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. 03, 2002
Filed:
Mar. 09, 2001
Fabio Broussard, Brusaporto, IT;
Carlo Neri, San Donato Milanese, IT;
Flavio Somenzi, Cinisello Balsamo, IT;
Abstract
Process for the preparation of symmetrical diacylhydrazines having general formula (I): R —CO—NH—NH—CO—R wherein R represents a linear or branched C -C alkyl group; a linear or branched C -C alkoxyalkyl group; a C -C cyanoalkyl group; a C -C cycloalkyl group, said cycloalkyl group optionally containing a heteroatom selected from oxygen, nitrogen and sulfur; a C -C aryl group; a C C arylalkyl group or alkylaryl group, said arylalkyl or alkylaryl groups optionally substituted with one or more hydroxyl groups, or with one or more linear or branched C alkoxyl groups; comprising: (a) reacting an ester of a carboxylic acid having general formula (II): R —CO—OR wherein R has the same meanings defined above and R represents a linear or branched C -C alkyl group, with hydrazine, in its pure or hydrated state, obtaining a monoacylhydrazine having general formula (III): R —CO—NH—NH ; (b) reacting the monoacylhydrazine having general formula (III) obtained in step (a), with a &bgr;-ketoester having general formula (IV): R —CO—CH —COOR wherein R represents a linear or branched C -C alkyl group, or a C -C aryl group and R represents a linear or branched C -C alkyl group, obtaining the desired symmetrical diacylhydrazine having general formula (I).