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7326816 Process for the production of nitrobenzene  
Nitrobenzene is produced and then purified using an acidic wash, an alkaline wash, a neutral wash, subjecting a dispersion formed in the neutral wash to electrophoresis to separate water and...
7041858 Process for the production of dinitrotoluene  
The present invention is directed to a process for the isothermal nitration of aromatic organic compounds, wherein an aromatic organic compound is brought into contact and reacted with a mixture of...
6953869 Process for working up secondary components in the preparation of dinitrotoluene  
The present invention relates to a process for working up organic secondary components which are formed in the one-stage or two-stage nitration of toluene to dinitrotoluene. These organic secondary...
6936741 Process for working up the waste water obtained in the preparation of dinitrotoluene  
The present invention relates to a process for working up or treating aqueous waste waters which are formed during the nitration of toluene to dinitrotoluene with nitrating acid. These aqueous...
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...
6791000 Process for vapor phase nitration of benzene using nitric acid over molybdenum silica catalyst  
Nitration of benzene is an important reaction for the production of nitro benzene, which is an important intermediate in chemical and pharmaceutical industries. Conventionally nitrobenzene is...
6768032 Continuous isothermal process for preparing mononitrotoluenes in the presence of phosphoric acid  
The present invention relates to a continuous isothermal process for preparing mononitrotoluenes in the presence of a mixed acid component comprising mixtures of sulfuric acid and phosphoric acid...
6756504 Sphingolipids  
The invention relates to compounds of the general formula (I), as defined, and to pharmaceutical compositions containing them. The compounds of formula (I) are inhibitors of various lipid-related...
6703532 Process for the nitration of xylene isomers using zeolite beta catalyst  
This invention relates to a process for the nitration of xylene isomers by using zeolite-beta as a catalyst. This invention particularly relates to a process for the nitration of xylenes using...
6583327 Continuous isothermal process for preparing mononitrotoluenes  
The present invention relates to a process for the continuous isothermal preparation of mononitrotoluenes with concentration of the resultant waste sulfuric acid and recycling of the concentrated...
6515189 Reactions of aromatic compounds  
A method of reacting an aromatic compound with an immiscible reacting agent involves the passage of the reactant along a flow path having a width of from 10 to 1000 μm in such a way that...
6506948 Toluene extraction of dinitrotoluene wash water  
This invention relates to an improvement in a process for the production of dinitrotoluene and particularly to the recovery of dinitrotoluene and organic by-products from the wastewater and wash...
6506949 Process for ring nitrating aromatic compounds in a tubular reactor having static mixing elements separated by coalescing zones  
A tubular reactor characterized by having short static mixing elements separated by coalescing zones is used to conduct multiphase liquid/liquid reactions. Small droplets of one of the phases are...
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, N 2 O 3 , NO 2 and N 2 O 4 and with an...
6316675 Process for the preparation of an olefin-substituted aromatic or heteroaromatic compound  
A process for the synthesis of olefins having aromatic substituents is described in which olefins are reacted with aryl halides in the presence of catalysts consisting of palladium compounds and...
6303820 Process for the preparation of nitrosobenzenes  
The invention relates to a process for the preparation of nitrosobenzenes from aromatic amines by oxidation with hydrogen peroxide in the presence of sodium molybdate dihydrate and an inert organic...
6291726 Process for nitration of aromatic compounds using a non-acid type nitration process  
The nitration of aromatic compounds is achieved in high yield and selectivity by using oxygen activated by an inorganic catalyst and nitrogen dioxide. Since this process uses neither concentration...
6284894 Preparation of allylic aromatic compounds  
A process for the preparation of an allylic aromatic compound in which an aromatic amine is reacted first with a nitrite and then with an allylic olefin having an eliminatable terminal substituent....
6242657 Method for producing aromatic nitro compounds  
In the reaction of aromatic compounds with nitrating acids comprising HNO 3 and, if appropriate, H 2 SO 4 and/or H 2 O and/or H 3 PO 4 to form aromatic nitro compounds, according to the...
6127583 Process for preparing acetylene derivative from a ketone compound  
A preparation process of an acetylene derivative comprising reacting a compound having a skeleton represented by the formula (1): ##STR1## in the molecular formula with a compound represented by...
5998661 Preparations of organic nitro compounds through mixed oxidizing agents  
A process for selective, direct oxidation of amine or amine hydrochloride mpounds is described. It uses mixed oxidizing agents of monopersulfate and ozone.
5963878 Nitration process  
A continuous process to nitrate a nitratable aromatic compound utilizing nitric acid and sulfuric acid feed stocks is described. The process includes the collecting of NO x O gases with water...
5952531 Nitration process  
A process for the nitration of an aromatic or heteroaromatic compound with a nitrating agent comprising nitric acid or a mixture of nitric and sulphuric acids, characterised in that nitration is...
5886240 Process for preparing aromatic acetylenes using palladacycles as catalysts  
The invention relates to a process for preparing aromatic acetylenes of the formula (I): Ar--C.tbd.C--R 8a , where Ar is: ##STR1## by reacting haloaromatics or aryl sulfonates of the formula (II):...
5847240 Process for reducing tetranitromethane in compositions containing nitroaromatic compounds  
A process is disclosed for removing a light organic compound from a liquid composition comprising said light organic compound in admixture with a nitroaromatic compound, said light organic compound...
