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7560462 Compounds useful for inhibiting CHK1  
Substituted urea compounds useful in the treatment of diseases and C 1-3 alkyleneOR 3 conditions related to DNA damage or lesions in DNA replication are disclosed formula (I), wherein X 1 is...
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...
6825388 Process for the preparation of 4-nitro-o-xylene  
The present invention relates to the process for vapor phase nitration of o-xylene using dilute nitric acid over H-beta zeolite. More particularly it relates to the selective formation of 4-nitro...
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...
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...
6620981 Process for the preparation of nitrotoluenes  
The present invention relates to a process for the preparation of nitrotoluenesl. More particularly, the present invention relates to a process for the preparation of nitrotoluenes with high para...
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...
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....
6255542 Process for preparing 2-chloro-4-nitroalkylbenzene  
A process for preparing 2-chloro-4-nitroalkylbenzenes is provided which comprises a ring chlorination of 4-nitroalkylbenzenes with elemental chlorine or chlorine-releasing compounds in liquid phase...
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...
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...
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.
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...
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...
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...
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...
5006325 Process for the recovery of nitric acid  
This invention relates to an improved process for the recovery and regeneration of nitric acid from spent acid obtained from the mixed acid nitration of aromatic compounds. In that process a mixed...
5001286 Process for separating sulphuric acid and nitric acid from dinitrotoluene mixtures obtained during the nitration of toluene  
Sulphuric and nitric acids present in dinitrotoluene are separated from the dinitrotoluene by adding up to 10 wt. % water (based on quantity of dinitrotoluene) to the mixture of dinitrotoluene,...
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.
RE33168 Nitration processes  
The present invention relates to improvements in processes of preparing dinitrated aromatic compounds, particularly dinitrated aniline and dinitrated substituted aniline compounds, employing...
4831193 Synthesis of 3-amino-2-methylbenzotrifluoride  
This invention relates to a novel process for preparing 3-amino-2-methylbenzotrifluoride from benzotrifluoride. The process comprises nitrating benzotrifluoride to form 3-nitrobenzotrifluoride,...
4804792 Nitration of benzene or toluene in a molten nitrate salt  
Nitration of benzene or toluene, and more specifically to such a reaction in a molten nitrate salt medium.
4650912 Recovery of nitric acid from nitration spent acid by toluene extraction  
In a method for denitrifying the nitric acid- and nitrous acid-containing spent acid phase from the nitration of an aromatic hydrocarbon by the mixed acid process which comprises forming a...
4551568 Process for nitration of benzene  
Benzene is efficiently nitrated in gaseous phase with NO 2 or N 2 O 4 in the presence of a catalyst of acidic mixed oxide containing two or more sorts of metal oxides, for example, MoO 3 --WO 3...
4496782 Nitric acid recovery by the adiabatic nitration of nitroaromatics with fortified spent acid  
A method is provided for denitrifying the aqueous spent acid of mononitration. The nitric acid in the aqueous spent acid is recovered by adiabatically reacting greater than a stoichiometric amount...
4467126 Process for the separation of di-substituted benzene  
An adsorptive separation process for separating the para-isomers of a di-substituted benzene from a feed mixture comprising the para-isomer and at least one other isomer. One substituted group is...
4465876 Nitration of aromatics with nitrogen oxides in trifluoroacetic acid  
In a process for nitrating aromatics using lower valent nitrating agents in trifluoroacetic acid, the product yield of nitroarenes can be significantly increased by maintaining an excess of...
4447662 Beta-dicarbonyl compounds for the promotion of aromatic nitration by nitrogen tetroxide  
Aromatic hydrocarbons are nitrated by reacting the aromatic hydrocarbon in a nitrogen tetroxide-containing liquid reaction medium, in the presence of a beta-dicarbonyl compound having a "W"...
4426543 Vapor phase nitration of aromatic hydrocarbons  
Aromatic hydrocarbons selected from the group consisting of benzene and toluene are nitrated in the vapor phase at temperatures between about 80° C. and about 190° C. in the presence of a...
4418230 Method for gaseous phase nitration of aromatics  
Nitration of aromatics wherein gasified aromatic compounds and nitric acid are contacted with a silicon-aluminum catalyst.
4392978 Selective aromatic nitration  
A method and reagent for the selective nitration of aromatic hydrocarbons which comprises contacting a complex of at least a catalytic amount of a polyether with a nitronium containing substance,...
4382891 Use of fluoroalkoxysulfur fluorides in fluorinations  
Fluoroalkoxysulfur fluorides of the formula ##STR1## wherein R is H, CH 3 , CF 3 , or C 2 F 5 , and n is 1 or 2, used as fluorinating agents to replace OH groups in organic molecules with F and...
Matches 1 - 50 out of 131 1 2 3 >