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Maleic acid

Maleic acid or cis-butenedioic acid is an organic compound that is a dicarboxylic acid, a molecule with two carboxyl groups. Its chemical formula is HO2CCH=CHCO2H. Maleic acid is the cis-isomer of butenedioic acid, whereas fumaric acid is the trans-isomer. It is mainly used as a precursor to fumaric acid, and relative to its parent maleic anhydride, maleic acid has few applications.

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Further Information

Names

Preferred IUPAC name: (2)-But-2-enedioic acid

Other names

()-butenedioic acid, -butenedioic acid, malenic acid, maleinic acid, toxilic acid

Identifiers

CAS Number: 110-16-7

JSmol: Interactive image

ChEBI: CHEBI:18300

ChEMBL: ChEMBL539648

ChemSpider: 392248

ECHA InfoCard: 100.003.403

EC Number: 203-742-5

KEGG: C01384

RTECS number: OM9625000

UNII: 91XW058U2C

Properties

Chemical formula: C4H4O4

Molar mass: 116.07 g·mol

Appearance: White solid

Density: 1.59 g/cm³

Melting point: 135 °C (275 °F; 408 K) (decomposes)

Solubility in water: 478.8 g/L at 20 C

K: k

Magnetic susceptibility: -49.71·10 cm/mol−63

Hazards

Safety data sheet: MSDS from J. T. Baker

EU classification: Xn

R-phrases: R22 R36/37/38

S-phrases: (S2) S26 S28 S37

NFPA 704:

Related compounds

carboxylic acids: fumaric acid

Related compounds: maleic anhydride

Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).

Infobox references