High Quality Content by WIKIPEDIA articles! 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 dicyanomethylene group =C(-C?N)2. The anion was syntesized and characterized by A. Fatiadi in 1980, by hydrolysis of croconate violet treated with potassium hydroxide. It gives an orange solution in water.

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