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Class Information
Number: 549/508
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) or nitrogen as the only ring hetero atoms (class 540, subclass 1) > Oxygen containing hetero ring (e.g., dioxirane, etc.) > The hetero ring is five-membered > Preparing from compound containing -coo- group
Description: Processes wherein the five-membered hetero ring is prepared from a compound that contains a -C-O- group.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8598372 Method for producing cyclicised compounds from organic acids having from 4 to 6 carbon atoms Dec. 3, 2013
8536351 2-aryl-5-heterocyclyl-cyclohexane-1,3,dione compounds and their use as herbicides Sep. 17, 2013
8466300 Processes for the production of hydrogenated products Jun. 18, 2013
8399687 Processes for the production of hydrogenated products Mar. 19, 2013
8193375 Processes for the production of hydrogenated products Jun. 5, 2012
8084626 Processes for the production of hydrogenated products Dec. 27, 2011
7935834 Catalysts for maleic acid hydrogenation to 1,4-butanediol May. 3, 2011
7902386 Method for the depolymerization of mixtures that contain mono-and/or diesters of polytetrahydrofurane Mar. 8, 2011
7598404 Process for the production of ethers Oct. 6, 2009
RE39794 Process for the simultaneous production of maleic anhydride and its hydrogenated derivatives Aug. 21, 2007
7214641 Catalyst and hydrogenation of carbonyl compounds in the liquid phase using the catalyst May. 8, 2007
7193091 Method for the simultaneous production of tetrahydrofurans and pyrrolidones Mar. 20, 2007
6989455 Two-stage process for the hydrogenation of maleic acid to 1,4-butanediol Jan. 24, 2006
6958404 Method for the hydrogenation of maleic anhydride and related compounds in a fluid bed reactor Oct. 25, 2005
6936727 Process for the production of ethers, typically thf Aug. 30, 2005
6888011 Porous catalyst for the hydrogenation of maleic anhydride to tetrahydrofuran May. 3, 2005
6844452 Process for the co-production of aliphatic diols and cyclic ethers Jan. 18, 2005
6831182 Method for the hydrogenation of maleic anhydride and related compounds in two serial reaction zones Dec. 14, 2004
6756501 Manufacture of 3-methyl-tetrahydrofuran from alpha-methylene-gamma-butyrolactone in a single step process Jun. 29, 2004
6730800 Method for the production of tetrahydrofuran May. 4, 2004
6700003 Process for producing a saturated cyclic ether Mar. 2, 2004
6673946 Manufacture of 3-methyl-tetrahydrofuran from 2-methyl-gamma-butyrolactone Jan. 6, 2004
6670300 Textured catalysts, methods of making textured catalysts, and methods of catalyzing reactions conducted in hydrothermal conditions Dec. 30, 2003
6670490 Platinum-rhenium-tin catalyst for hydrogenation in aqueous solution Dec. 30, 2003
6664402 Manufacture of 3-methyl-tetrahydrofuran from alpha-methylene-gamma-butyrolactone in a two step process Dec. 16, 2003
6620949 Process for the simultaneous production of maleic anhydride and its hydrogenated derivatives Sep. 16, 2003
6566539 Catalyst regeneration by treatment with an oxidizing agent May. 20, 2003
6521765 Process for the preparation of 3-methyltetrahydrofuran Feb. 18, 2003
6489493 Acyclic chiral derivatives of hibiscus acid and the process of preparing the same Dec. 3, 2002
6479704 Hydrogenation with monolith reactor under conditions of immiscible liquid phases Nov. 12, 2002
6433193 Process to afford gamma butyrolactone and tetrahydrofuran Aug. 13, 2002
6355814 Process for the preparation of 3-hydroxymethyl tetrahydrofuran Mar. 12, 2002
6316640 Preparation of tetrahydrofuran Nov. 13, 2001
6288245 Process for the production of tetrahydrofuran and gammabutyrolactone Sep. 11, 2001
6248906 Process for the production of tetrahydrofuran, gammabutyrolactone and butanediol Jun. 19, 2001
6239292 Process for preparing gamma-butyrolactone, butane-1,4-diol and tetrahydrofuran May. 29, 2001
6225477 Process for regeneration of carbon-supported, rhenium-containing catalysts May. 1, 2001
6204395 Process for the preparation of butane-1,4-diol, .gamma.-butyrolactone and tetrahydrofuran Mar. 20, 2001
6191322 Process for the production of butanediol by liquid phase hydrogenation Feb. 20, 2001
6147233 Process for the preparation of 3-methyltetrahydrofuran Nov. 14, 2000
6100410 Process for the production of 1,4-butanediol, .gamma.-butyrolactone and tetrahydrofuran Aug. 8, 2000
6022984 Efficient synthesis of furan sulfonamide compounds useful in the synthesis of new IL-1 inhibitors Feb. 8, 2000
6008384 Method and Ru,Re,Sn/carbon catalyst for hydrogenation in aqueous solution Dec. 28, 1999
5990324 Process for producing 3-methyltetrahydrofuran Nov. 23, 1999
5969164 Catalysts for the hydrogenation of maleic acid to 1,4-butanediol Oct. 19, 1999
5892107 Method for the production of levulinic acid Apr. 6, 1999
5883266 Hydrogenated 5-carbon compound and method of making Mar. 16, 1999
5856531 Preparation of 3-methytetra-hydrofuran from 2,3-dihydrofuran Jan. 5, 1999
5792875 Catalytic production of butyrolactone or tetrahydrofuran Aug. 11, 1998
5698749 Catalysts for the hydrogenation of aqueous maleic acid to 1,4-butanediol Dec. 16, 1997

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