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Maleic Acid 99% ReagentPlus
  • 100g Maleic Acid 99% ReagentPlus

  • $ 47.45000000
  • 500g Maleic Acid 99% ReagentPlus

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  • 1kg Maleic Acid 99% ReagentPlus

  • $ 98.55000000
  • 25kg Maleic Acid 99% ReagentPlus

  • $ 1206.00000000
 

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Maleic Acid is an organic salt or ester of maleic acid that could be conjugated to free base compounds/drugs to improve the physiochemical properties including stability, solubility and dissolution rate. Maleic acid is a colorless crystalline solid having a faint odor. It is combustible though it may take some effort to ignite. It is soluble in water. It is used to make other chemicals and for dyeing and finishing naturally occurring fibers.  Maleic acid is an industrial raw material for the production of glyoxylic acid by ozonolysis. Maleic acid is an organic compound which is a dicarboxylic acid (molecule with two carboxyl groups). The molecule consists of an ethylene group flanked by two carboxylic acid groups. Maleic acid is the cis isomer of butenedioic acid, whereas fumaric acid is the trans isomer. The cis isomer is the less stable one of the two; the difference in heat of combustion is 22. 7 kJ/mol. The physical properties of maleic acid are very different from that of fumaric acid. Maleic acid is soluble in water whereas fumaric acid is not and the melting point of maleic acid (130 - 131 degree centigrade) is also much lower than that of fumaric acid (287 degree centigrade). Both properties of maleic acid can be explained on account of the intramolecular hydrogen bonding that takes place at the expense of intermolecular interactions. Maleic acid is converted into maleic anhydride by dehydration, to malic acid by hydration, and to succinic acid by hydrogenation. It reacts with thionyl chloride or phosphorus pentachloride to give the maleic acid chloride (it is not possible to isolate the mono acid chloride). Maleic acid is a reactant in many Diels-Alder reactions.

 

Formula
C4H4O4
Molar mass
116.072 g/mol
CAS Number
110-16-7
Density
1.59 g/cm3 at 25°C (77°F) - lit.
Purity/Grade
≥99% (HPLC)
Appearence
White powder
Melting point/freezing point
137 - 140°C (279 - 284°F) - lit.
Initial boiling point and boiling range
157.8°C (316.0°F) at 997 hPa (748 mmHg) - OECD Test Guideline 103
Flash point
Not applicable
Vapour pressure
<0.1 hPa (<0.1 mmHg) at 20°C (68°F) - OECD Test Guideline 104
Vapour density
4.0 at 20°C (68°F)
Water solubility
478.8 g/l at 20°C (68°F) - OECD Test Guideline 105
pH
1.3 at 100 g/l at 20°C (68°F)
Partition coefficient: n-octanol/water
log Pow: - 1.3 at 20°C (68°F) - OECD Test Guideline 107 - Bioaccumulation is not expected.
Decomposition t emperature
>135°C (>275°F)
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