242845

Essigsäureanhydrid

ACS reagent, ≥98.0%

• Synonym(e): Acetanhydride, Acetic acid anhydride, Acetyl acetate, Acetyl anhydride, Ethanoic anhydride
• Lineare Formel: (CH₃CO)₂O
• CAS-Nummer: 108-24-7
• Molekulargewicht: 102.09
• Beilstein: 385737
• EG-Nummer: 203-564-8
• MDL-Nummer: MFCD00008705
• UNSPSC-Code: 12352100
• PubChem Substanz-ID: 24854587
• NACRES: NA.21

Eigenschaften

• Qualität: ACS reagent
• Qualitätsniveau: 200
• 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 (PO₄^3-): ≤0.001%; sulfate (SO₄^2-): ≤5 ppm
• Kationenspuren: Fe: ≤5 ppm; heavy metals: ≤2 ppm
• Funktionelle Gruppe: anhydride; ester
• SMILES String: CC(=O)OC(C)=O
• InChI: 1S/C4H6O3/c1-3(5)7-4(2)6/h1-2H3
• InChIKey: WFDIJRYMOXRFFG-UHFFFAOYSA-N

Beschreibung

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.

Sicherheitshinweise

• Piktogramme: GHS02,GHS06,GHS05
• Signalwort: Danger
• H-Sätze: H226,H302,H314,H330
• P-Sätze: P210 - P280 - P301 + P312 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338
• 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