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A sort of process of production of 1,4-diketo-3,6-diphenylpyrrole-(3,4-C)-pyrrole by heating 1,4-diketo-3,6-diphenylphrrolo-(3,4-C)-pyrrole to elevated temperature, preferably by recrystallaization from an aromatic solvent or mixture of aromatic solvents, to a temperature higher than 220oC.
TW082109566A1992-12-231993-11-16Process for preparing 1,4-diketo-3,6-diphenylpyprolo-(3,4-C)-pyprole
TW339336B
(en)
Novel 3-(2-(azabicyclo) ethyl)1,2,3,4-tetrahydro-5H(1)benzopyrano(3,4-c)pyridin-5-ones, pharmaceutical compositions containing them and processes for their production.