921447-19-0Relevant articles and documents
3-aminopyrrole-2,5-diones 3. Synthesis of benzenehexa-carboxylic acid trimethylimide and 1,1-dimethyl-4-methylamino-[3,3]bipyrrolyl-2,5,2,5-tetraone by the reaction of 1-methyl-3-methylaminopyrrole-2,5-dione with hydrogen chloride
Chepyshev,Chepysheva, Yu. N.,Ryabitsky,Prosyanik
, p. 823 - 826 (2009)
In the presence of hydrogen chloride in aqueous methanol 1-methyl-3-methylaminopyrrole-2,5-dione forms benzenehexacarboxylic acid trimethylimide but gives 1,1-dimethyl-4-methylamino[3,3]bi-pyrrolyl-2,5,2, 5tetraone when absolute methanol is used.