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Sigma-Aldrich® Maleic acid ReagentPlus®, ≥99% (HPLC)

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MT-CM-M0375-100G

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Linear Formula:  HO2CCH=CHCO2H

CAS Number:  110-16-7

Molecular Weight:  116.07

Beilstein:  605762

EC Number:  203-742-5

MDL number:  MFCD00063177

UNSPSC Code:  12352100

PubChem Substance ID:  24896549

NACRES:  NA.21

Grade  reagent grade

Quality Level  200

vapor density  4.0 (at °C, vs air)

vapor pressure  ≤0.1 at hPa ( 20 °C)

product line   ReagentPlus®

Assay  ≥99% (HPLC)

Form   powder

Concentration  ≤100%

Impurities  ≤2.0% water

ign. Residue  ≤0.1%

pH  1,3 -at 100 g/l (at 20 °C)

pKa (25 °C)  (1) 1.97, (2) 6.24

bp  157.8 °C/316.0 °F -at 997 hPa

mp  130-135 °C (lit.)

solubility  water: soluble 478,8  g/L at at 20 °C (Completely )

density  1.59 g/mL at 25 °C (lit.)

functional group  carboxylic acid

SMILES string  OC(=O)\C=C/C(O)=O

InChI  1S/C4H4O4/c5-3(6)1-2-4(7)8/h1-2H,(H,5,6)(H,7,8)/b2-1-

InChI key  VZCYOOQTPOCHFL-UPHRSURJSA-N

General description

Maleic acid (MA) is a dicarboxylic acid that undergoes esterification with ethanol in the presence of cation-exchange resin catalysts to form diethyl maleate.[1] Its crystalline structure has been analyzed.[2] Reaction kinetics and mechanism of the isomerization of maleic acid to fumaric acid in the presence of ceric and bromide ions has been investigated.[3] The reaction mechanism and reactivity ratios for the radical copolymerization of maleic acid with styrene have been determined.[4]

Application

Maleic acid has been used in the preparation of tris-maleate buffer[5] and sodium maleate buffer.[6][7] It has also been used for the pretreatment of poplar tracheid cell walls for the spectroscopic analysis of lignin.[8] It may be used to synthesize superswelling acrylamide/maleic acid hydrogels.[9]

Analysis Note

Repurified

Legal Information

ReagentPlus is a registered trademark of Merck KGaA, Darmstadt, Germany