5763697 Process for the nitration of aromatic compounds  
The selective introduction of a nitro group into an aromatic compound by mixtures of nitric acid and sulphuric acid, wherein the aromatic compound to be nitrated is conveyed to a central driving...
5728901 Nitration process which employs water tolerant Lewis acid catalysts  
A process for preparing a nitrated arene which comprises reacting an arene and nitric acid in the presence of a water tolerant Lewis acid catalyst under process conditions sufficient to form the...
5648565 Process for the adiabatic preparation of mononitrotoluenes  
Mononitrotoluenes can be prepared by intensively mixing together toluene, nitric acid, sulphuric acid and water, simultaneously or successively in their total amount, and, in the case of continuous...
5488187 Process for the production of dinitrobenzene and mononitrobenzene  
Aromatic nitration reactions and, more specifically, a process for nitrating benzene to produce dinitrobenzene or mononitrobenzene in the absence of sulfuric acid and in the absence of any dipolar...
5399773 Process for the preparation of nitrophenyl alkyl ethers  
Nitrophenyl alkyl ethers can be advantageously prepared by reacting a nitrophenol with an alkyl halide in water as the reaction medium in such a manner that the nitrophenol is laid before with the...
5395995 Process for the preparation and purification of nitroaromatics  
A process for the preparation and purification of nitroaromatics by nitration of the corresponding aromatics and subsequent melt crystallization. The residual melts which occur are recycled.
5329054 Decarboxylation process  
Activated carboxylic acids and esters such as pentafluorobenzoic acid are rapidly decarboxylated in high yields by reacting the acid or ester with an alkanolamine reagent which catalyzes the reaction.
5315043 Aromatic nucleophilic fluorination  
A process for halogen exchange fluorination or fluoro-denitration of aromatic compounds having at least one replaceable non-fluorine halogen or nitro substituent with an anhydrous substantially...
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...
5270309 Kynurenic acid derivatives useful in the treatment of neurodegenerative disorders  
4-Oxo-1,4-dihydroquinoline compounds having a 2-acidic group or a group convertible thereto in vivo, and their pharmaceutically acceptable salts, are potent specific antagonists of...
5247124 Process for the preparation of substituted styrenes  
A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of...
5245092 Process for preparing dinitrotoluene with low by-product content  
Process for preparing dinitrotoluene by reacting toluene with concentrated nitric acid. The process reacts toluene with a large excess of concentrated nitric acid at selected conditions to produce...
5237077 Non-pollutional process for producing aromatic nitro compounds without using a mineral acid  
The present invention relates to a process for producing an aromatic nitro compound by introducing a nitrogen oxide gas and ozone-containing oxygen or air into a halogenated organic solvent...
5227538 Catalytic asymmetric reduction of ketones using metal catalysts  
A process is provided for the catalytic asymmetric reduction of ketones to provide alcohol reaction products which are enriched in one enantiomer. The asymmetric reduction is accomplished utilizing...
5210339 Process for nitrating benzocyclobutene compounds  
An improved process for the nitration of a substituted or unsubstituted benzocyclobutene compound in a reaction mixture comprising a nitrating agent, an unhalogenated carboxylic acid anhydride,...
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-...
5149890 Process for the isolation of pure dinitrotoluenes  
Pure or substantially enriched 2,4- and 2,6-dinitrotoluene can be isolated from a mixture containing these isomers if such a mixture is distilled under a pressure of 0.5 to 20 mbar at a temperature...
5118880 Method of preparing 2-bromo-4,6-dinitromesitylene  
A method of preparing 2-bromo-4,6-dinitromesitylene having only small amounts of impurities, by first mixing fuming sulfuric acid with bromomesitylene, and then adding concentrated nitric acid.
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...
5095157 Process for the preparation of 2-chloro-4-nitro-alkylbenzene  
In the preparation of 2-chloro-4-nitro-alkylbenzene by reaction of 4-nitro-alkylbenzene with elemental chlorine or chlorine-releasing compounds in the presence of a Friedel-Crafts catalyst in the...
5072053 1,3-di-arylmethoxy-4,6-dinitro-benzenes, process for their preparation and process for the preparation of 4,6-diaminoresorcinol  
The new 1,3-di-arylmethoxy-4,6-dinitrobenzenes of the formula ##STR1## in which R 1 and R 2 independently of one another denote hydrogen or C 1 -C 4 -alkyl and Ar represents C 6 -C 12 ...
5072061 1,14-bis(4-nitrophenyl)-1,3,5,7,9,11,13-tetradecaheptaene and preparation method thereof  
1,14-bis(4-nitrophenyl)-1,3,5,7,9,11,13-tetradecaheptaene having the following formula (I): ##STR1## and a method of preparing the above-mentioned...
5057632 Process for preparing dinitrotoluene  
Described herein is a continuous process for preparing dinitrotoluene by reacting toluene with dilute nitric acid to produce mononitrotoluene, then reacting the mononitrotoluene with concentrated...
5030776 Process for producing nitrobenzenes  
Nitrobenzenes are prepared by nitrating benzenes in vapor phase using nitric acid as a nitrating agent and under continuous or intermittent feeding of sulfuric acid as a catalyst in the presence of...
5012019 Process for purifying aromatic nitration products  
The present invention relates to a process for purifying an aromatic nitration product mixture comprising a nitrated aromatic compound, water, and nitric or sulfuric acid which comprises without...
Matches 1 - 50 out of 158 1 2 3 4 >