Description
Acetic Anhydride ACS Reagent ≥98.0% 3 Kg
- CAS Number 108-24-7
- Linear Formula (CH3CO)2O
- Molecular Weight 102.09
- Beilstein/REAXYS Number 385737
- EC Number 203-564-8
- MDL number MFCD00008705
- PubChem Substance ID 24854587
- NACRES NA.21
| grade | ACS reagent |
| Vapor Density | 3.5 (vs air) |
| Vapor Pressure | 10 mmHg (36°C) 4 mmHg (20°C) |
| InChI Key | WFDIJRYMOXRFFG-UHFFFAOYSA-N |
| Assay | ≥98.0% |
| Autoignition Temperature | 629°F |
| Expl. Lim. | 10.3 % |
| Impurities | MnO4- reducers, passes test |
| evapn. residue | ≤0.003% |
| Refractive Index | n20/D 1.390 (lit.) |
| bp | 138-140°C (lit.) |
| mp | −73°C (lit.) |
| solubility | H2O: slightly soluble |
| Density | 1.08 g/mL (lit.) |
| anion traces | chloride (Cl-): ≤5 ppm phosphate (PO43-): ≤0.001% sulfate (SO42-): ≤5 ppm |
| cation traces | Fe: ≤5 ppm heavy metals: ≤2 ppm |
General description
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.
Application
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
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