Fumaric acid

Fumaric acid is an organic compound with the molecular formula C4H4O4.

Formula
C4H4O4
Functional group
Carboxylic acids; Dicarboxylic acids
Molar mass
116.07 g/mol
Also known as
(E)-but-2-enedioic acid, trans-Butenedioic acid, Allomaleic acid, Lichenic acid, Boletic acid, (2E)-but-2-enedioic acid, Tumaric acid

Overview

Fumaric acid is an organic compound with the molecular formula C4H4O4.

Identifiers

Formula
C4H4O4
Functional group
Carboxylic acids; Dicarboxylic acids
Molar mass
116.07 g/mol
Also known as
(E)-but-2-enedioic acid, trans-Butenedioic acid, Allomaleic acid, Lichenic acid, Boletic acid, (2E)-but-2-enedioic acid, Tumaric acid
Chemical identifiers
SMILES
C(=C/C(=O)O)\C(=O)O
InChI
InChI=1S/C4H4O4/c5-3(6)1-2-4(7)8/h1-2H,(H,5,6)(H,7,8)/b2-1+
PubChem CID
444972

Properties

Melting / decomposition
287 °C decomposes
Sublimation
Sublimes at 200 °C
Density
1.635 g/cu cm at 20 °C
Water solubility
In water, 7X10-3 mg/L at 25 °C

Related compounds

  • Carboxylic acids

    Fumaric acid is an organic compound with the molecular formula C4H4O4.

  • Dicarboxylic acids

    Fumaric acid is an organic compound with the molecular formula C4H4O4.

References

  1. PubChem Compound Summary: Fumaric acid (CID 444972)National Center for Biotechnology Information · PubChem

    Identity, molecular formula, molecular weight and aliases retrieved via PUG REST on 2026-09-08.

  2. Hazardous Substances Data Bank (HSDB): Fumaric acid — melting pointHazardous Substances Data Bank (HSDB)

    Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/444972#section=Melting-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V2: 1964

  3. Hazardous Substances Data Bank (HSDB): Fumaric acid — boiling pointHazardous Substances Data Bank (HSDB)

    Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/444972#section=Boiling-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Dean, J.A. (ed.). Lange's Handbook of Chemistry. 13 ed. New York, NY: McGraw-Hill Book Co., 1985., p. 7-419

  4. Hazardous Substances Data Bank (HSDB): Fumaric acid — densityHazardous Substances Data Bank (HSDB)

    Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/444972#section=Density. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Lide, D.R. CRC Handbook of Chemistry and Physics 88TH Edition 2007-2008. CRC Press, Taylor & Francis, Boca Raton, FL 2007, p. 3-264

  5. Hazardous Substances Data Bank (HSDB): Fumaric acid — solubilityHazardous Substances Data Bank (HSDB)

    Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/444972#section=Solubility. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Yalkowsky, S.H., He, Yan., Handbook of Aqueous Solubility Data: An Extensive Compilation of Aqueous Solubility Data for Organic Compounds Extracted from the AQUASOL dATAbASE. CRC Press LLC, Boca Raton, FL. 2003., p. 86