Process for the production of cyclic carbonic acid esters
Patent 5023346 Issued on June 11, 1991. Estimated Expiration Date: 
November 13, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 13, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3221025 3532715 Cyclic carbonic acid derivatives Carbonate treated dispersants Method for preparing cyclic polycarbonate oligomer mixtures Cyclic monocarbonate bishaloformates, method for their preparation, and uses thereof Poly (alkylene carbonate) polyahls having on the average up to one acid-terminal moiety and salts thereof Patent #: 4870127 InventorsAssigneeApplicationNo. 434443 filed on 11/13/1989US Classes:549/231, Cyclic anhydrides (i.e., -C(=X)OC(=X)-, wherein the X's are the same or diverse chalcogens, is part of the hetero ring)549/228, The hetero ring contains -O-C(=X)-O- as part of its structure, wherein X is chalcogen (e.g., cyclic carbonates, etc.)549/232, The cyclic anhydride has at least six members and is a cyclo in a polycyclo ring system549/233, The cyclic anhydride is five-membered (e.g., succinic anhydride, etc.)549/234Polycyclo ring system having the cyclic anhydride as one of the cyclosExaminersPrimary: Shen, CeciliaAttorney, Agent or FirmForeign Patent References
International ClassesC07D 317/04C07D 319/02 C07D 323/00 Foreign Application Priority Data1988-11-16 DEAbstractCyclic carbonic acid esters are produced by reaction of hydroxy compounds with phosgene in the presence of a heterocyclic compound containing at least one nitrogen atom as ring member in an aromatic ring.Other References
Field of SearchThe cyclic anhydride is five-membered (e.g., succinic anhydride, etc.)The hetero ring contains -O-C(=X)-O- as part of its structure, wherein X is chalcogen (e.g., cyclic carbonates, etc.) Preparing by oxidation Of benzene or hydrocarbyl substituted benzene Cyclic anhydrides (i.e., -C(=X)OC(=X)-, wherein the X's are the same or diverse chalcogens, is part of the hetero ring) The cyclic anhydride has at least six members and is a cyclo in a polycyclo ring system Polycyclo ring system having the cyclic anhydride as one of the cyclos |
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