Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7358399 | Process for the preparation of N,N-diisopropyl-3-(2-hydroxy-5-methylphenyl)-3-phenyl-propaneamine A process is described for the preparation of N,N-diisopropyl-3-(2-hydroxy-5-methylphenyl)-3-phenyl-propaneamine comprising substitution of the sulfonyloxy group of the compound of the formula in which the substituents R an... | 04/15/2008 |
| 7312331 | Stable cyclic (alkyl)(amino) carbenes as ligands for transition metal catalysts Stable carbene ligands are provided having a carbene center flanked by a quaternary carbon and an amino group, and having utility in the preparation of various transition metal complexes. ... | 12/25/2007 |
| 7186864 | Glucocorticoid mimetics, methods of making them, pharmaceutical compositions, and uses thereof A compound of Formula (IA) or Formula (IB) wherein R1, R2, R3, R4, R5, R6, R7, and R8 are as defined herein, or a tautomer, ... | 03/06/2007 |
| 7053246 | Preparation of a symmetrical secondary amine Process for preparing a symmetrical secondary amine by reaction of a primary amine in the presence of hydrogen and a catalyst whose preparation has involved precipitation of catalytically active components onto monoclinic, tetragonal or cubic zirconium dioxide. ... | 05/30/2006 |
| 7005449 | Tolterodine salts The present invention concerns novel pharmaceutically active compounds, pharmaceutical compositions containing the same, the compounds for use as medicaments, and use of the compounds for the manufacture of specific medicaments. The present invention also concerns a... | 02/28/2006 |
| 6953866 | Process for preparing ortho substituted phenylamines A process is disclosed for preparing ortho substituted phenylamines comprising contacting phenylhydroxylamine, optionally substituted with at least one inert substituent, with a nucleophilic reagent in the presence of a manganese oxide at a temperature between about... | 10/11/2005 |
| 6933409 | Amination of aromatic hydrocarbons and heterocyclic analogs thereof Noble metal/reducible metal oxide catalysts effective for the direct amination of aromatic hydrocarbons and heterocyclic analogs thereof are disclosed. In one embodiment, the cataloxidant comprises a noble metal selected from Pd, Rh, Ir and/or Ru and a reducible met... | 08/23/2005 |
| 6822128 | Flow control in a three-phase monolithic catalyst reactor A method is disclosed for maintaining a volumetric gas to liquid ratio in a segmented gas/liquid flow along a reactor of monolithic catalyst beds in series. The present invention includes the steps of: initiating the segmented gas/liquid flow at a first end of the r... | 11/23/2004 |
| 6723880 | Preparation of secondary amines from primary amines A process for producing secondary amines of the formula R1R2N—A—NH—A—NR1R2, where R1 and R2 are linear or branched C1-20-alkyl radicals, optionally substituted with from 1 to 5 phen... | 04/20/2004 |
| 6646163 | Method for producing high purity xylylenediamine In a method for producing xylylenediamine by hydrogenating phthalonitrile separated from a gas produced by causing xylene to react with ammonia and oxygen-containing gas in the presence of a catalyst, (1) the gas is brought into contact with an organic so... | 11/11/2003 |
| 6476269 | Method for producing xylylenediamine A method for producing xylylenediamine by hydrogenating phthalonitrile synthesized through ammoxidation of xylene, wherein phthalonitrile is trapped in an organic solvent (A) by bringing a gas produced through ammoxidation into direct contact with the org... | 11/05/2002 |
| 6387545 | Organic hole transporting and blue light emitting electroluminescent materials A tertiary amine imparted quaterphenyl compound represented by the following formula: ##STR1## where R1 and R2, which can be different or the same, are hydrogen, C1 -C5 alkyl, or C6 -C12 ar... | 05/14/2002 |
| 6316673 | Process for producing aminodiphenylamines The present invention relates to the production of aminodiphenyl-amines resulting in good yields and high purity levels when aromatic amines are reacted with nitrohalobenzenes in the presence of a palladium catalyst and a base and the product thus obtaine... | 11/13/2001 |
