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. 05, 1990
Filed:
Apr. 20, 1989
Applicant:
Inventors:
Assignee:
Nissan Chemical Industries, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548363 ; 546279 ; 548364 ; 548367 ;
Abstract
A process for production of 2-pyrazolin-5-ones having the formula (I): ##STR1## which comprises cyclizing hydrazone derivatives having the formula (II): ##STR2## in the presence of a base; wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represents a specific group; compounds having the formula (I) as well as compounds having the formula (II) and a process for production thereof.