It has been shown that the trimer of malononitrile of m.p. 218°, first described by Schenck and Finken in 1928, and assigned the structure 2,4-diaminopenta-1,3-diene-1,1,3,5-tetracarbonitrile by Junek and Sterk in 1967, is, in fact, ammonium 1,1,3,3-tetracyano-2-cyanomethylpropenide.
J. D. Atkinson and M. C. Johnson, J. Chem. Soc. C, 1969, 2181 DOI: 10.1039/J39690002181
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