4-Phenyl-3-butyn-2-one
4-Phenyl-3-butyn-2-one (CAS 1817-57-8), with the molecular formula C6H5C≡CCOCH3 and a molecular weight of 144.17 g/mol, is a phenylacetylene derivative. This carbonyl compound functions as a versatile building block in organic synthesis. It is primarily utilised in chemical research and development for the construction of more complex molecular architectures, particularly within the realms of medicinal chemistry and materials science.

Organic Synthesis Intermediate
This compound serves as a valuable intermediate in various organic transformations, enabling the formation of carbon-carbon and carbon-heteroatom bonds. Its unique structure allows for diverse synthetic routes.
Research and Development
Utilised in academic and industrial research laboratories for the exploration of novel chemical reactions and the development of new compounds with potential applications in pharmaceuticals and materials.
Building Block for Heterocycles
The presence of both an alkyne and a ketone moiety makes it a suitable precursor for the synthesis of various heterocyclic compounds through cyclization reactions.
| Molecular weight | 144.17 |
|---|---|
| Linear formula | C6H5C≡CCOCH3 |
| Assay | 96% |
| Boiling point | 75-76 °C/0.8 mmHg(lit.) |
| Density | 0.99 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.574(lit.) |
| Storage temperature | 2-8°C |

Hazard statements
- H302Harmful if swallowed
| Flash point | 95 °C / 203 °F |
|---|---|
| Transport (UN / ADR) | UN 3334 |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22 |
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 4-Phenyl-3-butyn-2-one used for?
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4-Phenyl-3-butyn-2-one is primarily used as a building block and intermediate in organic synthesis, particularly in research and development for creating complex molecules and heterocyclic compounds.
What is the CAS number and molecular formula for 4-Phenyl-3-butyn-2-one?
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The CAS number is 1817-57-8 and the molecular formula is C6H5C≡CCOCH3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Phenyl-3-butyn-2-one with an assay of 96%. We do not represent this product as USP, BP, EP, or any other pharmacopoeia grade unless explicitly stated.
How should 4-Phenyl-3-butyn-2-one be handled safely?
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4-Phenyl-3-butyn-2-one is classified as harmful if swallowed (H302) and requires careful handling. Wear appropriate personal protective equipment, including gloves and eye protection. Store at 2-8°C.
How is 4-Phenyl-3-butyn-2-one packed and exported?
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Tech Serve Solutions packs and exports chemicals with strict adherence to international shipping regulations to ensure safe and secure delivery worldwide.
How can I request a quote or sample?
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To request a quote or a sample of 4-Phenyl-3-butyn-2-one, please contact our sales team via the website or by phone with your inquiry.
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