2,3-Dimethyl-1-butene
2,3-Dimethyl-1-butene (CAS 563-78-0) is a volatile, flammable acyclic alkene with the molecular formula (CH3)2CHC(CH3)=CH2 and a molecular weight of 84.16 g/mol. This organic building block is recognised for its utility in chemical synthesis and has been employed in research to investigate mechanisms, such as the sulfur vulcanisation of rubber. Tech Serve Solutions supplies this compound with a purity of ≥98.0% (GC).
- Synonyms
- (CH3)2CHC(CH3)=CH2

Rubber Vulcanisation Research
2,3-Dimethyl-1-butene has been utilised in scientific studies to elucidate the intricate mechanisms involved in the sulfur vulcanisation process of rubber, a critical step in enhancing rubber's durability and elasticity.
Organic Synthesis Building Block
As an acyclic alkene, this compound serves as a versatile building block in organic synthesis, enabling the construction of more complex molecular architectures through various chemical transformations.
Chemical Research and Development
Its specific chemical structure makes 2,3-Dimethyl-1-butene a valuable reagent in diverse chemical research and development projects, particularly where the introduction of a branched alkene moiety is required.
| Molecular weight | 84.16 |
|---|---|
| Linear formula | (CH3)2CHC(CH3)=CH2 |
| Assay | ≥98.0% (GC) |
| Boiling point | 56 °C(lit.) |
| Density | 0.68 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.389(lit.)n20/D 1.391 |
| Vapour pressure | 412 mmHg (37.7 °C) |
| Melting point | −158 °C(lit.) |
| Autoignition temp | 680 °F |
| Contains / stabiliser | ~0.05% 2,6-di-tert-butyl-4-methylphenol as stabilizer |
| Application | 2,3-Dimethyl-1-butene was used to investigate the mechanism of the sulfur vulcanization of rubber1. |


Hazard statements
- H225Highly flammable liquid and vapour
- H304May be fatal if swallowed and enters airways
Precautionary statements
- P210Keep away from heat, sparks and open flames. No smoking
- P301IF SWALLOWED
- P331Do NOT induce vomiting
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US) |
|---|---|
| Flash point | -18 °C / -.4 °F |
| Transport (UN / ADR) | UN 3295BF 3 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | F,Xn |
| Risk statements (R) | 11-65 |
| Safety statements (S) | 16-33-62 |
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 2,3-Dimethyl-1-butene used for?
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2,3-Dimethyl-1-butene is used as a building block in chemical synthesis and has been investigated for its role in the mechanism of sulfur vulcanisation of rubber.
What is the CAS number and chemical formula for 2,3-Dimethyl-1-butene?
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The CAS number for 2,3-Dimethyl-1-butene is 563-78-0, and its linear formula is (CH3)2CHC(CH3)=CH2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 2,3-Dimethyl-1-butene with an assay of ≥98.0% (GC). This product is not supplied as USP, BP, or EP grade unless explicitly stated and verified.
What are the primary safety hazards associated with 2,3-Dimethyl-1-butene?
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2,3-Dimethyl-1-butene is a highly flammable liquid and vapour (H225) and may be fatal if swallowed and enters airways (H304). It requires careful handling in well-ventilated areas, away from ignition sources, using appropriate personal protective equipment.
How is 2,3-Dimethyl-1-butene packed and shipped by TSS?
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2,3-Dimethyl-1-butene is shipped as UN 3295BF 3 / PGII, adhering to strict safety and regulatory standards for hazardous materials. TSS is a global supplier and exporter, ensuring compliant packaging for international shipments.
How can I request a sample or quote for 2,3-Dimethyl-1-butene?
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To request a sample or a quotation for 2,3-Dimethyl-1-butene, please contact the Tech Serve Solutions sales team through our website or by direct inquiry.
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