Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7371861 | Process for preparing ring-fluorinated aromatics The present invention relates to an improved process for preparing ring-fluorinated aromatics of the general formula (I) by a halogen exchange reaction (halex reaction) of a plurality of halogen substituents in one stage in... | 05/13/2008 |
| 7303732 | 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 dispersed into the other phase by the static mixing elements. These dr... | 12/04/2007 |
| 7247733 | Process for preparing nuclear-fluorinated aromatics The present invention relates to the preparation of nuclear-fluorinated aromatics by reacting, with a fluoride at 40 to 260° C., an aromatic compound substituted at the nucleus with halogen that is exchangeable for fluorine in the presence of at least one compound ... | 07/24/2007 |
| 7217842 | Catalysts for nucleophilic substitution, synthesis thereof, composition containing them and use thereof The invention concerns novel catalysts for aromatic nucleophilic substitution. Said catalysts are compounds of the general formula (I), wherein: R1, R2, R3, R4, R5, and R6, identical or different, are... | 05/15/2007 |
| 7091362 | Process for preparing nuclear-fluorinated aromatics The present invention relates to the preparation of nuclear-fluorinated aromatics by reacting, with a fluoride at 40 to 260° C., an aromatic compound substituted at the nucleus with halogen that is exchangeable for fluorine in the presence of at least one compound ... | 08/15/2006 |
| 7081548 | Process for preparing 3-chloro-5-nitrotoluene A preparation process of 3-chloro-5-nitrotoluene is provided in mild conditions. It is a process for preparing 3-chloro-5-nitrotoluene, which involves the steps of reacting 2-methyl-4-nitroaniline with a chlorinating agent such as 5-butyl hypochlorite in a neutral c... | 07/25/2006 |
| 6927063 | Humidity indicators Silica-based carrier impregnated with iron(III) or iron(II) salts functions as a humidity indicator giving a yellow/amber to nearly colourless colour change as the carrier humidifies. ... | 08/09/2005 |
| 6806388 | Polyfluorinated aromatic or heterocyclic derivatives with sulphurpentalfluoride group(s) The invention provides polyfluorinated aromatic or heterocyclic compounds comprising at least three ring substituents, at least one of which comprises a sulfurpentafluoride group and at least one of which comprises a labile group; methods for their preparation are a... | 10/19/2004 |
| 6794549 | Continuous adiabatic process for nitrating chlorobenzene The present invention relates to a continuous adiabatic process for preparing nitrochlorobenzene in the presence of phosphoric acid. The waste acid produced during the practice of the process is reconcentrated and recycled into the nitration reaction. ... | 09/21/2004 |
| 6586645 | Continuous adiabatic process for preparing nitrochlorobenzene The present invention relates to a continuous adiabatic process for preparing nitrochlorobenzene, in which the waste sulfuric acid produced during the practice of the process is reconcentrated and recycled into the nitration reaction.... | 07/01/2003 |
| 6380440 | Processes for the preparation of 3-bromoanisole and 3-bromonitrobenzene Process for the preparation of 3-bromoanisole comprising methoxydenitrating 3-bromonitrobenzene in the presence of a phase-transfer catalyst (PTC), and the preparation of 3-bromonirtobenzene by the bromination of nitrobenzene with bromine in oleum. The me... | 04/30/2002 |
| 6307045 | Process for producing halogenated benzene compound The present invention provides a process for producing halogenated benzene compounds. In the process, an organometallic compound represented by the general formula [I]: ##STR1## wherein M represents an R13 Sn group, an R13 | 10/23/2001 |
| 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. Novel allylic derivatives of disubstituted benzene compou... | 09/04/2001 |
| 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 and in the presence of Friedel-Crafts catalysts and speci... | 07/03/2001 |
| 5773651 | Process for the preparation of fluorine-containing chemical compounds Process for the preparation of fluorine-containing compounds by reduction in a container provided with a stirrer, the stirrer being constructed entirely or partly of a carbon material.... | 06/30/1998 |
| 5756834 | Process for preparing fluorinated aromatics It is known to prepare fluorinated aromatic compounds of the formula I ##STR1## in which X, Y and Z can have the meaning specified in the description, by reacting aromatic compounds of the formula II ##STR2## in which X, Y and Z have the meaning... | 05/26/1998 |
| 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 nitrated arene and recovering the nitrated arene. Suitable L... | 03/17/1998 |
| 5714647 | Process for the adiabatic preparation of mononitrohalogenobenzenes Mononitrohalogenobenzenes can be prepared by mixing halogenobenzene, nitric acid, sulphuric acid and water intensively with one another, simultaneously or in succession in their total quantity, and by redispersing them at least twice in the case of contin... | 02/03/1998 |
