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:
Aug. 15, 1995
Filed:
Jan. 18, 1994
Kan Takamine, Oita, JP;
Michio Yamato, Oita, JP;
Akira Murakami, Oita, JP;
Tooru Tokumaru, Oita, JP;
Yoshinori Nakayama, Ibaraki, JP;
Motoo Hazama, Oita, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
There is disclosed a process for producing an aromatic amide compound of the general formula (4), including the steps of subjecting an o-nitrophenol compound of the general formula (1) to catalytic reduction in acetone or an aromatic hydrocarbon solvent under the presence of a nickel catalyst to give an o-aminophenol compound of the general formula (2); and (b) subjecting the o-aminophenol compound of the general formula (2) to condensation with an acid chloride compound having a sulfur content of 0.5% or less, based on the weight of the acid chloride compound, of the general formula (3) in acetone or an aromatic hydrocarbon solvent under an atmosphere of an inert gas having an oxygen concentration of 1% or less. The acid chloride compound having a sulfur content of 0.5% or less, based on the weight of the acid chloride compound, of the general formula (3) may be obtained by allowing a carboxylic acid compound of the general formula (5) to react with thionyl chloride and by concentrating the reaction mixture. Also disclosed is another process for producing an aromatic amide compound of the general formula (4), including the step of subjecting an o-aminophenol hydrochloride salt of the general formula (6) to condensation with an acid chloride compound having a sulfur content of 0.8% or less, based on the weight of the acid chloride compound, of the general formula (3) in an inert solvent.