CAS Number: 140‑10‑3
Synonyms: Cinnamic acid; Trans-cinnamic acid; 3-Phenylacrylic acid; Phenylpropenoic acid
Chemical Formula:C₉H₈O₂
Product Introduction
Cinnamic acid is a white or off-white crystalline unsaturated aromatic carboxylic acid, commonly found in cinnamon oil and balsams. The trans-isomer is commercially dominant. Used in flavors, fragrances, pharmaceuticals, and polymer applications.
| Property | Value |
|---|---|
| Appearance | White monoclinic crystalline solid |
| Odor | Sweet, balsamic, honey-like |
| Density @ 20 °C | ~1.2475 g/cm³ |
| Melting Point | ~133 °C |
| Boiling Point | ~300 °C |
| Solubility in Water @ 25 °C | ~0.4–0.5 g/L (slightly soluble) |
| Refractive Index (n₂₀ᴅ) | ~1.505 |
| Molecular Weight | 148.16 g/mol |
| pKa | ~4.44 (carboxyl) |
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