| 6235871 | Synthesis of oligoarylamines, and uses and reagents related thereto The transition metal-catalyzed amination of aryl halides, in conjunction with an orthogonal protective group scheme, forms the basis of two routes to oligoaniline precursors. The oligoaniline precursors are soluble in a variety of common organic solvents,... | 05/22/2001 |
| 6222073 | Catalytic synthesis of N-alkylated anilines from olefins and anilines Process for the preparation of an N-arylethylaniline of the formula (I) Ar--N(R1)2-n (CHR2 CHR3 Ar')n (I) by reacting an aromatic olefin of the formula (II) Ar'CR3 =CHR2 (II) with an aniline ... | 04/24/2001 |
| 6166234 | Tripodal cyclopentadiene derivatives and their use Novel tripodal cyclopentadiene derivatives have the formula (I) ##STR1## where E are identical or different and are --N(R)(R), --P(R)(R), --As(R)(R), --Sb(R)(R), --OR, --SR, --SeR, --TeR, where R are identical or different and are each hydrogen, a C | 12/26/2000 |
| 6143934 | Preparation of amines from olefins over boron beta-zeolites In a process for preparing amines of the general formula I ##STR1## where R1, R2, R3, R4, R5, R6 are hydrogen, C1 -C20 -alkyl, C2 -C20 -alkenyl, ... | 11/07/2000 |
| 6137010 | Method for preparing 4-nitrodiphenylamine and 4-nitrosodiphenylamine from carbanilide This invention relates to a process for preparing 4-nitrodiphenylamine and 4-nitrosodiphenylamine to be used for 4-aminodiphenylamine as an intermediate of antiozonant, wherein carbanilide is reacted with nitrobenzene in the presence of an appropriate bas... | 10/24/2000 |
| 6107521 | Process for the preparation of secondary amines N,N-disubstituted amines in which the amino nitrogen atom is bound to the carbon atom of an aromatic ring disubstituted in the positions ortho to the carbon atom, are prepared by allowing a primary amine and a compound in which an ortho, ortho-disubstitut... | 08/22/2000 |
| 6100398 | Transition metal-catalyzed process for preparing N-aryl amine compounds Disclosed is a process for the preparation of N-aryl amine compounds, comprising reacting an amine compound with an arylating compound in the presence of a base and a transition metal catalyst under reaction conditions effective to form an N-aryl amine co... | 08/08/2000 |
| 6069277 | Amination of electrophilic aromatic compounds by vicarious nucleophilic substitution The present invention relates to a process to aminate electrophilic aromatic compounds by vicarious nucleophilic substitution of hydrogen using quaternary hydrazinium salts. The use of trialkylhydrazinium halide, e.g., trimethylhydrazinium iodide, as well... | 05/30/2000 |
| 6046359 | Catalysts for the amination of alkylene oxides, alcohols, aldehydes and ketones A catalyst comprises, based on the total weight of the catalyst, 0.1-6% by weight of cobalt, nickel or a mixture thereof, 0.001-25% by weight of ruthenium, 0-10% by weight of copper and 0-5% by weight of promoters on a porous metal oxide carrier. It preferably comprises... | 04/04/2000 |
| 5929281 | Process for producing heterocyclic aromatic amine or arylamine A heterocyclic aromatic halide or an aryl halide is reacted with an amine compound in the presence of a base to give a heterocyclic aromatic amine or an arylamine, respectively. In this reaction, a catalyst comprising a palladium compound and a tertiary p... | 07/27/1999 |
| 5922914 | Process to prepare tolterodine Disclosed is a novel intermediate, 3,4-dihydro-6-methyl-4-phenyl-2H-benzopyran-2-ol (IV) ##STR1## and an improved process for the preparation of tolterodine.... | 07/13/1999 |
| 5902901 | Arylamine processes A process for the preparation of N,N-bis(3,4-dimethylphenyl)-4-biphenylamine which comprises the reaction of N,N-bis(3,4-dimethylphenyl)amine and an iodobiphenyl in the presence of a ligand copper catalyst, and wherein the ligand is selected from the ... | 05/11/1999 |
| 5902900 | Optically active 1-phenyl-2-substituted propane derivatives and methods of producing the same An (S)-1-phenyl-2-substituted propane derivative shown by the following formula (I) ##STR1## wherein R1 and R2 represent a lower alkyl group, etc., or R1 and R2 may form together an alkylene group, etc.; R | 05/11/1999 |
| 5900508 | Preparation of amines from olefins over zeolites of the type PSH-3, MCM-22, SSZ-25 or mixtures thereof A process for the preparation of amines by reacting an olefin with ammonia or a primary or secondary amine at a temperature of from 200 to 350° C. and a pressure of from 100 to 300 bar in the presence of at least one zeolite having the specific structure... | 05/04/1999 |