| 5599814 | Pyridazinedione compounds useful in treating neurological disorders The present invention relates to pyridazino[4,5-b]quinolines, and pharmaceutically useful salts thereof, which are excitatory amino acid antagonists and which are useful when such antagonism is desired such as in the treatment of neurological disorders. T... | 02/04/1997 |
| 5600036 | 2-trifluoromethyl-4-chlorobenzalchloride and 2-methyl-3-nitro-5-chlorobenzotrifluoride useful as intermediates for preparing 2-methyl-3-aminobenzotrifluoride 2-Trifluoromethyl-4-chloro-benzalchloride and 2-methyl-3-nitro-5-chlorobenzotrifluoride, are intermediates in a process of preparing 2-methyl-3-aminobenzo-trifluoride. In this process, 2-trifluoromethyl-4-chlorobenzal-chloride is prepared by chlorinating ... | 02/04/1997 |
| 5545768 | Process for the preparation of chlorofluronitrobenzenes and difluoronitrobenzenes A process for the preparation of chlorofluoronitrobenzenes and difluoronitrobenzenes, which comprises heating dichloronitrobenzene to not more than 200° C. in excess with an alkali metal fluoride having a total water content of about 0.2 to about 2.5% by... | 08/13/1996 |
| 5475163 | Process for the preparation of 2,3-dichloro-nitrobenzene 2,3-dichloro-nitrobenzene can be prepared by nitration of 1,2-dichlorobenzene using an anhydrous mixture of phosphoric acid, sulphuric acid and nitric acid. The conditions according to the invention displace the ratio of 2,3,-dichloro-nitrobenzene and ... | 12/12/1995 |
| 5463148 | Process for the preparation of chlorofluoronitrobenzenes A process for the preparation of chlorofluoronitrobenzenes in high yields, by reacting dichloronitrobenzenes with alkali metal fluorides having a water content of up to about 2.5% by weight in the presence of a quaternary ammonium and/or phosphonium salt,... | 10/31/1995 |
| 5449831 | Process of preparing 2-methyl-3-aminobenzotrifluoride 2-methyl-3-aminobenzo-trifluoride is prepared with high yields and high productivity by first halogenating o-trifluoromethylbenzalhalide, then secondly hydrogenating 2-trifluoromethyl-4-halogeno-benzalhalide formed by the first reaction, then thirdly nitr... | 09/12/1995 |
| 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 molten alkali metal acid fluoride composition wherein the alk... | 05/24/1994 |
| 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 |
| 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 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-me... | 09/21/1993 |
| 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, clay and a solvent to produce a corresponding nitrobenzocyclo... | 05/11/1993 |
| 5194672 | 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 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-me... | 03/16/1993 |
| 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 |
| 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.... | 06/02/1992 |
| 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 liquid phase, particularly high selectivities in respect of... | 03/10/1992 |
| 5090965 | Process for the separation of substances by cooling crystallization In the process for the separation of substances by cooling crystallization, the mixture remaining in the crystallizer after separation of the crystal layer is removed and the crystal layer is melted. The process is distinguished in that the mixture, which... | 02/25/1992 |
| 5087724 | Substituted benzenes useful as intermediates A process for producing a 4-benzoyl-5-hydroxylpyrazole of the formula III: ##STR1## which comprises reacting carbon monoxide and a 5-hydroxypyrazole of the formula II: ##STR2## with a substituted benzene of the formula I: ##STR3## in t... | 02/11/1992 |
| 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 a catalyst comprising sulfuric acid supported on a carrie... | 07/09/1991 |
| 5004846 | Process for producing nitrobenzenes Nitrobenzenes are prepared by nitrating benzenes in a vapor phase with dilute or concentrated nitric acid wherein the following (A) or (B) is used as a catalyst: (A) acidic sheet clay minerals ion-exchanged with polyvalent metals, or (B) acidic composite oxide... | 04/02/1991 |
| 4978769 | Process for introducing fluorine atoms into aromatic rings by nucleophilic exchange Aromatic, ring-fluorinated compounds are particularly advantageously prepared by nucleophilic exchange in the course of reaction wih potassium fluoride in the presence of phase transfer catalysts and, if desired, solvents by carrying out the reaction in t... | 12/18/1990 |
| 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 |
| 4973771 | Phase transfer catalysts N-secondary-alkyldiorganoaminopyridinium salts are disclosed which are useful as phase transfer catalysts for facilitating preparation of fluoroaromatic compounds (such as fluoronitrobenzene compounds) from the corresponding chloroaromatic compounds (such... | 11/27/1990 |
| 4973772 | Catalytic method for producing fluoroarmatic compounds using substituted pyridinium salts A process is disclosed for preparing fluoroaromatic compounds (such as fluoronitrobenzene compounds) by reaction of corresponding chloroacromatic compounds (such as chloronitrobenzene compounds) with alkali metal fluoride salts in the presence of alkyldio... | 11/27/1990 |
