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| Number | Title | Issue Date |
| 7629474 | Process for preparing 2-oxo-1-pyrrolidine derivatives The present invention relates to a new process for preparing 2-oxo-I-pyrrolidine derivatives of general formula (I) wherein the substituents are as defined in the specification. ... | 12/08/2009 |
| 7465813 | Process for making 5-methyl-N-alkyl-2-pyrrolidone from alkyl amine(s) and levulinic acid This invention relates to a process for producing a reaction product comprising 5-methyl-N-alkyl-2-pyrrolidone by (a) reacting levulinic acid with alkyl amine(s) and (b) hydrogenating the products of step (a) in the presence of a metal catalyst, which is optionally ... | 12/16/2008 |
| 7271299 | Two-stage method for producing butanediol with intermediated separation of succinic anhydride Optionally alkyl-substituted 1,4-butanediol is prepared from C4-dicarboxylic acids and/or of derivatives thereof by: a) a gas stream of the C4-dicarboxylic acid or the derivative thereof in a first reactor in ... | 09/18/2007 |
| 7244852 | Process for preparing 2-methylpyrrolidine and specific enantiomers thereof The invention relates to a process for preparing 2-methylpyrrolidine and, more particularly, specific enantiomers of 2-methylpyrrolidine. Novel intermediates also are described. ... | 07/17/2007 |
| 7141679 | Process for making N-vinyl-2-pyrrolidone A process for making N-vinyl-2-pyrrolidone (NVP) is disclosed. The process comprises dehydrating N-(2-hydroxyethyl)-2-pyrrolidone (HEP) in the presence of a catalyst and added water. Adding an effective amount of water into the dehydration process reduces the amount... | 11/28/2006 |
| 7129362 | Production of 5-methyl-N-aryl-2-pyrrolidone and 5-methyl-N-alkyl-2-pyrrolidone by reductive of levulinic acid esters with aryl and alkyl amines This invention relates to a process for producing 5-methyl-N-aryl-2-pyrrolidone, 5-methyl-N-alkyl-2-pyrrolidone, and 5-methyl-N-cycloalkyl-2-pyrrolidone by reductive amination of levulinic acid esters with aryl or alkyl amines utilizing a metal catalyst, which is op... | 10/31/2006 |
| 7045639 | Method for purifying N-(2-hydroxyethyl)-2-pyrrolidone A method for purifying N-(2-hydroxyethyl)-2-pyrrolidone (HEP) is disclosed. The method comprises crystallizing crude HEP to produce HEP crystals and a mother liquor, and separating the HEP crystals from the mother liquor. In one method of the invention, crystallizat... | 05/16/2006 |
| 7002024 | Production of a N-aryl-2-lactam and N-cycloalkyl-2-lactam by reductive amination of lactones with aryl amines This invention relates to a process for producing N-aryl-2-lactams and N-cycloalkyl-2-lactams by reductive amination of lactones with aryl amines utilizing a metal catalyst, which is optionally supported. ... | 02/21/2006 |
| 6995275 | Production of N-aryl-2-lactam and N-alkyl-2-lactam by reductive amination of lactones with aryl and alkyl nitro compounds This invention relates to a process for producing N-aryl-2-lactams, N-alkyl-2-lactams, and N-cycloalkyl-2-lactams by reductive amination of lactones with aryl or alkyl nitro compounds utilizing a metal catalyst, which is optionally supported. ... | 02/07/2006 |
| 6992195 | Production of N-aryl-2-lactam and N-cycloalkyl-2-lactam by reductive amination of lactones with arylamines This invention relates to a process for producing N-aryl-2-lactams and N-cycloalkyl-2-lactams by reductive amination of lactones with aryl amines utilizing a metal catalyst, which is optionally supported. ... | 01/31/2006 |
| 6987192 | Production of N-aryl-2-lactam and N-alkyl-2-lactam by reductive amination of lactones with aryl and alkyl nitro compounds This invention relates to a process for producing N-aryl-2-lactams, N-alkyl-2-lactams, and N-cycloalkyl-2-lactams by reductive amination of lactones with aryl or alkyl nitro compounds utilizing a metal catalyst, which is optionally supported. ... | 01/17/2006 |
| 6984736 | Production of N-aryl-2-lactam and N-alkyl-2-lactam by reductive amination of lactones with aryl and alkyl nitro compounds This invention relates to a process for producing N-aryl-2-lactams, N-alkyl-2-lactams, and N-cycloalkyl-2-lactams by reductive amination of lactones with aryl or alkyl nitro compounds utilizing a metal catalyst, which is optionally supported. ... | 01/10/2006 |
| 6982339 | Production of N-aryl-2-lactam and N-cycloalkyl-2-lactam by reductive amination of lactones with aryl amines This invention relates to a process for producing N-aryl-2-lactams and N-cycloalkyl-2-lactams by reductive amination of lactones with aryl amines utilizing a metal catalyst, which is optionally supported. ... | 01/03/2006 |
