The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 2011
Filed:
Apr. 06, 2006
Hiroshi Koyano, Kamakura, JP;
Hitoshi Iikura, Kamakura, JP;
Yoshiaki Isshiki, Kamakura, JP;
Yasunori Kohchi, Kamakura, JP;
Hiroshi Koyano, Kamakura, JP;
Hitoshi Iikura, Kamakura, JP;
Yoshiaki Isshiki, Kamakura, JP;
Yasunori Kohchi, Kamakura, JP;
Chugai Seiyaku Kabushiki Kaisha, Tokyo, JP;
Abstract
The invention provides a process for production of 2,3,4-trifluoro-5-(iodo or bromo)benzoic acid, the process comprising a halogenation step in which direct iodination or bromination of 2,3,4-trifluorobenzoic acid is performed with an iodinating agent or brominating agent in a reaction solvent in the presence of an oxidizing agent. According to the invention, there is provided a process for convenient production of 2,3,4-trifluoro-5-(iodo or bromo)benzoic acid in high yield and high purity in a highly regioselective manner.