Lactones (i.e., -C(=X)O-, wherein X is chalcogen, 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
549295000	The lactone ring is five-membered	108
549273000	The lactone ring is six-membered	96
549266000	The lactone ring has at least seven members	46
549328000	Four-membered lactone ring formed	9
549264000	Spiro	6
549327000	Acyclic carbon double bonded directly to a ring carbon of a four-membered lactone ring	1
20150315163	DEVICE AND METHOD FOR CONTINUOUSLY PREPARING HIGH-PURITY AKD WITHOUT SOLVENT - Device and method for continuously preparing high-purity AKD without solvent includes a reactor making continuous mixing of raw materials. The process includes: the tertiary amine feeding into the reactor and the continuously feeding acyl chloride from three to ten line; under operating state, the motor rotates the internal cylinder in relation to external cylinder, forcing the fed materials to convey and stir in the conveying section of annular column passage, forcing the materials to shear and mix by movement of shearing and kneading blades. Arrangement of conveying and mixing sections along the axial direction of annular column passage, causes sufficient reaction of materials and controls the material temperature through internal and external heat exchange systems until the reaction products are discharged from outlet. The device and process disperse reaction heat and sufficient material mixture and complete reaction to control the reaction temperature, viscosity and decrease the generation of side reaction.	11-05-2015

Entries
Document	Title	Date
20080214842	Process For Purifying Hydroxycarboxylic Acid, Process For Producing Cyclic Ester, and Process For Producing Polyhydroxycarboxylic Acid - Disclosed is a process for purifying a hydroxycarboxylic acid, comprising: a crystallization step of subjecting a hydroxycarboxylic acid aqueous solution to crystallization for purification, a separation step of separating a hydroxycarboxylic acid crystal from a mother liquid, and a washing step of washing the hydroxycarboxylic acid crystal for further purification with a washing liquid, wherein the washing liquid is a hydroxycarboxylic acid aqueous solution. The purified or refined hydroxycarboxylic acid obtained through the above process is suitably used as a starting material for production of a polyhydroxycarboxylic acid. The above process is suitably included in a process for producing a cyclic ester and a process for producing a polyhydroxycarboxylic acid.	09-04-2008
20090137825	METHOD OF PRODUCING A CARBOXYLIC ALKYL ESTER - The present invention relates to a novel process for preparing alkyl polycarboxylates from an aqueous solution of an ammonium salt of the polycarboxylic acid by reactive distillation, and to a process for hydrogenating the alkyl carboxylates prepared in this way.	05-28-2009
20090287000	LOW PRESSURE CARBONYLATION OF HETEROCYCLES - Heterocycles, e.g., epoxides, are carbonylated at low pressure with high percentage conversion to cyclic, ring expanded products using the catalyst	11-19-2009
20100105928	METHODS FOR MASSIVE CULTURE OF DINOPHYSIS ACUMINATA AND ISOLATION OF PECTENOTOXIN-2 - Provided is a method for massive culture of	04-29-2010
20110218346	High Selectivity Hydrogen Bonding Polymeric Adsorbent and its Application on the Separation and Purification of Effective Constituents from Ginkgo Extract - Provided are a kind of high selectivity polymeric adsorbents with amide functional groups based on the hydrogen bonding interaction, which is prepared by adequately swelling a DVB-co-MA copolymer of 6% crosslinking degree as the initial resin with dimethyl formamide, performing an amination reaction by adding a diamine, soaking the dried resultant yellow resin with an acylating agent that is a dianhydride, and performing an acylation reaction to obtain the polymeric adsorbent with amide functional groups of the invention. The polymeric adsorbent of the invention can be used to effectively isolate and purify the active ingredients, i.e., flavones and lactones, from the extract of ginkgo leaf.	09-08-2011
20150057455	FLASH EVAPORATION FOR PRODUCT PURIFICATION AND RECOVERY - Methods and systems for producing high purity 3-hydroxypropionic acid (3-HP) from an aqueous medium, such as a fermentation broth, are described. Aqueous 3-HP solution can be purified by flash evaporation wherein the 3-HP is vaporized at an elevated temperature without conversion to acrylic acid. This process can be integrated with downstream processes for producing other chemical and consumer products.	02-26-2015