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Acetic anhydride

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(Redirected from Acetic Anhydride) Organic compound with formula (CH₃CO)₂O
Acetic anhydride
Acetic anhydride
Acetic anhydride
Names
Preferred IUPAC name Acetic anhydride
Systematic IUPAC name Ethanoic anhydride
Other names Ethanoyl ethanoate
Acetic acid anhydride
Acetyl acetate
Acetyl oxide
Acetic oxide
Identifiers
CAS Number
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.003.241 Edit this at Wikidata
EC Number
  • 203-564-8
PubChem CID
RTECS number
  • AK1925000
UNII
UN number 1715
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C4H6O3/c1-3(5)7-4(2)6/h1-2H3Key: WFDIJRYMOXRFFG-UHFFFAOYSA-N
  • InChI=1/C4H6O3/c1-3(5)7-4(2)6/h1-2H3Key: WFDIJRYMOXRFFG-UHFFFAOYAH
SMILES
  • O=C(OC(=O)C)C
  • CC(=O)OC(=O)C
Properties
Chemical formula C4H6O3
Molar mass 102.089 g·mol
Appearance colorless liquid
Density 1.082 g cm, liquid
Melting point −73.1 °C (−99.6 °F; 200.1 K)
Boiling point 139.8 °C (283.6 °F; 412.9 K)
Solubility in water 2.6 g/100 mL, reacts (see text)
Vapor pressure 4 mmHg (20 °C)
Magnetic susceptibility (χ) −52.8·10 cm/mol
Refractive index (nD) 1.3901
Thermochemistry
Std enthalpy of
formation (ΔfH298) 		−624.4 kJ/mol
Pharmacology
Legal status
Hazards
GHS labelling:
Pictograms GHS02: FlammableGHS05: CorrosiveGHS07: Exclamation mark
Signal word Danger
Hazard statements H226, H302, H314, H330
Precautionary statements P210, P233, P240, P241, P242, P243, P260, P261, P264, P270, P271, P280, P301+P312, P301+P330+P331, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P310, P312, P321, P330, P363, P370+P378, P403+P235, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuelInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acid
3 2 1W
Flash point 49 °C (120 °F; 322 K)
Autoignition
temperature 		316 °C (601 °F; 589 K)
Explosive limits 2.7–10.3%
Lethal dose or concentration (LD, LC):
LC50 (median concentration) 1000 ppm (rat, 4 h)
NIOSH (US health exposure limits):
PEL (Permissible) TWA 5 ppm (20 mg/m)
REL (Recommended) C 5 ppm (20 mg/m)
IDLH (Immediate danger) 200 ppm
Safety data sheet (SDS) ICSC 0209
Related compounds
Related acid anhydrides Propionic anhydride
Related compounds Acetic acid
Acetyl chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

Acetic anhydride, or ethanoic anhydride, is the chemical compound with the formula (CH3CO)2O. Commonly abbreviated Ac2O, it is the simplest isolable anhydride of a carboxylic acid and is widely used as a reagent in organic synthesis. It is a colorless liquid that smells strongly of acetic acid, which is formed by its reaction with moisture in the air.

Structure and properties

Acetic anhydride in a glass bottle

Acetic anhydride, like most acid anhydrides, is a flexible molecule with a nonplanar structure. The pi system linkage through the central oxygen offers very weak resonance stabilization compared to the dipole-dipole repulsion between the two carbonyl oxygens. The energy barriers to bond rotation between each of the optimal aplanar conformations are quite low.

Like most acid anhydrides, the carbonyl carbon atom of acetic anhydride has electrophilic character, as the leaving group is carboxylate. The internal asymmetry may contribute to acetic anhydride's potent electrophilicity as the asymmetric geometry makes one side of a carbonyl carbon atom more reactive than the other, and in doing so tends to consolidate the electropositivity of a carbonyl carbon atom to one side (see electron density diagram).

Production

Acetic anhydride was first synthesized in 1852 by the French chemist Charles Frédéric Gerhardt (1816-1856) by heating potassium acetate with benzoyl chloride.

