Patent ID: 8115007
Filing Date: 2012-02-14
Classification: C07C,C07D,C08G

Abstract:
1. In a process for the preparation of 1) diaminodinitropyridine or 2) diaminodinitrobenzene by contacting 1) an aminopyridine or 2) an aminobenzene, respectively, with oleum and nitric acid, wherein the improvement comprises adding, with stirring, at least about 1% molar excess of nitric acid based upon the aminopyridine or aminobenzene respectively, and stirring is continued for about two to about four hours to form first 1) aminonitropyridine sulfonic acid or 2) aminonitrobenzene sulfonic acid, respectively, and then 1) diaminodinitropyridine or 2) diaminodinitrobenzene respectively.