Procedure for the preparation of derivatives of the acids 3,5-diaminopirazin-2,6-dicarboxºlicos (Machine-translation by Google Translate, not legally binding)

摘要

Process for the preparation of 3,5-diaminopyrazine-2,6-bicarboxylic acid derivatives, intended to improve the appearance in the light of the day of more or less colorless supports, based on the optical compensation of yellowing by means of violated fluorescence, blue to blue-green, characterized by condensing a 1,3-bisubstituted 4-amino uracil with a 1,3-bisubstituted 4-amino-5-nitroso uracil to form the corresponding 3.2; 5,6-bis - [(2 ', 4'-dioxy-1', 2 ', 3', 4 ', - tetrahydro) -1', 4'-pyramidino] -pyrazine and saponify this directly or gradually by the known methods for forming 3,5-diaminopyrazine-2,6-bicarboxylic acid derivatives, in certain cases with transformation of the free carboxyl groups by means of esterification and/or amidation. (Machine-translation by Google Translate, not legally binding)