33214

Acetic anhydride

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

• Synonym(s): Acetanhydride, Acetic acid anhydride, Acetyl acetate, Acetyl anhydride, Ethanoic anhydride
• Linear Formula: (CH₃CO)₂O
• CAS Number: 108-24-7
• Molecular Weight: 102.09
• Beilstein: 385737
• EC Number: 203-564-8
• MDL number: MFCD00008705
• UNSPSC Code: 12352100
• PubChem Substance ID: 329754473
• NACRES: NA.21

Properties

• grade: ACS reagent; puriss. p.a.
• Agency: USP/NF; reag. ISO; reag. Ph. Eur.
• vapor density: 3.5 (vs air)
• vapor pressure: 10 mmHg ( 36 °C); 4 mmHg ( 20 °C)
• Assay: ≥99% (GC)
• autoignition temp.: 629 °F
• expl. lim.: 10.3 %
• impurities: ≤0.003% non-volatile matter; ≤0.01% KMnO₄ red. matter (as O)
• refractive index: n20/D 1.390 (lit.)
• bp: 138-140 °C (lit.)
• mp: −73 °C (lit.)
• density: 1.08 g/mL (lit.)
• anion traces: chloride (Cl^-): ≤2 mg/kg; phosphate (PO₄^3-): ≤10 mg/kg; sulfate (SO₄^2-): ≤5 mg/kg
• cation traces: 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
• suitability: 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
• InChI key: WFDIJRYMOXRFFG-UHFFFAOYSA-N

Description

General description

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.

Application

• 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).

Other Notes

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.

Safety Information

• Pictograms: GHS02,GHS06,GHS05
• Signal Word: Danger
• Hazard Statements: H226,H302,H314,H330
• Precautionary Statements: P210 - P280 - P301 + P312 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338
• Hazard Classifications: Acute Tox. 2 Inhalation - Acute Tox. 4 Oral - Eye Dam. 1 - Flam. Liq. 3 - Skin Corr. 1B
• Storage Class Code: 3 - Flammable liquids
• WGK: WGK 1
• Flash Point(F): 120.2 °F - closed cup
• Flash Point(C): 49 °C - closed cup