Pharmaceutical, Agrochemical, and Dye Intermediate PCT/OCT and Its Downstream Products

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.
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Molar mass: 116.07 g/mol

Appearance: White, solid

Density: 1.635 g/cm³, solid

Melting point: 287 °C

Solubility in water: 0.63 g/100 mL

Acidity (pKa): pka1 = 3.03, pka2 = 4.44

food additive, also used in the manufacture of polyester resins and polyhydric alcohols and as a mordant for dyes.