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:
Nov. 12, 2002
Filed:
Mar. 18, 2002
Gangadasu Banda, Andhra Pradesh, IN;
Chinaraju Bhimapaka, Andhra Pradesh, IN;
Vaidya Jayathirtha Rao, Andhra Pradesh, IN;
Council of Scientific and Industrial Research, New Delhi, IN;
Abstract
The present invention describes an improved process for the preparation of 2-chloro-5-methylpyridine-3-carbaldehyde from N-benzyl-N-(1-Propenyl)acetamide using diphosgene and dimethylformamide or triphosgene and dimethylformamide (Vilsmeyer reagent) in 92% yield against reported 12% yield. The present invention has the advantage of using diphosgene and triphosgene instead of toxic phosgene gas and phosphorousoxytrichloride, thereby avoiding the formation of phosphorous salt.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile