compound comprising reacting an aromatic compound with mixed acid consisting of nitric acid, sulfuric acid or phosphoric acid and water, wherein these flow to react with each other in a reactor com... | 06/09/1998 |
| 5334754 | Process for preparing 2,5-diphenylterephthalic acid by oxidation Provided is a process for preparing 2,5-diphenylterephthalic acid, which is useful in preparing certain polyesters, especially liquid-crystalline polyesters. In this process, p-xylene is di-alkylated with cyclohexene to provide 2,5-dicyclo-hexyl-p-xylene,... | 08/02/1994 |
| 5312994 | Phenylethynyl endcapping reagents and reactive diluents A composition of matter having the general structure: ##STR1## (wherein X is F, Cl, or NO2, and Y is CO, SO2 or C(CF3)2) is employed to terminate a nucleophilic reagent, resulting in the exclusive productio... | 05/17/1994 |
| 5313009 | Nitration process A continuous process to nitrate a nitratable aromatic compound in a nitronium ion solution in a nitrator. The process comprises feeding into the nitrator nitronium ion solution of a composition within an area defined by connecting three points in a ternar... | 05/17/1994 |
| 5264511 | Polymers of bis (ethynylstyryl) benzene and related monomers Monomers, B-stage polymers, C-stage polymers, cured polymers and electricy conducting polymers of acetylene-terminated aromatic monomers containing three benzene rings separated by ethylene groups are disclosed. These new polymers can withstand aggressiv... | 11/23/1993 |
| 5260285 | Substituted imidazopyridazines as angiotensin II antagonists Novel substituted imidazopyridazines of formula (I) which are useful as angiotensin II antagonists, are disclosed. ##STR1##... | 11/09/1993 |
| 5162583 | Benzylether derivatives Disclosed herein are the derivative of benzyl ether represented by the formula (I) ##STR1## which is useful as an intermediate compound of the derivatives of 1,5-diphenyl-1H-1,2,4- triazole-3-carboxamide represented by the formula (II), ##S... | 11/10/1992 |
| 5132437 | Synthesis of 1-aminoanthraquinone 1-Aminoanthraquinone (1-AAQ) is synthesized by the reaction of 2-chlorobenzyl chloride and xylene in the presence of a solid acid catalyst to yield 2-chloro dimethyldiphenylmethane, subsequent oxidation of the methyl groups, ring closure to form a 1-chlor... | 07/21/1992 |
| 5103038 | Substituted cyclopentadiene electron transport compounds Novel tetrasubstituted dicyanomethylene cyclopentadienes are provided which have utility as electron-transport agents in positively-charged electrophotographic elements. The compounds are characterized by the formula: ##STR1## wherein: R1 | 04/07/1992 |
| 5099079 | Process for separating acid from nitro substituted aromatics using a molten nitrate salt Described herein is a process for separating an acid impurity from a solution containing acid and a nitro substituted aromatic compound by contacting the solution with at least one molten nitrate salt.... | 03/24/1992 |
| 5047420 | 1,3-diaryl cyclopentanes and derivatives thereof as PAF antagonists Novel 1,3-diaryl cyclopentanes of the following general formula were prepared. ##STR1## These compounds were found to have potent and specific PAF (Platelet Activating Factor) antagonistic activities and as such useful in the treatment or amelio... | 09/10/1991 |
| 5023386 | Production of hexanitrostilbene (HNS) A relatively fast process for producing HNS from trinitrotoluene (TNT) in high yield consists of oxidizing TNT with an oxidizing transition metal compound within a polar aprotic solvent having a weak base, such as an alkali metal carboxylate, dissolved th... | 06/11/1991 |
| 4985178 | Nonlinear optical device from 3-methyl-4-methoxy-4'-nitrostilbene A nonlinear optical element comprising 3-methyl-4-methoxy-4'-nitrostilbene useful for nonlinear optical and electro-optic effects.... | 01/15/1991 |
| 4973770 | Manufacture of organic nitro compounds Process for the mononitration of a nitratable organic compound, such as benzene, with a mixed acid in which one of the reactants is delivered into a body of the other reactant in the form of ultra-fine droplets through an atomizing nozzle or similar orifi... | 11/27/1990 |
| 4956123 | Method for manufacture of fluorine-containing aromatic derivatives Fluorine-containing aromatic derivatives are produced by the reaction of di(haloacyl)peroxide represented by the general formula: ##STR1## (wherein X stands for a fluorine, chlorine, or hydrogen atom and n for an integer of the value of 1 to 10) with... | 09/11/1990 |
| 4853151 | Dispirotetradecanes Dispirotetradecanes of the formula I ##STR1## wherein R1 and R2 are each independently of each other alkyl containing 1 to 12 carbon atoms wherein one or more non-adjacent CH2 groups may also be replaced by --O--, --C... | 08/01/1989 |
| 4853397 | Substituted furazans and insecticidal and acaricidal use Insecticidal and acaricidal novel substituted furazans of the formula ##STR1## n which R1 and R2 are identical or different and represent hydrogen, halogen, alkyl, alkoxy, alkylthio, halogenoalkyl, halogenoalkoxy, halogenoalkylt... | 08/01/1989 |
| 4814483 | Process for the preparation of optionally substituted 2-benzyl-toluenes Optionally substituted 2-benzyl-toluenes can be prepared by reaction of optionally substituted 2-benzyl-tert.-alkyl-toluenes with an optionally substituted aromatic hydrocarbon in the presence of anhydrous iron-(III) halide. The reaction is carried out at... | 03/21/1989 |
| 4791123 | Insecticidal triffluormethyl alkane derivatives There are provided new alkane and alkoxyalkane derivatives of the general formula I ##STR1## in which R1, R2, R3, R4 and A have the meanings given in the description, processes for their preparation and ins... | 12/13/1988 |
| 4734532 | Process for the preparation of 4,4'-dinitrodibenzyls 4,4'-dinitrodibenzyls are prepared by reaction of 4-nitrotoluenes, in the presence of an organic solvent and/or diluent, with an alkali metal-alcoholate and/or an alkaline earth metal alcoholate, and subsequent treatment of the reaction mixture with an aq... | 03/29/1988 |
| 4721821 | Method for preparing nitrobibenzyl systems Method for preparing bibenzyl systems with nitro groups as substituents. Toluene derivates with nitro groups are coupled oxidatively in methanolic alkali solution under influence of metal catalysts. The oxidation is preferably done with air. As catalysts ... | 01/26/1988 |
| 4709107 | Process for producing nitrones A method for preparing nitrones from mixtures of arylhydroxylamines and alkylhydroxylamines containing zinc oxide solids is provided which does not require filtration of the mixture prior to reaction. This is accomplished by introducing a dilute acid solu... | 11/24/1987 |
| 4626606 | Production of hexanitrostilbene (HNS) A process for the manufacture of 2,2', 4,4', 6,6-hexanitrostilbene (HNS) from dipicrylethane (DPE) or trinitrotoluene (TNT) which consists of oxidizing DPE or TNE substrate in the presence of an aprotic solvent and a basic salt of a carboxylic acid. The a... | 12/02/1986 |
| 4590263 | High speed diazonium salts useful in diazo type photoreproduction Novel diazonium salts which possess excellent photo speed, good thermal stability, exceptional resistance to discoloration in the Dmin areas, rapid development, and allow a wide range of azo dye colors are provided. The diazonium salts are of t... | 05/20/1986 |
