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58360

Sigma-Aldrich

Isobutyric acid

puriss. p.a., ≥99.5%

Synonym(s):

2-Methylpropionic acid

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About This Item

Linear Formula:
(CH3)2CHCO2H
CAS Number:
79-31-2
Molecular Weight:
88.11
Beilstein/REAXYS Number:
635770
EC Number:
201-195-7
MDL number:
MFCD00002658
UNSPSC Code:
12352100
PubChem Substance ID:
329758414
NACRES:
NA.22
assay:
≥99.5% (GC)
≥99.5%

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vapor density

3.04 (vs air)

Quality Level

200

vapor pressure

1.5 mmHg ( 20 °C)

grade

puriss. p.a.

assay

≥99.5% (GC)
≥99.5%

autoignition temp.

824 °F

expl. lim.

10 %

impurities

≤0.2% water

refractive index

n20/D 1.393 (lit.)
n20/D 1.393

bp

153-154 °C (lit.)

mp

−47 °C (lit.)

density

0.95 g/mL at 25 °C (lit.)

cation traces

Al: ≤0.5 mg/kg
Ba: ≤0.1 mg/kg
Bi: ≤0.1 mg/kg
Ca: ≤0.5 mg/kg
Cd: ≤0.05 mg/kg
Co: ≤0.02 mg/kg
Cr: ≤0.02 mg/kg
Cu: ≤0.02 mg/kg
Fe: ≤0.1 mg/kg
K: ≤0.5 mg/kg
Li: ≤0.1 mg/kg
Mg: ≤0.1 mg/kg
Mn: ≤0.02 mg/kg
Mo: ≤0.1 mg/kg
Na: ≤2 mg/kg
Ni: ≤0.02 mg/kg
Pb: ≤0.1 mg/kg
Sr: ≤0.1 mg/kg
Zn: ≤0.1 mg/kg

functional group

carboxylic acid

SMILES string

CC(C)C(O)=O

InChI

1S/C4H8O2/c1-3(2)4(5)6/h3H,1-2H3,(H,5,6)

InChI key

KQNPFQTWMSNSAP-UHFFFAOYSA-N

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General description

Isobutyric acid can be prepared via the carbonylation of propylene.[1]

Application

Isobutyric acid may be used to synthesize methacrylic acid via oxidative dehydrogenation in the presence of a suitable heteropolyacid as catalyst.[1]

signalword

Danger

Hazard Classifications

Acute Tox. 3 Dermal - Acute Tox. 4 Oral - Eye Dam. 1 - Flam. Liq. 3 - Skin Corr. 1B

Storage Class

3 - Flammable liquids

wgk_germany

WGK 1

flash_point_f

131.0 °F - closed cup

flash_point_c

55 °C - closed cup

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Lot/Batch Number
STBF8413V

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