Process for 1-phenyl-imidazoline-2,5-diones
Patent 5166358 Issued on November 24, 1992. Estimated Expiration Date: 
December 18, 2010. 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.
December 18, 2010. 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 2490813 3914311 1-Aryl-5-alkylidene,2,4-dioxo-imidazolidines and process therefor Treating immediate hypersensitivity conditions with 3,5-disubstituted hydantoin derivatives Process for preparing arylamines Herbicidal hydantoins Patent #: 4944791 InventorsAssigneeApplicationNo. 629490 filed on 12/18/1990US Classes:548/321.1Benzene ring bonded directly to the diazole ringExaminersPrimary: Brust, Joseph PaulAssistant: Gabilan, Mary Susan H. Attorney, Agent or FirmInternational ClassC07D 233/74Foreign Application Priority Data1989-12-22 FRAbstractA process for the preparation of a compound of the formula ##STR1## wherein R1, R2 and R3 are individually selected from the group consisting of hydrogen, alkyl and alkoxy of 1 to 7 carbon atoms, alkenyl, alkynyl, alkenyloxy and alkynyloxy of 2 to 7 carbon atoms, phenyl, phenoxy, --NO2, --CF3, acyl of 1 to 7 carbon atoms and esteri-fied carboxy and R4, R5 and R6 are individually hydrogen or alkyl of 1 to 7 carbon atoms comprising reacting a compound of the formula ##STR2## wherein R1, R2 and R3 have the above definitions and Hal is halogen with a compound of the formula ##STR3## wherein R4, R5 and R6 have the above definitions in the presence of a catalyst and optionally a solvent.Other References
Field of SearchWhich also contains benzene ring |
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