5-Imino-2-pyrazolin-4-carbonitriles

Imino-2-pyrazolin-4-carbonitriles and 4-carboxamides have been prepared by Taylor by reaction of hydrazines with malononitrile.1478... 

This presumably goes by dimerization of the malononitrile to give a substituted /3-amino-crotononitrile. This dimer also reacts with hydrazines to give 5-imino-2-pyrazolin-4-carbonitriles. These can be hydrolyzed to amides. 

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See also in sourсe #XX -- [ ]

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