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Synthesis and characterization of new bond-delocalized dianions, e.g., 2, 1,3-bis-, 1, 2, 3-tris (dicyanomethylene) croconate salts have been described. The dianions reported represent a new class of aromatic, nonbenzenoid compounds, named pseudo-oxocarbons. A study of their physical, analytical and chemical properties offer a new direction in the chemistry of oxocarbons.

journal of research of the national bureau of standards

Pseudo-oxocarbons. Synthesis of 2,1,3-bis-, and 1,2,3-tris (dicyanomethylene) croconate salts. New bond-delocalized dianions, croconate violet and croconate blue