Suitable conditions have been determined for the catalytic dechlorination of chloropyrimidines. 5-Aminopyrimidine (I) has been synthesised from uracil, via 5-amino-2 : 4-dichloropyrimidine (I1 ; R = NH,), in 44% over-all yield. The chemical and some physical properties of the former have been examined and a number of derivatives prepared. 5-Aminopyrimidine did not give a diazonium salt, but its dichloro-derivative was converted by nitrous acid into diazouracil (VII) ; the mechanism of this reaction is discussed.

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