5-Methyl-5-hexen-2-one
5-Methyl-5-hexen-2-one (CAS: 3240-09-3) is an organic compound with the linear formula H₂C=C(CH₃)CH₂CH₂COCH₃ and a molecular weight of 112.17 g/mol. This unsaturated ketone serves as a valuable building block in organic synthesis. Its primary documented application is in the preparation of (±)-grandisol, a significant natural product.

Synthesis of (±)-Grandisol
5-Methyl-5-hexen-2-one is a key intermediate in the synthesis of (±)-grandisol. This pheromone, found in various insects, is of interest in agricultural pest management and chemical research.
Organic Building Block
As a functionalised ketone with an alkene moiety, this compound is a versatile building block for constructing more complex organic molecules in research and development settings.
Carbonyl Compound Chemistry
The presence of the ketone functional group allows for a range of reactions characteristic of carbonyl compounds, enabling further derivatisation and functional group transformations.
| Molecular weight | 112.17 |
|---|---|
| Linear formula | H2C=C(CH3)CH2CH2COCH3 |
| Assay | 99% |
| Boiling point | 148-149 °C(lit.) |
| Density | 0.865 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.431(lit.) |
| Application | Used in the synthesis of (±)-grandisol.1 |



Hazard statements
- H226Flammable liquid and vapour
- H302Harmful if swallowed
- H318Causes serious eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Flash point | 42 °C / 107.6 °F |
|---|---|
| Transport (UN / ADR) | UN 1224C 3 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 10-22-41 |
| Safety statements (S) | 26-39 |
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-Methyl-5-hexen-2-one used for?
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5-Methyl-5-hexen-2-one is primarily used in organic synthesis, notably as an intermediate in the preparation of (±)-grandisol. It also serves as a general building block in chemical synthesis.
What are the CAS number and molecular formula for 5-Methyl-5-hexen-2-one?
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The CAS number for 5-Methyl-5-hexen-2-one is 3240-09-3. Its linear molecular formula is H₂C=C(CH₃)CH₂CH₂COCH₃.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 5-Methyl-5-hexen-2-one with an assay of 99%. This product is not classified as USP, BP, or EP grade.
How should 5-Methyl-5-hexen-2-one be handled safely?
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5-Methyl-5-hexen-2-one is a flammable liquid and vapour (H226), is harmful if swallowed (H302), and causes serious eye damage (H318). Handle with appropriate personal protective equipment, ensuring adequate ventilation and avoiding ignition sources. Refer to the Safety Data Sheet for comprehensive handling information.
Is 5-Methyl-5-hexen-2-one shipped internationally?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, including 5-Methyl-5-hexen-2-one.
How can I request a quote or sample?
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Please contact the Tech Serve Solutions sales team via our website or direct inquiry channels to request a quotation or a sample of 5-Methyl-5-hexen-2-one.
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