1-Ethynyl-3-fluorobenzene
1-Ethynyl-3-fluorobenzene (CAS: 2561-17-3), with the molecular formula C₈H₅F and a molecular weight of 120.12 g/mol, is a fluorinated aromatic compound featuring an ethynyl group. This chemical serves as a valuable building block in organic synthesis, particularly for creating complex molecules in the pharmaceutical and materials science sectors. Its reactive alkyne functionality and the presence of fluorine offer unique opportunities for further chemical transformations and the development of novel compounds.

Organic Synthesis Intermediate
Utilised as a key intermediate in the synthesis of more complex organic molecules. Its structure is amenable to various reactions, including coupling and cycloaddition, making it versatile for creating novel chemical entities.
Pharmaceutical Research and Development
Employed in the development of new pharmaceutical agents. The fluorophenylacetylene moiety can be incorporated into drug candidates to modulate pharmacokinetic properties or enhance binding affinity.
Materials Science
Can be used in the synthesis of functional materials, such as polymers or organic electronic components, where the fluorine atom and alkyne group can impart specific desired properties.
Chemical Reagent
Serves as a reagent in various chemical transformations within research laboratories. Its specific reactivity profile makes it a useful tool for synthetic chemists exploring new reaction pathways.
| Molecular weight | 120.12 |
|---|---|
| Linear formula | FC6H4C≡CH |
| Assay | 98% |
| Boiling point | 138 °C(lit.) |
| Density | 1.039 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.5170(lit.) |


Hazard statements
- H226Flammable liquid and vapour
- 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 | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 32 °C / 89.6 °F |
| Transport (UN / ADR) | UN 1993C 3 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 10-36/37/38 |
| Safety statements (S) | 16-26-36 |
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 1-Ethynyl-3-fluorobenzene primarily used for?
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1-Ethynyl-3-fluorobenzene is primarily used as an intermediate and building block in organic synthesis, particularly in the research and development of pharmaceuticals and advanced materials.
What are the CAS number and molecular formula for 1-Ethynyl-3-fluorobenzene?
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The CAS number for 1-Ethynyl-3-fluorobenzene is 2561-17-3, and its molecular formula is FC₆H₄C≡CH (C₈H₅F).
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions typically supplies 1-Ethynyl-3-fluorobenzene with an assay of 98%. This product is intended for research and chemical synthesis purposes and is not represented as USP, BP, EP, or any other pharmacopoeia grade.
How should 1-Ethynyl-3-fluorobenzene be handled safely?
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1-Ethynyl-3-fluorobenzene is a flammable liquid and vapour (H226) and can cause skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Handle with appropriate personal protective equipment, including gloves, safety glasses, and use in a well-ventilated area or fume hood. Refer to the Safety Data Sheet for comprehensive handling information.
Is 1-Ethynyl-3-fluorobenzene a controlled substance?
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Based on the provided data, 1-Ethynyl-3-fluorobenzene is not indicated as a controlled substance.
How is 1-Ethynyl-3-fluorobenzene packed, shipped, and exported?
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1-Ethynyl-3-fluorobenzene is packed according to industry standards for flammable liquids. As a global supplier, Tech Serve Solutions exports this chemical internationally, adhering to all relevant shipping regulations for hazardous materials.
How can I request a quote or sample for 1-Ethynyl-3-fluorobenzene?
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To request a quote or a sample of 1-Ethynyl-3-fluorobenzene, please visit the Tech Serve Solutions website or contact our sales department directly with your inquiry.
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