3-Methyl-1-penten-3-ol
3-Methyl-1-penten-3-ol (CAS: 918-85-4) is an organic compound with the formula C2H5C(CH3)(OH)CH=CH2 and a molecular weight of 100.16 g/mol. This acyclic tertiary alcohol and alkene is a valuable building block in organic synthesis. It is primarily utilised as a reagent or intermediate in the development of more complex chemical structures for research and industrial applications.

Organic Synthesis Intermediate
3-Methyl-1-penten-3-ol serves as a versatile intermediate in the synthesis of various organic compounds. Its unique structure featuring both an alkene and a tertiary alcohol functional group allows for diverse chemical transformations.
Building Block for Complex Molecules
This compound acts as a fundamental building block in constructing more intricate molecular architectures. It is employed in research laboratories for developing novel compounds with potential applications in materials science or pharmaceuticals.
Reagent in Chemical Research
Utilised as a reagent, 3-Methyl-1-penten-3-ol contributes to a range of chemical reactions. Its properties make it suitable for specific synthetic pathways explored by academic and industrial researchers.
| Molecular weight | 100.16 |
|---|---|
| Linear formula | C2H5C(CH3)(OH)CH=CH2 |
| Assay | 99% |
| Boiling point | 117-118 °C(lit.) |
| Density | 0.838 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.428(lit.) |


Hazard statements
- H226Flammable liquid and vapour
- H302Harmful if swallowed
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 26 °C / 78.8 °F |
| Transport (UN / ADR) | UN 1987C 3 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 10-22 |
| Safety statements (S) | 16-36 |
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 3-Methyl-1-penten-3-ol used for?
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3-Methyl-1-penten-3-ol is used as an intermediate and building block in organic synthesis, and as a reagent in chemical research.
What is the CAS number and formula for 3-Methyl-1-penten-3-ol?
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The CAS number is 918-85-4 and the molecular formula is C2H5C(CH3)(OH)CH=CH2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-Methyl-1-penten-3-ol with an assay of 99%. This is a technical/research grade chemical, and TSS does not represent it as USP, BP, or EP grade.
How should 3-Methyl-1-penten-3-ol be handled?
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3-Methyl-1-penten-3-ol is a flammable liquid and vapour (H226) and harmful if swallowed (H302). Handle with appropriate personal protective equipment, including eyeshields, gloves, and suitable respiratory protection, in a well-ventilated area, away from ignition sources.
Is 3-Methyl-1-penten-3-ol a controlled substance?
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Based on the provided data, 3-Methyl-1-penten-3-ol is not indicated as a controlled substance.
How is 3-Methyl-1-penten-3-ol packed and shipped?
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3-Methyl-1-penten-3-ol is shipped according to UN 1987, Class 3, Packing Group III regulations. Specific packaging details are available upon request.
How can I request a sample or quote?
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To request a sample or quote for 3-Methyl-1-penten-3-ol, please contact our sales team through the website or by phone.
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