Synthesis of vicinal difluoro aromatics and intermediates thereof
Patent 6455744 Issued on September 24, 2002. Estimated Expiration Date: 
November 6, 2021. 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 6, 2021. 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 ReferencesProcess for the preparation of aromatic fluoro compounds Fluorination process Method of preparing fluoroaromatic compounds Patent #: 6008407 InventorsAssigneeApplicationNo. 985786 filed on 11/06/2001US Classes:570/143Preparing benzene ring containing compoundExaminersPrimary: Higel, Floyd D.Assistant: Shameem, Golam M. M. Attorney, Agent or FirmInternational ClassC07C 025/22AbstractA method of preparing vicinal difluoro aromatic compounds in high yield from hydroxy aromatic compounds and a method of preparing intermediates thereof. The hydroxy aromatic compound can be a mono-, bi- or tricyclic aromatic in which the rings are separate or fused. One or more of the rings can contain heteroatoms, such as oxygen, nitrogen, or sulfur, and can contain one or more substitutions, in addition to the hydroxy substitution.Other References
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