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. 12, 1989
Filed:
Feb. 05, 1988
Carlo Venturello, Novara, IT;
Rino D'Aloisio, Novara, IT;
Montedison S.p.A., Milan, IT;
Abstract
A process for the preparation of 2-carboxpyrazine 4-oxides having the formula (I) ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3, which may be the same or different, represent a hydrogen atom or an alkyl group having from 1 to 6 carbon atoms, by oxidation of the corresponding 2-carboxypyrazines. The 2-carboxypyrazines are reacted under stirring with an aqueous solution of H.sub.2 O.sub.2, at a pH ranging between 0.5 and 5, in the presence of a catalyst selected from the group consisting of tungstic acid, a isopolytungstic acid, a heteropolytungstic acid, molybdic acid, an isopolymolybidic acid, a heteropolymolybdic acid, and an alkali metal salt thereof.