N,N′-Diaminohydantoins are obtained in good yield through the reaction of hydrazidopyridinium salts in a basic medium. The hydrolysis of these hydantoins leads to α-hydrazine acids.
C. Florac, P. Le Grel, M. Baudy-Floc'h and A. Robert, J. Chem. Soc., Perkin Trans. 1, 1989, 2135 DOI: 10.1039/P19890002135
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