3-Hexyne-2,5-diol
3-Hexyne-2,5-diol (CAS: 3031-66-1) is a diol featuring an internal alkyne. With a molecular weight of 114.14 g/mol, this compound is primarily utilised as a monomer in polymer science and materials science. Its unique structure allows for versatile chemical modifications, making it a valuable intermediate in organic synthesis and a building block for advanced materials.
- Synonyms
- CH3CH(OH)C≡CCH(OH)CH3

Polymer Science
Serves as a monomer or co-monomer in the synthesis of specialty polymers, contributing unique structural and functional properties to the polymer backbone.
Materials Science
Acts as a building block for novel materials, enabling the development of advanced polymers with tailored characteristics for specific applications.
Organic Synthesis Intermediate
Utilised as a reactive intermediate in complex organic synthesis pathways, particularly where alkyne and diol functionalities are required.
| Molecular weight | 114.14 |
|---|---|
| Linear formula | CH3CH(OH)C≡CCH(OH)CH3 |
| Assay | 97% |
| Boiling point | 121 °C/15 mmHg(lit.) |
| Density | 1.009 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.473(lit.) |
| Melting point | 42 °C(lit.) |


Hazard statements
- H301Toxic if swallowed
- H318Causes serious eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P301IF SWALLOWED
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges |
|---|---|
| Flash point | 123 °C / 253.4 °F |
| Transport (UN / ADR) | UN 2811 6.1 / PGIII |
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | T |
| Risk statements (R) | 25-36 |
| Safety statements (S) | 26-36/37/39-45 |
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-Hexyne-2,5-diol used for?
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3-Hexyne-2,5-diol is used as a monomer in polymer science and materials science, and as an intermediate in organic synthesis.
What is the CAS number and formula for 3-Hexyne-2,5-diol?
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The CAS number is 3031-66-1 and the linear formula is CH3CH(OH)C≡CCH(OH)CH3.
What grade and purity does Tech Serve Solutions supply for 3-Hexyne-2,5-diol?
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Tech Serve Solutions supplies 3-Hexyne-2,5-diol with an assay of 97%. This is typically considered a technical or research grade, and we do not represent it as USP, BP, or EP grade.
What are the primary safety concerns when handling 3-Hexyne-2,5-diol?
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3-Hexyne-2,5-diol is classified as Dangerous (Signal Word: Danger) due to its corrosive nature and potential to cause serious eye damage (H318) and toxicity if swallowed (H301). Appropriate personal protective equipment, including eyeshields, face shields, and gloves, along with respiratory protection, is essential.
How is 3-Hexyne-2,5-diol typically packaged and shipped?
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3-Hexyne-2,5-diol is packaged according to industry standards for hazardous chemicals and can be exported globally by Tech Serve Solutions.
How can I request a sample or quote for 3-Hexyne-2,5-diol?
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Please contact our sales department through the website to request a sample or obtain a quotation for 3-Hexyne-2,5-diol.
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