4-Methyl-1-pentyne
4-Methyl-1-pentyne (CAS: 7154-75-8) is a terminal alkyne with the molecular formula C6H10 and a molecular weight of 82.14 g/mol. This flammable liquid, identified by its distinctive refractive index and boiling point, serves as a valuable building block in organic synthesis. It is utilized in chemical research and the development of more complex molecular structures across various scientific disciplines.
- IUPAC
- Isobutyl acetylene
- Synonyms
- Isobutyl acetylene

Organic Synthesis Intermediate
4-Methyl-1-pentyne functions as a key intermediate in the synthesis of diverse organic compounds. Its terminal alkyne functionality allows for facile participation in addition reactions, cyclizations, and coupling chemistries.
Research and Development
This compound is employed in academic and industrial research laboratories for the exploration of new synthetic methodologies and the creation of novel chemical entities. Its specific structure makes it useful for structure-activity relationship studies.
Building Block for Complex Molecules
As a versatile building block, 4-Methyl-1-pentyne contributes to the construction of larger, more intricate molecular architectures. It is particularly useful in the preparation of specialised reagents and materials.
| Molecular weight | 82.14 |
|---|---|
| Linear formula | CH≡CCH2CH(CH3)2 |
| Assay | 98% |
| Boiling point | 61-62 °C(lit.) |
| Density | 0.698 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.393(lit.) |

Hazard statements
- H225Highly flammable liquid and vapour
Precautionary statements
- P210Keep away from heat, sparks and open flames. No smoking
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US) |
|---|---|
| Flash point | -4 °C / 24.8 °F |
| Transport (UN / ADR) | UN 1993BE 3 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | F |
| Risk statements (R) | 11 |
| Safety statements (S) | 16-33 |
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 4-Methyl-1-pentyne used for?
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4-Methyl-1-pentyne is primarily used as a building block in organic synthesis and for research and development purposes in creating new chemical entities.
What are the CAS number and formula for 4-Methyl-1-pentyne?
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The CAS number for 4-Methyl-1-pentyne is 7154-75-8, and its linear formula is CH≡CCH2CH(CH3)2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Methyl-1-pentyne with an assay of 98%. We do not represent this product as USP, BP, or EP grade.
How should 4-Methyl-1-pentyne be handled safely?
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4-Methyl-1-pentyne is a highly flammable liquid and vapour (H225) that requires careful handling. Use in a well-ventilated area, away from ignition sources, and wear appropriate personal protective equipment including eyeshields, gloves, and respiratory protection.
How is 4-Methyl-1-pentyne shipped by Tech Serve Solutions?
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4-Methyl-1-pentyne is shipped as a flammable liquid, UN 1993, Packing Group II, in compliance with transportation regulations.
How can I request a sample or quote for 4-Methyl-1-pentyne?
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To request a sample or a quote for 4-Methyl-1-pentyne, please contact our sales team via the website or by telephone.
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