Basicity of 3-formyl-4,7-diaminocoumarins and their azomethine derivatives

The basicity of a series of 3-formyl-4,7-diaminocoumarins and their azomethine derivatives was studied. By using PMR data, it was determined that primary protonation of most aldehydes affects the nitrogen atom in the 7 position and, in the case of azomethines, the nitrogen atom of the azomethine group.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 349–352, March, 1993.