Concept

Deltic acid

Summary
Deltic acid (also known as dihydroxycyclopropenone or trianglic acid) is a chemical substance with the chemical formula C3O(OH)2. It can be viewed as a ketone and double enol of cyclopropene. At room temperature, it is a stable white solid, soluble in diethyl ether, that decomposes (sometimes explosively) between 140 °C and 180 °C, and reacts slowly with water. Derivatives Deltate and salts Deltic acid is considered an acid because it is a particularly acidic enediol, with hydroxyl groups relatively easily losing their protons (pKa1 = 2.57, pKa2 = 6.03), leaving behind the symmetric deltate anion, . The first deltate salts (of lithium and potassium) were described in 1976, also by Eggerding and West. Lithium deltate Li2C3O3 is a water-soluble white solid. Like the other cyclic dianions with formula (CO)n2−, the deltate anion has a pronounced aromatic character which contributes to its relative stability.
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