1-Chloro-3-methyl-2-butene
1-Chloro-3-methyl-2-butene (CAS 503-60-6) is a halogenated hydrocarbon with the molecular formula (CH₃)₂C=CHCH₂Cl and a molecular weight of 104.58 g/mol. This alkenyl compound serves as a versatile building block in organic synthesis. It is primarily utilised in chemical synthesis and research applications, offering a reactive site for various chemical transformations.

Organic Synthesis Intermediate
1-Chloro-3-methyl-2-butene is a valuable intermediate in the synthesis of more complex organic molecules. Its structure, featuring both an alkene and an alkyl halide functionality, allows for diverse reaction pathways.
Research and Development
This compound is employed in research laboratories for the development of new chemical entities and reaction methodologies. Its utility as a building block supports advancements in various chemical fields.
Fine Chemical Production
It functions as a precursor or reagent in the production of fine chemicals, contributing to the supply chain for specialised chemical products.
| Molecular weight | 104.58 |
|---|---|
| Linear formula | (CH3)2C=CHCH2Cl |
| Assay | 95% |
| Boiling point | 58-59 °C/120 mmHg(lit.) |
| Density | 0.928 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.4488(lit.) |
| Storage temperature | 2-8°C |


Hazard statements
- H225Highly flammable liquid and vapour
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P210Keep away from heat, sparks and open flames. No smoking
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 13 °C / 55.4 °F |
| Transport (UN / ADR) | UN 1993BF 3 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | F,Xi |
| Risk statements (R) | 11-36/37/38 |
| Safety statements (S) | 16-26-27-36/37/39 |
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 1-Chloro-3-methyl-2-butene used for?
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1-Chloro-3-methyl-2-butene is primarily used as a building block in organic synthesis and in research and development for creating new chemical entities. It also finds application in the production of fine chemicals.
What is the CAS number and chemical formula for 1-Chloro-3-methyl-2-butene?
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The CAS number for 1-Chloro-3-methyl-2-butene is 503-60-6, and its linear chemical formula is (CH₃)₂C=CHCH₂Cl.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 1-Chloro-3-methyl-2-butene with an assay of 95%. We do not represent this product as meeting USP, BP, or EP pharmacopoeia standards.
How should 1-Chloro-3-methyl-2-butene be handled safely?
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1-Chloro-3-methyl-2-butene is highly flammable and can cause skin, eye, and respiratory irritation. Handle with appropriate personal protective equipment, including safety goggles, gloves, and a suitable respirator, in a well-ventilated area, away from ignition sources.
How is 1-Chloro-3-methyl-2-butene packed and shipped?
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Tech Serve Solutions expertly packs and ships chemicals globally, adhering to all relevant transport regulations. Specific packaging details are available upon request, tailored to ensure safe and compliant delivery.
How can I request a quote or sample of 1-Chloro-3-methyl-2-butene?
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To request a quote or a sample of 1-Chloro-3-methyl-2-butene, please contact our sales team through the website or by phone. Our specialists will assist you promptly.
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