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. 22, 1998
Filed:
Jul. 30, 1996
Applicant:
Inventors:
Orin Tempkin, Edison, NJ (US);
Prasad Kapa, Parsippany, NJ (US);
Assignee:
Johnson Matthey PLC, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
540470 ; 540450 ;
Abstract
An improved process for preparing 1,4,8,11-tetraazacyclotetradecane comprising the bisacylation of an acyclic diamine to obtain a dichlorodiamide compound in a first step, the cyclization of said diamide compound to obtain dioxocyclam in a second step, and the reduction of dioxocyclam in a third step to obtain the desired 1,4,8,11-tetraazacyclotetradecane.