Product Overview

2-Bromonaphthalene is an aryl bromide with the molecular formula C₁₀H₇Br and molecular weight of 207.07 g/mol. This white to light yellow crystalline solid serves as a versatile building block in organic synthesis, particularly in cross-coupling reactions for the preparation of substituted naphthalene derivatives. The compound is widely used in pharmaceutical, agrochemical, and materials science research.

Synthetic Process

2-Bromonaphthalene is synthesized via the bromination of naphthalene under controlled conditions:

• Bromination: Naphthalene is brominated using elemental bromine in an inert solvent such as carbon tetrachloride or chloroform, typically with iron or aluminum bromide as a catalyst, to yield a mixture of 1-bromonaphthalene and 2-bromonaphthalene

• Isomer Separation: The bromination mixture is separated by fractional distillation or selective crystallization to isolate the 2-bromo isomer (the thermodynamically more stable product at higher temperatures)

• Purification: The isolated product is purified by recrystallization from ethanol or other suitable solvents

• Drying: The purified product is dried under vacuum to yield the final crystalline compound

Mechanism of Action

As an aryl bromide, 2-bromonaphthalene participates in various reactions:

• Cross-Coupling Reactions: Efficient substrate for Suzuki-Miyaura, Heck, and Sonogashira coupling reactions to form biaryl and arylated alkene products

• Metal-Halogen Exchange: Reacts with organolithium reagents to generate the corresponding naphthyllithium species for further functionalization

• Nucleophilic Aromatic Substitution: Undergoes substitution reactions under appropriate conditions

• Electrophilic Aromatic Substitution: The bromine directs further electrophilic substitution to specific positions on the naphthalene ring

Research Applications & Market Significance

2-Bromonaphthalene has diverse research and industrial applications:

• Pharmaceutical Research: Building block for the synthesis of various drug candidates including anti-inflammatory, anticancer, and antiviral agents

• Agrochemical Synthesis: Intermediate for the preparation of insecticides, herbicides, and fungicides

• Materials Science: Precursor for naphthalene-based liquid crystals, organic light-emitting diodes (OLEDs), and conducting polymers

• Organic Synthesis: Versatile intermediate for the preparation of functionalized naphthalene derivatives

• Catalysis Research: Substrate for testing and developing new cross-coupling catalysts

Quality Specifications

• Purity: ≥98.0% determined by GC

• Melting point: 54-57°C

• Boiling point: 281-282°C

• Loss on drying: ≤0.5%

• Residue on ignition: ≤0.1%

• Each batch accompanied by a comprehensive Certificate of Analysis (COA)

• Stable for 36 months when stored in sealed containers at 2-8°C protected from light

Packaging & Shipping

• Research quantities: 10g, 25g, 100g amber glass vials

• Bulk quantities: 500g amber glass bottles

• Custom packaging available upon request

• Shipped at ambient temperature

• International shipping available with proper documentation