5,5 '-BIPYRIDYL-2,4,6,2 ',4 ',6 '-HEXAONE DERIVATIVES (HYDURILIC ACIDS): SYNTHESES, MECHANISM OF C-C-BOND FORMATION AND PROPERTIES OF THE DIMERIC BARBITURIC ACID DERIVATIVES

[摘要]：A series of hydurilic acid derivatives (5,5'-bipyrimidinyl-2,4,6,2',4',6'-hexaones) including several new derivatives was synthesized from 5,6-diaminouracils. Mechanisms for their formation are proposed and discussed. Furthermore, a new method for the preparation of pyrimidine-2,4,5,6-tetraone-5-oxime derivatives (violuric acids) was found starting from 5-amino-6-nitrosouracils.

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