Fumaric Acid

Fumaric acid or trans-butenedioic acid is the chemical compound with the formula HO2CCH=CHCO2H. This white crystalline compound is one of two isomeric unsaturated dicarboxylic acids, the other being maleic acid. In fumaric acid the carboxylic acid groups are trans (E) and in maleic acid they are cis (Z). Fumaric acid has a fruit-like taste. The salts and esters are known as fumarates. Dimethyl fumarate significantly reduces disability progression in multiple sclerosis.

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Maleic Acid - Physical Properties
... Maleic acid is a less stable molecule than fumaric acid ... Maleic acid is more soluble in water than fumaric acid ... The melting point of maleic acid (135 °C) is also much lower than that of fumaric acid (287 °C) ...
Maleic Acid - Production and Industrial Applications - Isomerization To Fumaric Acid
... The major industrial use of maleic acid is its conversion to fumaric acid ... This conversion, an isomerization, is catalysed by a variety of reagents, such as mineral acids and thiourea ... Again, the large difference in water solubility makes fumaric acid purification easy ...