Abstract

The alkylation of 5-methyl-s-triazolo [1, 5-a] pyrimidin-7-ol (I) with alkyl iodide and dialkyl sulfate always afforded the two N-alkylated products (IIa-b and IIIa-b). The structure of these products was established to be 4-alkayl-5-methyl-s-triazolo [1, 5-a]-pyrimidin-7 (4H)-ones and 3-alkyl-5-methyl-s-triazolo [1, 5-a] pyrimidin-7 (3H)-ones respectively.

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