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Ethyl 3-phenylpropionate
1. Basic Information
Name: Ethyl 3-phenylpropionate
Alias: Ethyl hydrocinnamate, Ethyl β-phenylpropionate
CAS No.: 2021-28-5
Molecular Formula: C11H14O2
Molecular Weight: 178.23
Category: Synthetic fragrance raw material, fine chemical intermediate, flavor additive, organic synthesis substrate
2. Physical and Chemical Properties
Physical Properties
- Appearance: Colorless transparent oily liquid
- Odor: Mild sweet balsamic and floral fragrance, similar to cinnamon and honey aroma
- Solubility: Miscible with ethanol, methanol, acetone, dichloromethane, toluene; slightly soluble in water
- Boiling Point: 247–249 °C (760 mmHg)
- Density (20 °C): 1.012–1.016 g/cm3
- Refractive Index nD20: 1.494–1.497
- Hygroscopy: Non-hygroscopic
- Aqueous property: Neutral aliphatic aromatic ester, stable in neutral cold water at room temperature
Chemical Properties
- Molecular structure: Ethyl ester of 3-phenylpropanoic acid, containing benzene ring and saturated ester functional group
- Ester reactivity: Undergoes hydrolysis under acidic or alkaline heating conditions to produce 3-phenylpropionic acid and ethanol; can conduct transesterification reaction
- Thermal stability: Stable below 200 °C; long-time heating near boiling point leads to slight oxidative yellowing
- Photostability: Slightly light-sensitive; long-term strong light exposure deepens liquid color
- Compatibility: Good compatibility with most flavor solvents, resin and oil phases; incompatible with concentrated strong alkali under high temperature
3. Main Application Fields
1. Food & Daily Flavor Raw Material (Core Application)
Widely used in cream, fruit, honey, vanilla and floral essence formulations for candy, beverage, perfume, soap and cosmetics
2. Pharmaceutical Synthetic Intermediate
Precursor for synthesizing phenylpropionic acid derivatives, central nervous system drug intermediates
3. Organic Synthesis Laboratory Reagent
Standard substrate for ester hydrolysis, reduction and aromatic side chain modification research
4. Coating & Fragrance Fixative Auxiliary
Low-volatility fixative additive to enhance fragrance lasting performance in daily chemical products
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 2021-28-5 |
| Molecular Formula | C11H14O2 |
| Appearance | Colorless clear oily liquid without suspended impurities |
| GC Purity | Flavor Grade ≥99.0%, Synthetic Grade ≥98.5% |
| Water Content (KF) | ≤0.10% |
| Chroma (APHA) | ≤30 |
| Acid Value | ≤0.1 mgKOH/g |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | Amber light-proof glass bottle; bulk 200kg sealed iron drum |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 °C, light shielding, isolate strong alkaline materials |
| Transportation Requirement | Slightly light-sensitive aromatic ester liquid, conventional sealed packaging, separated from strong corrosive alkali products |
| Shelf Life | 24 months under nitrogen sealed storage |
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