1-Pentyn-3-ol
1-Pentyn-3-ol (CAS: 4187-86-4), with the molecular formula C2H5CH(OH)C≡CH and a molecular weight of 84.12 g/mol, is a secondary alcohol featuring a terminal alkyne functionality. This versatile organic compound serves as a valuable building block in chemical synthesis, particularly in the construction of more complex molecules within organic chemistry research and development. Its unique structure makes it amenable to various chemical transformations.

Organic Synthesis
1-Pentyn-3-ol is utilised as an intermediate in the synthesis of various organic compounds. The presence of both a hydroxyl group and a terminal alkyne allows for diverse reactions, including alkynylation and further functional group modifications.
Building Block for Complex Molecules
This compound serves as a fundamental building block in multi-step syntheses. Its specific structure can be incorporated into larger molecular frameworks, contributing to the development of novel chemical entities in research laboratories.
Research and Development
Primarily used in academic and industrial research settings, 1-Pentyn-3-ol aids in exploring new reaction pathways and creating new chemical substances. Its properties are of interest in the fields of synthetic organic chemistry.
| Molecular weight | 84.12 |
|---|---|
| Linear formula | C2H5CH(OH)C≡CH |
| Assay | 98% |
| Density | 0.975 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.434(lit.) |
| Vapour density | 1 (vs air) |


Hazard statements
- H226Flammable liquid and vapour
- H301Toxic if swallowed
- H311Toxic in contact with skin
- H331Toxic if inhaled
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P301IF SWALLOWED
- P311Call a POISON CENTER or doctor
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 29 °C / 84.2 °F |
| Transport (UN / ADR) | UN 1986 3/PG 3 |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T |
| Risk statements (R) | 10-23/24/25 |
| Safety statements (S) | 16-36/37/39-45 |
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 1-Pentyn-3-ol used for?
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1-Pentyn-3-ol is primarily used as a building block in organic synthesis and in research and development for creating more complex organic molecules.
What is the CAS number and molecular formula for 1-Pentyn-3-ol?
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The CAS number for 1-Pentyn-3-ol is 4187-86-4, and its molecular formula is C2H5CH(OH)C≡CH.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 1-Pentyn-3-ol with an assay of 98%. This product is typically considered a technical or research grade, and TSS does not represent it as meeting USP, BP, or EP pharmacopoeial standards.
How should 1-Pentyn-3-ol be handled safely?
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1-Pentyn-3-ol is a flammable liquid and toxic by inhalation, in contact with skin, and if swallowed. Handling requires stringent safety precautions including appropriate personal protective equipment like eyeshields, gloves, and a full-face or combination respirator. Work should be conducted in a well-ventilated area, away from ignition sources.
Is 1-Pentyn-3-ol shipped internationally?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, including 1-Pentyn-3-ol, and can fulfil international orders.
How can I request a sample or quote for 1-Pentyn-3-ol?
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To request a sample or a quotation for 1-Pentyn-3-ol, please contact our sales team through the website or by phone, providing your specific requirements.
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