| IUPAC name
| Systematic IUPAC name
| Other names
Methyl ester of acetic acid
|Molar mass||74.08 g/mol|
|Odor||Fragrant, fruity, nail polisher-like|
|Density||0.9342 g/cm3 (at 20 °C)|
|Melting point||−98 °C (−144 °F; 175 K)|
|Boiling point||56.9 °C (134.4 °F; 330.0 K)|
|24.4 g/100 ml (at 20 °C)|
|Solubility||Miscible with alcohols, ethers, ketones|
|Vapor pressure||173 mmHg (at 20°C)|
|Safety data sheet||ScienceLab|
|Flash point||−10 °C|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|3700 mg/kg (oral, rabbit)|
LC50 (Median concentration)
| 11,039 ppm (mouse, 4 hr)|
21,753 ppm (cat, 1 hr)
32,000 ppm (rat, 4 hr)
| Methyl formate|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Methyl acetate (or MeOAc) is an organic compound which is liquid at room temperature and widely used as a solvent. It has the chemical formula CH3COOCH3. Methyl acetate is the ester of acetic acid and methanol.
Methyl acetate is carbonylated under high pressure (50 atm) and temperature (190 °C) to yield acetic anhydride:
- CH3CO2CH3 + CO → (CH3CO)2O
This reaction takes place in the presence of various catalysts.
Methyl acetate is a volatile colorless liquid, somewhat soluble in water (25%) and miscible with other organic solvents such as alcohols and ethers. Methyl acetate has a melting point of −98 °C. Its boiling point of 56.9 °C is very close to that of acetone (56.05 °C).
Methyl acetate is found in various paint thinners and sometimes in nail polishers. Fractional distillation is required to separate it.
Methyl acetate is sometimes found mixed with ethyl acetate, in certain (poly)urethane strippers.
Methyl acetate can be made via Fischer esterification, between anhydrous methanol and glacial acetic acid. A catalyst such as sulfuric acid is used, though iron(III) sulfate can also be used. The process takes place under reflux. After the reaction has ended, leftover acetic acid is neutralized using sodium bicarbonate. The crude methyl acetate is extracted using a separatory funnel and dried using calcium chloride. If required, the methyl acetate can be further purified via fractionated distillation.
For better yield, acetic anhydride can be used instead of acetic acid.
- Organic extractions
- Acetic anhydride synthesis
Methyl acetate is flammable. While it is considered a mild skin irritant, methyl acetate poses little toxicity.
Methyl acetate should be stored in closed bottles, and kept away from moisture, acidic vapors and bases. Due to its relative low boiling point, it's best to keep it in a cool place, especially during summer.
Methyl acetate can be safely burned, preferably outside. Hydrolysis yields acetic acid and methanol which can either be recovered or destroyed.