Description

4-Chloro-3-Methyl-1-Butene is a versatile chlorinated olefin building block of significant importance in fine chemical synthesis. Its reactive allylic chloride and alkene functionalities make it a valuable intermediate for constructing more complex molecular architectures. This compound is primarily utilized by research and development chemists and process engineers in the pharmaceutical and agrochemical industries for the synthesis of active ingredients and specialty chemicals.

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of active pharmaceutical ingredients (APIs), particularly those requiring a functionalized butene skeleton.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and insecticides where the chloromethyl group introduces reactivity for further derivatization.
• Organic Synthesis Reagent: Serves as an alkylating agent and a precursor for Grignard reactions or cross-coupling reactions in research laboratories.
• Polymer Modification: Can be used as a comonomer or chain-transfer agent to introduce chlorine functionality or side chains into polymer backbones.
• Flavor and Fragrance Industry: Intermediate for the synthesis of certain terpene-based aroma chemicals.
• Material Science: Precursor for surface modifiers or adhesion promoters in specialty coatings and composites.

Basic Information

Item	Detail
Product Name	4-Chloro-3-Methyl-1-Butene
CAS No.	10524-01-3
Molecular Formula	C5H9Cl
Molecular Weight	104.58 g/mol
Synonyms	3-Methyl-4-chloro-1-butene; 1-Butene, 4-chloro-3-methyl-; 4-Chloro-3-methylbut-1-ene; γ-Chloro-β-methylallyl chloride; (3-Methyl-3-butenyl) chloride; 1-Chloro-3-methyl-3-butene; 4-Chloro-3-methylbutene-1
EINECS	234-073-5

Quality Control

Our 4-Chloro-3-Methyl-1-Butene is manufactured under strict quality management systems. Every batch undergoes comprehensive analytical testing including GC, NMR, and titration to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing all specifications are provided and we support compliance with REACH and other global regulatory frameworks.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and incompatible materials such as strong bases and oxidizing agents. Due to its highly volatile nature, keep containers tightly sealed when not in use. Recommended storage temperature: 2-8°C for long-term stability.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Water Content (KF)	≤ 0.5%
Density (20°C)	0.92 - 0.96 g/mL
Refractive Index (n20D)	1.435 - 1.445

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.