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The interaction of cyanogen chloride and 2-hydrazinopyrimidines under mild conditions yields 3-amino-s-triazolo-[4,3-a]pyrimidines, which are isomerised under suitable conditions to the corresponding 2-amino-s-triazolo-[2,3-a]pyrimidines. The mechanisms involved have in part been elucidated starting from 2-hydrazino-pyrimidines with alkoxyl groups in position 4 and/or 6.
J. A. Bee and F. L. Rose, J. Chem. Soc. C, 1966, 2031 DOI: 10.1039/J39660002031
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