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Merck

242845

Sigma-Aldrich

Essigsäureanhydrid

ACS reagent, ≥98.0%

Synonym(e):

Acetanhydride, Acetic acid anhydride, Acetyl acetate, Acetyl anhydride, Ethanoic anhydride

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About This Item

Lineare Formel:
(CH3CO)2O
CAS-Nummer:
Molekulargewicht:
102.09
Beilstein:
385737
EG-Nummer:
MDL-Nummer:
UNSPSC-Code:
12352100
PubChem Substanz-ID:
NACRES:
NA.21

Qualität

ACS reagent

Qualitätsniveau

Dampfdichte

3.5 (vs air)

Dampfdruck

10 mmHg ( 36 °C)
4 mmHg ( 20 °C)

Assay

≥98.0%

Form

liquid

Selbstzündungstemp.

629 °F

Expl.-Gr.

10.3 %

Verunreinigungen

MnO4- reducers, passes test

Abdampfrückstand

≤0.003%

Brechungsindex

n20/D 1.390 (lit.)

bp

138-140 °C (lit.)

mp (Schmelzpunkt)

−73 °C (lit.)

Löslichkeit

H2O: slightly soluble

Dichte

1.08 g/mL (lit.)

Anionenspuren

chloride (Cl-): ≤5 ppm
phosphate (PO43-): ≤0.001%
sulfate (SO42-): ≤5 ppm

Kationenspuren

Fe: ≤5 ppm
heavy metals: ≤2 ppm

SMILES String

CC(=O)OC(C)=O

InChI

1S/C4H6O3/c1-3(5)7-4(2)6/h1-2H3

InChIKey

WFDIJRYMOXRFFG-UHFFFAOYSA-N

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Allgemeine Beschreibung

Acetic anhydride is an organic solvent. On dissolution in water it undergoes solvolysis to afford acetic acid. It is widely employed for the acetylation of various alcohols. Wacher process (starting reagent + a ketene) and Knapsack process (starting reagent = acetaldehyde) have been reported for the industrial preparation of acetic anhydride.

Anwendung

Acetic anhydride has been used as one of the reaction components in the preparation of:
  • 2-acetylamino-5-aminobenzenesulfonic acid
  • 3,3′-bis(sulfonato)-4,4′-bis(chloroacetamido)azobenzene (BSBCA)
  • 10-acetoxy-9-nitro-octadecanoic acid, allyl ester
  • 9-nitro-oleic acid
It may be used for acetylation of anisole over HBEA zeolite in a batch reactor.

Signalwort

Danger

Gefahreneinstufungen

Acute Tox. 2 Inhalation - Acute Tox. 4 Oral - Eye Dam. 1 - Flam. Liq. 3 - Skin Corr. 1B

Lagerklassenschlüssel

3 - Flammable liquids

WGK

WGK 1

Flammpunkt (°F)

120.2 °F - closed cup

Flammpunkt (°C)

49 °C - closed cup

Persönliche Schutzausrüstung

Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter


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Rohan D, et al.
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Nature protocols, 2(2), 251-258 (2007-04-05)
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