33214

Essigsäureanhydrid

puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99% (GC)

• 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: 329754473
• NACRES: NA.21

Eigenschaften

• Qualität: ACS reagent; puriss. p.a.
• Agentur: USP/NF; reag. ISO; reag. Ph. Eur.
• Dampfdichte: 3.5 (vs air)
• Dampfdruck: 10 mmHg ( 36 °C); 4 mmHg ( 20 °C)
• Assay: ≥99% (GC)
• Selbstzündungstemp.: 629 °F
• Expl.-Gr.: 10.3 %
• Verunreinigungen: ≤0.003% non-volatile matter; ≤0.01% KMnO₄ red. matter (as O)
• Brechungsindex: n20/D 1.390 (lit.)
• bp: 138-140 °C (lit.)
• mp (Schmelzpunkt): −73 °C (lit.)
• Dichte: 1.08 g/mL (lit.)
• Anionenspuren: chloride (Cl^-): ≤2 mg/kg; phosphate (PO₄^3-): ≤10 mg/kg; sulfate (SO₄^2-): ≤5 mg/kg
• Kationenspuren: Al: ≤0.5 mg/kg; B: ≤0.02 mg/kg; Ba: ≤0.1 mg/kg; Ca: ≤0.5 mg/kg; Cd: ≤0.05 mg/kg; Co: ≤0.02 mg/kg; Cr: ≤0.05 mg/kg; Cu: ≤0.02 mg/kg; Fe: ≤0.1 mg/kg; Mg: ≤0.1 mg/kg; Mn: ≤0.02 mg/kg; Ni: ≤0.02 mg/kg; Pb: ≤0.1 mg/kg; Sn: ≤0.1 mg/kg; Zn: ≤0.2 mg/kg
• Eignung: passes test for reaction against H₂SO₄
• 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 a colorless liquid. On dissolution in water, it undergoes solvolysis to afford acetic acid. It is widely employed as acetylation reagent 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. It is employed as solvent for various organic reactions.[1]

Anwendung

• Modification of Quinoa Starches: Acetic anhydride is used to modify the structure of starch molecules, discussing its implications on improving bread quality and food processing (Wang et al., 2024).

Sonstige Hinweise

The article number 33214-4X2.5L will be discontinued. Please order the single bottle 33214-2.5L which is physically identical with the same exact specifications.
The article number 33214-4X2.5L-M will be discontinued. Please order the single bottle 33214-2.5L-M which is physically identical with the same exact specifications.
The article number 33214-6X1L will be discontinued. Please order the single bottle 33214-1L which is physically identical with the same exact specifications.
The article number 33214-6X1L-M will be discontinued. Please order the single bottle 33214-1L-M which is physically identical with the same exact specifications.

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