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:
May. 30, 2006
Filed:
Sep. 08, 2004
Arvind Singh Negi, Lucknow, IN;
Sunil Kumar Chattopadhyay, Lucknow, IN;
Sachin Srivastava, Lucknow, IN;
Asish Kumar Bhattacharya, Lucknow, IN;
Arvind Singh Negi, Lucknow, IN;
Sunil Kumar Chattopadhyay, Lucknow, IN;
Sachin Srivastava, Lucknow, IN;
Asish Kumar Bhattacharya, Lucknow, IN;
Council of Scientific & Industrial Research, New Delhi, IN;
Abstract
Demethylation of 3', 4′-dimethoxy or 3′, 4′, 5′-trimethoxy benzoic ester of a phenol is carried out in the presence of an excess of aluminum halide in an organic solvent to get 4′-Hydroxy, 3′-methoxy or 4′ hydroxy, 3′, 5′-dimethoxy benzoic acid ester of a phenol. The reaction is also applicable to 3′, 4′, 5′-trimethoxy diaryl ketone and some natural products like reserpine.