trans-Cinnamic acid
trans-Cinnamic acid (CAS 140-10-3), with the molecular formula C₉H₈O₂, is a white crystalline solid. This unsaturated carboxylic acid is a valuable building block in organic synthesis. It is found naturally in plants like cinnamon and is utilized in the fragrance, flavour, and pharmaceutical industries, as well as in cosmetic formulations. Its chemical structure facilitates various reactions, making it a versatile intermediate.
- IUPAC
- trans-3-Phenylacrylic acid
- Synonyms
- trans-3-Phenylacrylic acid(E)-3-Phenylprop-2-enoic acidCinnamic acid

Fragrance and Flavour Industry
trans-Cinnamic acid serves as a precursor for the synthesis of various flavouring agents and fragrance compounds, contributing to pleasant aromas and tastes in consumer products.
Pharmaceutical Intermediates
It acts as a key building block in the synthesis of active pharmaceutical ingredients (APIs) and other medicinal compounds, supporting drug discovery and development processes.
Cosmetics and Personal Care
The compound finds application in cosmetic formulations, potentially for its fragrance properties or as an ingredient in skincare products.
Organic Synthesis
As a versatile organic building block, trans-cinnamic acid is employed in a wide range of chemical synthesis pathways for creating more complex molecules.
| Molecular weight | 148.16 |
|---|---|
| Linear formula | C6H5CH=CHCOOH |
| Assay | ≥99.0% (T) |
| Melting point | 133 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Flash point | 100 °C / 212 °F |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is trans-Cinnamic acid used for?
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trans-Cinnamic acid is used as a building block in organic synthesis, in the fragrance and flavour industries, as a pharmaceutical intermediate, and in cosmetic formulations.
What is the CAS number and molecular formula for trans-Cinnamic acid?
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The CAS number is 140-10-3, and the molecular formula is C₉H₈O₂.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies trans-Cinnamic acid with an assay of ≥99.0% (T). We do not represent this product as USP, BP, or EP grade.
What are the safety and handling recommendations for trans-Cinnamic acid?
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trans-Cinnamic acid is a Warning substance that causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). Use a dust mask type N95, eyeshields, and gloves. Avoid breathing dust. P261: Avoid breathing dust. P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
How is trans-Cinnamic acid packed, shipped, and exported?
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Tech Serve Solutions exports fine chemicals globally, ensuring appropriate packaging for safe transport according to international regulations.
How can I request a sample or quote for trans-Cinnamic acid?
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Please contact our sales team via the website or direct inquiry to request a sample or a quotation for trans-Cinnamic acid.
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