| 5861535 | Reductive alkylation process to prepare tertiary aminoaryl compounds Tertiary aminoaryl compounds, such as N,N'dialkylaminoaryl compounds, are prepared using successive reductive steps without isolation therebetween, at high temperature and pressure. A nitroaryl compound is reduced using a ketone as both solvent and reacta... | 01/19/1999 |
| 5840981 | Process for producing N-methyl-2(3,4 dimethoxyphenyl)-ethylamine A process for preparing N-methyl-2-(3,4-dimethoxyphenyl)-ethylamine comprises hydrogenating 3,4-dimethoxyphenylacetonitrile with a methylamine of the general formula I ##STR1## where R1 is hydrogen, benzyl or tert-butyl, and hydrogen in th... | 11/24/1998 |
| 5723671 | Arylamine processes A process for the preparation of N,N-bis(3,4-dimethylphenyl)-4-biphenylamine which comprises the reaction of an aminobiphenyl and an iodoxylene in the presence of a ligand copper catalyst, and wherein the ligand is selected from the group consisting of ... | 03/03/1998 |
| 5705697 | Arylamine processes A process for the preparation of N,N-bis(3,4-dimethylphenyl)-4-biphenylamine which comprises the reaction of N-(3,4-dimethylphenyl)-4-biphenylamine and an iodoxylene in the presence of a ligated copper catalyst, and wherein the ligand is selected fro... | 01/06/1998 |
| 5684203 | Process for the preparation of nitro-substituted arylamines Nitroaromatics can be aminated using urea in the presence of bases and oxygen.... | 11/04/1997 |
| 5639718 | Multifunctional viscosity modifiers for lubricating oil compositions with improved dispersancy and antioxidancy derived from adducts of quinone An oil-soluble lubricating oil and fuel additive, useful as a multifunctional viscosity modifier comprising succinimide and other amine-containing polymers reacted with a quinone or substituted quinone adducts. Suitable polymers are those containing prima... | 06/17/1997 |
| 5633406 | Vicarious nucleophilic substitution using 4-amino-1,2,4-triazole, hydroxylamine or O-alkylhydroxylamine to prepare 1,3-diamino-2,4,6-trinitrobenzene or 1,3,5-triamino-2,4,6-trinitrobenzene The present invention relates to a process to produce 1,3-diamino-2,4,6-trinitrobenzene (DATB) or 1,3,5-triamino-2,4,6,-trinitrobenzene (TATB) by: (a) reacting at ambient pressure and a temperature of between about 0° and 50° C. for between about 0.1 an... | 05/27/1997 |
| 5616799 | Process for the preparation of glycoloylanilides A process for the preparation of glycoloylanilide of the formula (G) ##STR1## is recited that involves reacting a nitrobenzene with hydrogen and, if desired, with a carbonyl compound, in the presence of a noble metal catalyst and a solvent, reacting ... | 04/01/1997 |
| 5616810 | Process for the preparation of deactivated anilines The present invention is directed to a process for the preparation of deactivated anilines, which comprises the step of reacting a compound of formula ( I ) ##STR1## with a dialkylamide in the presence of a base at elevated temperature, in which... | 04/01/1997 |
| 5576460 | Preparation of arylamines A method of preparing an arylamine compound includes reacting a metal amide comprising a metal selected from the group consisting of tin, boron, zinc, magnesium, indium and silicon, with an aromatic compound comprising an activated substituent in the pres... | 11/19/1996 |
| 5576274 | Fuel and lubricant additives derived from dihydroxy-aromatic compounds The present invention relates to a novel process for the production of fuel and lubricant additives useful as dispersants and multifunctional viscosity modifiers wherein a dihydroxyaromatic compound is alkylated with an olefinic polymer and then aminated ... | 11/19/1996 |
| 5466871 | Process for preparing nitroaniline derivatives A process for preparing a nitroaniline derivative comprising a step of reacting an aromatic nitro compound with an O-alkylhydroxylamine or a salt thereof in the presence of a base and optionally a metallic catalyst, which process is industrially advantage... | 11/14/1995 |
| 5451702 | Process for preparing substituted aromatic amines A process for preparing substituted aromatic amines is provided which comprises contacting a nucleophilic compound and an azo containing compound in the presence of a suitable solvent system, reacting the nucleophilic compound and the azo containing compo... | 09/19/1995 |