Description

4-Bromo-1-Butene is a versatile halogenated alkene building block, essential for introducing the butenyl moiety into complex molecular frameworks. Its high reactivity, particularly in cross-coupling and alkylation reactions, makes it a critical intermediate for the synthesis of fine chemicals and advanced materials. This compound is primarily sought by R&D chemists and process engineers in the pharmaceutical, agrochemical, and specialty polymer industries for constructing key carbon chains.

Application

• Pharmaceutical Intermediate: Key building block for the synthesis of active pharmaceutical ingredients (APIs) and other bioactive molecules via nucleophilic substitution or metal-catalyzed coupling reactions.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and plant growth regulators that require a functionalized butene side chain.
• Material Science & Polymer Chemistry: Serves as a monomer or co-monomer precursor for specialty polymers and as a modifying agent for surface functionalization.
• Organic Synthesis & Research: A valuable reagent in laboratories for C4-alkylation, Grignard reactions, and as a precursor to other functionalized butenes like butenols and butenals.
• Liquid Crystal & Electronic Chemical Production: Employed in the synthesis of organic components for display materials and other electronic applications.
• Flavor & Fragrance Industry: Intermediate for the synthesis of certain aroma chemicals and flavoring agents.

Basic Information

Product Name	4-Bromo-1-Butene
CAS No.	5162-44-7
Molecular Formula	C4H7Br
Molecular Weight	135.00 g/mol
Synonyms	1-Butene, 4-bromo-; 4-Bromobut-1-ene; But-3-enyl bromide; 3-Butenyl bromide; 4-Bromobutene; γ-Bromoallylene; Bromobutene; UN 1993 (if applicable for transport)
EINECS	225-934-8

Quality Control

Our 4-Bromo-1-Butene is manufactured under strict quality management systems. Every batch undergoes comprehensive analytical testing including GC, NMR, and titration to ensure high purity and consistency. A detailed Certificate of Analysis (COA) is provided with each shipment, confirming compliance with agreed specifications. We support cGMP and ISO 9001 standards for industrial and research applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated place away from heat sources and incompatible materials. Due to its highly volatile and light-sensitive nature, it is recommended to store under an inert atmosphere (e.g., nitrogen) for long-term stability. Keep container tightly sealed when not in use to prevent evaporation and moisture ingress.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Density (at 20°C)	1.30 - 1.34 g/mL
Refractive Index (n20/D)	1.465 - 1.475
Water Content (KF)	≤ 0.5%

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