Cyclic anhydrides (i.e., -C(=X)OC(=X)-, wherein the X's are the same or diverse chalcogens, is part of the hetero ring)
Subclass of:
549 - Organic compounds -- part of the class 532-570 series
549000000 - ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1)
549000000 - 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)
549200000 - Oxygen containing hetero ring (e.g., dioxirane, etc.)
Patent class list (only not empty are listed)
Deeper subclasses:
Class / Patent application number | Description | Number of patent applications / Date published |
---|---|---|
549233000 | The cyclic anhydride is five-membered (e.g., succinic anhydride, etc.) | 92 |
549232000 | The cyclic anhydride has at least six members and is a cyclo in a polycyclo ring system | 3 |
20090012318 | Cage-shaped cyclobutanoic dianhydrides and process for production thereof - A process which comprises reacting a 1,2,3,4-cyclobutanetetracarboxylic-1,2:3,4-dianhydride [1] with an alcohol [2] in the presence of an acid catalyst to obtain a compound [3], isomerizing the compound [3] with a base catalyst into a compound [4], reacting the compound [4] with an organic acid to obtain a compound [5], and reacting the compound [5] with a dehydrating agent to obtain a 1,2,3,4-cyclobutanetetracarboxylic-1,3:2,4-dianhydride: wherein R | 01-08-2009 |
20090023937 | 9-CYANO-SUBSTITUTED PERYLENE-3,4-DICARBOXYLIC ACID MONOIMIDES - The current invention relates to a perylene-3,4-dicarboxylic anhydride, substituted in the 9-position, of the general formula III | 01-22-2009 |
20100317876 | TERRYLENE AND QUATERRYLENE DERIVATIVES - Rylene derivatives of the general formula I | 12-16-2010 |
Entries | ||
Document | Title | Date |
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20090069578 | Novel asymmetric synthesis of (S)-(+)-3-(aminomethyl)-5-methylhexanoic acid - The invention encompasses processes for the synthesis of (S)-(+)-3-(aminomethyl)-5-methylhexanoic acid, (S)-Pregabalin, and intermediates of (S)-Pregabalin. | 03-12-2009 |
20090318712 | CATALYST SYSTEM AND METHOD FOR PRODUCING CARBOXYLIC ACIDS AND/OR CARBOXYLIC ACID ANHYDRIDES - Catalyst systems for preparing carboxylic acids and/or anhydrides, the catalyst system comprising a reaction zone and a layered catalyst, the reaction zone comprises a gas inlet region and a gas outlet region, the layered catalyst comprises an active composition and one or more middle layers, one or more first layers disposed on a side of the one or more middle layers toward the gas inlet region, and one or more second layers on a side of the one or more middle layers toward the gas outlet region, wherein the active composition content of one or more of the middle catalyst layers, based on total mass of the layered catalyst, is lower than the active composition content of the one or more first catalyst layers and is lower than one or more second catalyst layers; and processes for gas phase oxidation employing a layered catalyst of the present invention. | 12-24-2009 |
20090318713 | PROCESS FOR MANUFACTURING A CYCLIC DIESTER OF AN A-HYDROXY ACID - Process for manufacturing a cyclic diester of an α-hydroxy acid comprising the following steps: | 12-24-2009 |
20100324307 | NOVEL ASYMMETRIC SYNTHESIS OF (S)-(+)-3-(AMINOMETHYL)-5-METHYLHEXANOIC ACID - The invention encompasses processes for the synthesis of (S)-(+)-3-(aminomethyl)-5-methylhexanoic acid, (S)-Pregabalin, and intermediates of (S)-Pregabalin. | 12-23-2010 |