# 2-(Dicyanomethylene)croconate

2-(Dicyanomethylene)croconate is a divalent anion with chemical formula C8N2O2−4 or ((N≡C−)2C=)(C5O4)2−. It is one of the pseudo-oxocarbon anions, as it can be described as a derivative of the croconate oxocarbon anion C5O2−5 through the replacement of one oxygen atom by a group =C(−C≡N)2. The anion was synthesized and characterized by A. Fatiadi in 1980, by hydrolysis of croconate violet treated with potassium hydroxide. It gives an orange solution in water. (Wikipedia).

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1,3-Bis(dicyanomethylene)squarate | Oxocarbon anion | Pseudo-oxocarbon anion | 1,2-Bis(dicyanomethylene)squarate