5-Hexynoic acid
5-Hexynoic acid (CAS: 53293-00-8; Formula: CH≡C(CH₂)₃CO₂H; Molar Mass: 112.13 g/mol) is a valuable terminal alkyne carboxylic acid. It serves as a versatile building block in organic synthesis, particularly in the construction of complex molecules through reactions involving its triple bond and carboxylic acid functionality. Its structure makes it an important intermediate for further chemical transformations and research applications.

Organic Synthesis Intermediate
5-Hexynoic acid is employed as a key intermediate in the synthesis of various organic compounds. Its terminal alkyne can undergo diverse reactions such as cycloadditions, coupling reactions, and hydration, while the carboxylic acid group can be functionalised into esters, amides, or acid halides.
Material Science Research
The unique combination of an alkyne and a carboxylic acid moiety makes 5-Hexynoic acid a potential monomer or building block in the development of novel polymers and advanced materials. It can be incorporated into polymer backbones or side chains to impart specific properties.
Pharmaceutical and Agrochemical Development
This compound can serve as a precursor for the synthesis of biologically active molecules. Its structure allows for the introduction of both alkyne and carboxylic acid functionalities into potential drug candidates or agrochemical agents during the research and development phases.
| Molecular weight | 112.13 |
|---|---|
| Linear formula | CH≡C(CH2)3CO2H |
| Assay | 97% |
| Boiling point | 224-225 °C(lit.) |
| Density | 1.016 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.449(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 | Eyeshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 110 °C / 230 °F |
| Water hazard class (WGK, DE) | 3 |
| 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 5-Hexynoic acid used for?
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5-Hexynoic acid is primarily used as a building block in organic synthesis for creating more complex molecules and as an intermediate in pharmaceutical and material science research.
What are the CAS number and chemical formula for 5-Hexynoic acid?
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The CAS number for 5-Hexynoic acid is 53293-00-8, and its chemical formula is CH≡C(CH₂)₃CO₂H.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 5-Hexynoic acid with a minimum purity of 97%. We do not represent this product as USP, BP, or EP grade unless explicitly stated in the product specifications.
How should 5-Hexynoic acid be handled safely?
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5-Hexynoic acid is a Warning substance (GHS07) with hazards H315 (causes skin irritation), H319 (causes serious eye irritation), and H335 (may cause respiratory irritation). Appropriate personal protective equipment, including eyeshields and gloves, should be worn, and handling should occur in a well-ventilated area.
Is 5-Hexynoic acid a controlled substance?
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The provided data does not indicate that 5-Hexynoic acid is a controlled substance.
How is 5-Hexynoic acid typically packed and shipped?
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Tech Serve Solutions exports fine chemicals globally. Specific packing and shipping details will be provided based on order size and destination requirements.
How can I request a sample or quote for 5-Hexynoic acid?
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To request a sample or quote for 5-Hexynoic acid, please contact our sales team through the website or by phone, providing your specific requirements.
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