3-Ethynylbenzaldehyde
3-Ethynylbenzaldehyde (CAS: 77123-56-9, C9H6O) is a versatile aromatic aldehyde featuring a terminal alkyne group. This compound serves as a valuable building block in organic synthesis, facilitating the construction of complex molecular architectures. Its bifunctional nature allows for diverse chemical transformations, making it a key intermediate in the development of pharmaceuticals, advanced materials, and fine chemicals. TSS provides this compound with a high purity, suitable for demanding research and development applications.
- IUPAC
- (3-Formylphenyl)acetylene
- Synonyms
- (3-Formylphenyl)acetylene

Organic Synthesis Intermediate
Serves as a crucial building block for constructing complex organic molecules. The presence of both an aldehyde and a terminal alkyne allows for a wide range of subsequent chemical modifications, including coupling reactions and condensation chemistry.
Pharmaceutical Research
Utilised in the synthesis of novel pharmaceutical agents and drug discovery programmes. Its structure can be incorporated into potential therapeutic candidates, offering pathways to new medicinal compounds.
Materials Science
Employable in the development of advanced materials, such as polymers and functional organic frameworks. The alkyne moiety can participate in polymerisation reactions or be used for surface functionalisation.
Fine Chemical Production
Acts as a precursor in the manufacturing of specialised fine chemicals. Its unique structure enables the efficient synthesis of target molecules for various industrial applications.
| Molecular weight | 130.14 |
|---|---|
| Empirical formula | C9H6O |
| Assay | 97% |
| Melting point | 75-80 °C |

Hazard statements
- H302Harmful if swallowed
- H317May cause an allergic skin reaction
- H319Causes serious eye irritation
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Water hazard class (WGK, DE) | 1 |
|---|---|
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-36-43 |
| Safety statements (S) | 26-36/37 |
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 3-Ethynylbenzaldehyde used for?
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3-Ethynylbenzaldehyde is primarily used as a building block in organic synthesis, particularly in pharmaceutical research, materials science, and fine chemical production, owing to its aldehyde and terminal alkyne functionalities.
What is the CAS number and formula for 3-Ethynylbenzaldehyde?
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The CAS number for 3-Ethynylbenzaldehyde is 77123-56-9, and its molecular formula is C9H6O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-Ethynylbenzaldehyde with a minimum assay of 97%. We do not represent this product as USP, BP, EP, or any other pharmacopoeia grade.
How should 3-Ethynylbenzaldehyde be handled safely?
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3-Ethynylbenzaldehyde is classified with GHS07, with a Warning signal word. It is harmful if swallowed (H302), may cause an allergic skin reaction (H317), and causes serious eye irritation (H319). Handle with appropriate personal protective equipment, including gloves and eye protection, and avoid ingestion or skin contact. Ensure adequate ventilation.
Is 3-Ethynylbenzaldehyde available for export?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 3-Ethynylbenzaldehyde, and can facilitate international shipments.
How can I request a sample or quote for 3-Ethynylbenzaldehyde?
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To request a sample or a quote for 3-Ethynylbenzaldehyde, please contact our sales team through the TSS website or by calling our main office.
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