| 6958404 | Method for the hydrogenation of maleic anhydride and related compounds in a fluid bed reactor C4-dicarboxylic acids or derivatives thereof are hydrogenated in the gas phase in a fluidized-bed reactor. It is possible to use catalyst compositions known per se. ... | 10/25/2005 |
| 6900337 | Production of 5-methyl-1-hydrocarbyl-2-pyrrolidone by reductive amination of levulinic acid This invention relates to a process for producing 5-methyl-1-R-2-pyrrolidone or 5-methyl-2-pyrrolidone, wherein R is a hydrocarbyl or substituted hydrocarbyl, by reductive amination of levulinic acid utilizing a metal catalyst, which may be optionally supported.... | 05/31/2005 |
| 6855731 | Production of 5-methyl-N-aryl-2-pyrrolidone and 5-methyl-N-alkyl-2-pyrrolidone by reductive amination of levulinic acid esters with nitro compounds This invention relates to a process for producing 5-methyl-N-aryl-2-pyrrolidone, 5-methyl-N-cycloalkyl-2-pyrrolidone, and 5-methyl-N-alkyl-2-pyrrolidone by reductive amination of levulinic acid esters with nitro compounds utilizing a metal catalyst, which is optiona... | 02/15/2005 |
| 6828277 | Production of N-aryl-2-lactam and N-alkyl-2-lactam by reductive amination of lactones with aryl and alkyl nitro compounds This invention relates to a process for producing N-aryl-2-lactams, N-alkyl-2-lactams, and N-cycloalky-2-lactams by reductive amination of lactones with aryl or alkyl nitro compounds utilizing a metal catalyst, which is optionally supported. ... | 12/07/2004 |
| 6828278 | Production of N-aryl-2-lactam and N-cycloalkyl-2-lactam by reductive amination of lactones with arly amines This invention relates to a process for producing N-aryl-2-lactams and N-cycloalkyl-2-lactams by reductive amination of lactones with aryl amines utilizing a metal catalyst, which is optionally supported. ... | 12/07/2004 |
| 6706893 | Methods of making pyrrolidones The present invention provides methods for making N-methylpyrrolidine and analogous compounds via hydrogenation. Novel catalysts for this process, and novel conditions/yields are also described. Other process improvements may include extraction and hydrolysis steps.... | 03/16/2004 |
| 6492532 | Method for producing carbonyl compound by dehydrogenating alcohol The present invention provides a method for producing a carbonyl compound by dehydrogenating an alcohol. Namely, it relates to a method for producing a carbonyl compound, which comprises dehydrogenating an alcohol in the presence of a complex compound cat... | 12/10/2002 |
| 6350883 | Method for preparing lactam The present invention is related to a method for preparing lactam represented by the following formula: ##STR1## wherein R is C2-10 alkylene which may be optionally substituted with C1-6 alkyl or phenyl; R' is a hydrogen atom, C... | 02/26/2002 |
| 6153766 | Method of producing 4-hydroxy-2-pyrrolidinone and method of purifying the same 4-Hydroxy-2-pyrrolidinone which is useful as a raw material of drugs can be produced rapidly and highly selectively in a high yield from an optically active or recemic 4-amino-3-hydroxybutylic acid derivative or a 4-azido-3-hydroxybutyric acid derivative ... | 11/28/2000 |
| 6008375 | Process for manufacturing 2-pyrrolidone or N-alkylpyrrolidones A process for manufacturing gamma-butyrolactone by the catalytic hydrogenation of maleic anhydride, succinic anhydride or their acids in the vapor phase in the presence of catalysts based on copper oxide and aluminum oxide in reduced form is described. Th... | 12/28/1999 |
| 5912358 | Process for preparing 2-pyrrolidones 2-Pyrrolidones can be prepared by simultaneous reaction of maleic acid, ammonia or a primary amine and hydrogen at elevated temperature and elevated pressure in the liquid phase over a supported catalyst, with the supported catalyst containing both pallad... | 06/15/1999 |
| 5801252 | Process for production of cyclic N-vinyl carboxylic acid amide There is provided a process for producing a cyclic N-vinyl carboxylic acid amide stably in safety and low cost, using, as starting raw materials, a cyclic carboxylic acid ester and monoethanolamine both available inexpensively and easily. The process comp... | 09/01/1998 |
| 5641881 | Preparation of N-alkenylcarboxamides Preparation of N-alkenylcarboxamides of the general formula I ##STR1## where at least one of the radicals R1 is hydrogen and the second radical R1 is hydrogen or a C1 -C4 -alkyl group, the radical R2 | 06/24/1997 |
