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:
Jun. 03, 2003
Filed:
Jun. 14, 2002
Applicant:
Inventors:
Assignee:
Ube Industries, Ltd., Yamaguchi-ken, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
C07C / ;
Abstract
3,4-dihydroxybenzonitrile useful as a starting compound for synthesis of medicines and agricultural chemicals is produced, with a high yield by chlorinating 3,4-methylenedioxybenzonitrile with sulfuryl chloride or a mixture of molecular chlorine with a chlorination-promoter including phosphorus trichloride, phosphorus pentachloride, sulfuryl chloride, thionyl chloride, and/or nitrosyl chloride, to prepare 2-chloro-benzo[1,3]dioxole-5-carbonitrile, and hydrolyzing 2-chloro-benzo[1,3]dioxole-5-carbonitrile by contacting it with water to produce 3,4-dihydroxybenzonitrile.