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".

Abstract

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.