| 5502185 | Preparation of lactams Cyclic lactams are prepared by reacting an aminocarboxylic acid compound of the formula I H2 N--(CH2)m --COR1 I where R1 is --OH, --O--C1 -C12 -alkyl or --NR2... | 03/26/1996 |
| 5478950 | Process for producing pyrrolidone and N-alkyl pyrrolidones The invention relates to a process for producing pyrrolidone and N-alkyl pyrrolidones from saturated or unsaturated 1,4-dicarboxylic acids or their anhydrides, hydrogen, and a primary amine, characterized in that the dicarboxylic acid or its anhydride is ... | 12/26/1995 |
| 5434273 | Preparation of N-substituted 2-pyrrolidones The preparation of N-substituted 2-pyrrolidones (I) by the reaction of maleic acid, fumaric acid, or succinic acid or functional derivatives of these acids (compounds II) with a primary amine (III) or by the reaction of amides or imides derived from II an... | 07/18/1995 |
| 5393888 | Non-catalytic liquid phase conversion of butyrolactone and ammonia to 2-pyrrolidone product in high yield and selectivity This invention relates to a liquid phase process for producing 2-pyrrolidone in high yield and selectivity in the absence of catalyst and extraneous solvents which involves contacting ammonia with butyrolactone in a molar ratio of from 0.5:1 to 0.85:1 at ... | 02/28/1995 |
| 5298628 | Process for the production of optically active 4-aryl-2-pyrrolidinones Stereoselective process for the production of (4R)- or (4S)-4-aryl-2-pyrrolidinones as well as intermediate products and the stereoselective process for the production of the optically active intermediate compounds.... | 03/29/1994 |
| 5276165 | Preparation of N-substituted lactams A process for the preparation of N-substituted lactams of the formula I ##STR1## where Z is C2 - to C10 -alkylene, C7 - to C12 -aralkylene, phenylene or naphthylene, and R1 is C1 - to C | 01/04/1994 |
| 5157127 | Preparation of N-substituted pyrrolidones A process for the preparation of N-substituted pyrrolidones by the catalytic hydrogenation of maleic anhydride, maleic acid and/or fumaric acid in the presence of a primary amine and a solvent, at elevated temperature and pressure, wherein a catalyst is u... | 10/20/1992 |
| 5142066 | Stereoselective process for the preparation of 2-amino-ethanol derivatives having a central analgesic activity and intermidiates thereof A stereoselective process for the preparation of the compounds of formula ##STR1## wherein R, R1, R2, a and b have the meanings reported in the specification, is described. The compounds of formula I have a remarkable central analges... | 08/25/1992 |
| 5101045 | Preparation of N-substituted pyrrolidones A process for the preparation of N-substituted pyrrolidones by catalytic hydrogenation of maleic anhydride, maleic acid and/or fumaric acid in the presence of ammonia uses at least stoichiometric amounts of a primary alcohol or of an aldehyde and uses a c... | 03/31/1992 |
| 5091567 | Process for the preparation of 1-aminomethyl-1-cyclohexaneacetic acid The instant invention concerns a novel process for the preparation of 1-aminomethyl-1-cyclohexaneacetic acid (gabapentin), a known compound useful for treating certain cerebral diseases such as epilepsy and dizziness.... | 02/25/1992 |
| 4904804 | Preparation of 2-pyrrolidone Process is disclosed for the one reaction step preparation of 2-pyrrolidone by contacting with hydrogen, ammonia, at least one diluent and a catalyst consisting essentially of palladium on alumina; wherein the molar ratio of ammonia to succinic acid on su... | 02/27/1990 |
| 4885371 | Process for the preparation of purified N-alkyl lactams The present invention relates to a process for the selective preparation of an N-alkyl lactam having minimal coloration by reacting the corresponding lactone with an alkyl amine in the presence of a catalytic amount of an ammonium, alkali metal or alkalin... | 12/05/1989 |
| 4824967 | Process for the preparation of 2-pyrrolidone This invention relates to an improved process for reacting butyrolactone and ammonia which comprises conducting the reaction in the vapor phase in the presence of a magnesium silicate catalyst to selectively produce 2-pyrrolidone in higher yield and purit... | 04/25/1989 |
| 4814464 | Process for making N-alkylpyrrolidones An improved process for making N-alkylpyrrolidones from a maleic derivative or a succinic derivative which involves catalytically reducing the maleic derivative with hydrogen to succinic anhydride, if the maleic derivative is the starting point, convertin... | 03/21/1989 |
