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Croconate blue or 1,2,3-tris(dicyanomethylene)croconate is a divalent anion with chemical formula or ((N≡C-)2C=)3(C5O2)2−. It is one of the pseudo-oxocarbon anions, as it can be described as a derivative of the croconate oxocarbon anion through the replacement of three oxygen atoms by dicyanomethylene groups =C(-C≡N)2. The term Croconate Blue as a dye name specifically refers to the dipotassium salt . ==History and synthesis== The anion was synthesized and characterized by A. Fatiadi in 1978, together with croconate violet. He obtained the corresponding acid, croconate acid blue by treating croconic acid with malononitrile in water solution at 80–90 °C.〔 Alexander J. Fatiadi (1978), ''Synthesis of 1,3-(dicyanomethylene)croconate salts. New bond-delocalized dianion, "Croconate Violet"''. Journal of the American Chemical Society, volume 100 issue 8, pages 2586–2587. 〕〔 Alexander J. Fatiadi (1980), ''Pseudooxocarbons. Synthesis of 1,2,3-tris(dicyanomethylene)croconate salts. A new bond-delocalized dianion, croconate blue''. Journal of Organic Chemistry volume 45, pages 1338-1339. 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Croconate blue」の詳細全文を読む スポンサード リンク
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