Synthesis 2008(8): 1179-1181  
DOI: 10.1055/s-2008-1042939
SHORTPAPER
© Georg Thieme Verlag Stuttgart · New York

A Reliable Route to 1,2-Diamino-4,5-phthalodinitrile

Christian Burmester, Rüdiger Faust*
Institute for Chemistry and CINSaT - Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
Fax: +49(561)8044752; e-Mail: r.faust@uni-kassel.de;
Further Information

Publication History

Received 19 October 2007
Publication Date:
18 March 2008 (online)

Abstract

Starting from o-phenylenediamine, we have developed a new and reliable route to 1,2-diamino-4,5-phthalodinitrile that is based on the reductive desulfurisation of 5,6-dicyano-2,1,3-benzothiadiazole with sodium borohydride. The reaction sequence uses only cheap reagents and relies on simple recrystallisations for the purification of all intermediates.