Phenyl Acetate - Aromatic Ester for Fragrance and Synthesis

Phenyl Acetate (CAS 122-79-2): Chemical Properties

1. Definition and Characteristics

Phenyl acetate is an ester of phenylacetic acid with the general equation acid + alcohol → ester + water.

CAS: 122-79-2

Synonyms: Phenylacetate, Phenyl ethanoate

2. Molecular Formula and Structural Features

Molecular formula: C₈H₈O₂

Chemical structure: Benzene ring attached to a carbonyl group via a methylene bridge (—CH₂—), forming an ester.

3. Physicochemical Properties

Appearance: Colorless or pale yellow liquid.

Odor: Sweet, fruity-balsamic, reminiscent of pear or honey.

Density: ~1.08 g/cm³ (at 20°C).

Boiling point: ~196–198°C at atmospheric pressure.

Melting point: Approximately –31°C.

Flash point: ~84–88°C (closed cup).

Solubility:

• In water: Limited.

• In organic solvents (ethers, alcohols): Readily soluble.

Decomposition: Upon thermolysis or combustion, releases vapors of phenol, benzene, and other toxic compounds.

Storage conditions: Store in tightly sealed containers, avoid contact with oxidizers, keep away from open flames.

Stability: Stable under normal conditions, but sensitive to hydrolysis in alkaline media.

4. Applications

Fragrances and perfumery: Valued for its soft floral aroma; often used to mask harsh odors.

Food essences: Imparts fruity notes in candies, chewing gums.

Pharmaceuticals: Derivatives of phenylacetic acid and its esters may serve as starting reagents in synthetic chemistry.

Chemical reactions: Used as an intermediate in organic synthesis.

5. Potential Health and Environmental Impact

Toxicity: Inhalation of high concentrations may cause respiratory and mucous membrane irritation; ingestion may cause gastrointestinal disorders.

Ecology: When released into water bodies, it rapidly hydrolyzes, but large volumes may create localized issues.

6. Conclusion

Phenyl acetate (CAS 122-79-2) is an aromatic ester with a characteristic fruity odor, widely used in perfumery and the food industry. Due to its stability and relatively easy synthetic accessibility, the substance has retained its industrial and commercial significance. Proper storage and handling are essential to maintain quality and reduce risks.