Acetic anhydride is produced by carbonylation of methyl acetate:

CH3CO2CH3 + CO → (CH3CO)2O

The Tennessee Eastman acetic anhydride process involves the conversion of methyl acetate to methyl iodide and an acetate salt. Carbonylation of the methyl iodide in turn produces acetyl iodide, which reacts with acetate salts or acetic acid to give the product. Rhodium chloride in the presence of lithium iodide is employed as catalysts. Because acetic anhydride is not stable in water, the conversion is conducted under anhydrous conditions.

To a decreasing extent, acetic anhydride is also prepared by the reaction of ketene (ethenone) with acetic acid at 45–55 °C and low pressure (0.05–0.2 bar).

H2C=C=O + CH3COOH → (CH3CO)2O
(ΔH = −63 kJ/mol)

The route from acetic acid to acetic anhydride via ketene was developed by Wacker Chemie in 1922, when the demand for acetic anhydride increased due to the production of cellulose acetate.

Due to its low cost, acetic anhydride is usually purchased, not prepared, for use in research laboratories.

Reactions

Acetic anhydride is a versatile reagent for acetylations, the introduction of acetyl groups to organic substrates. In these conversions, acetic anhydride is viewed as a source of CH3CO.

Acetylation of alcohols and amines

Alcohols and amines are readily acetylated. For example, the reaction of acetic anhydride with ethanol yields ethyl acetate:

(CH3CO)2O + CH3CH2OH → CH3CO2CH2CH3 + CH3COOH

Often a base such as pyridine is added to function as catalyst. In specialized applications, Lewis acidic scandium salts have also proven effective catalysts.

Acetylation of aromatic rings

Aromatic rings are acetylated by acetic anhydride. Usually acid catalysts are used to accelerate the reaction. Illustrative are the conversions of benzene to acetophenone and ferrocene to acetylferrocene:

(C5H5)2Fe + (CH3CO)2O → (C5H5)Fe(C5H4COCH3) + CH3CO2H

Preparation of other acid anhydrides

Dicarboxylic acids are converted to the anhydrides upon treatment with acetic anhydride. It is also used for the preparation of mixed anhydrides such as that with nitric acid, acetyl nitrate.

Precursor to geminal diacetates

Aldehydes react with acetic anhydride in the presence of an acidic catalyst to give geminal diacetates. A former industrial route to vinyl acetate involved the intermediate ethylidene diacetate, the geminal diacetate obtained from acetaldehyde and acetic anhydride:

CH3CHO + (CH3CO)2O → (CH3CO2)2CHCH3

Hydrolysis

Acetic anhydride dissolves in water to approximately 2.6% by weight. Aqueous solutions have limited stability because, like most acid anhydrides, acetic anhydride hydrolyses to give carboxylic acids. In this case, acetic acid is formed, this reaction product being fully water miscible:

(CH3CO)2O + H2O → 2 CH3COOH

Cinnamic acid synthesis

In the last third of the 19th century the main application for the acetic anhydride was the Perkin reaction.

Applications

As indicated by its organic chemistry, acetic anhydride is mainly used for acetylations leading to commercially significant materials. Its largest application is for the conversion of cellulose to cellulose acetate, which is a component of photographic film and other coated materials, and is used in the manufacture of cigarette filters. Similarly it is used in the production of aspirin (acetylsalicylic acid), which is prepared by the acetylation of salicylic acid. It is also used as an active modification agent via autoclave impregnation and subsequent acetylation to make a durable and long-lasting timber.

In starch industry, acetic anhydride is a common acetylation compound, used for the production of modified starches (E1414, E1420, E1422)

Legal status

Because of its use for the synthesis of heroin by the diacetylation of morphine, acetic anhydride is listed as a U.S. DEA List II precursor, and restricted in many other countries.

Safety

Acetic anhydride is an irritant and combustible liquid; it is highly corrosive to skin and any direct contact will result in severe burns. Because of its reactivity toward water and alcohol, foam or carbon dioxide are preferred for fire suppression. The vapour of acetic anhydride is harmful.

References

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