Overview
Bromocyclopropane is a halogenated hydrocarbon featuring a three-membered cyclopropane ring with a bromine substituent. This simple yet reactive structure makes it valuable for introducing the cyclopropyl group into more complex molecules. The compound's strain energy and polar C-Br bond contribute to its synthetic utility. First synthesized in the early 20th century, bromocyclopropane has become an important reagent in modern organic chemistry. Its production typically involves the addition of bromine to cyclopropene or through ring-closing reactions of 1,3-dibromopropane derivatives.
Physical and Chemical Properties
As a low molecular weight liquid (MW 120.98), bromocyclopropane exhibits characteristic physical properties including a density of 1.493 g/cm³ and boiling point of 69-70°C. The strained cyclopropane ring (bond angles ~60°) creates significant ring tension that influences its reactivity. The compound's chemical behavior is dominated by two key features: the weak C-Br bond (bond energy ~276 kJ/mol) that facilitates nucleophilic substitution, and the strained ring system that undergoes interesting rearrangement reactions. These properties make it particularly useful for cyclopropylation reactions under both SN2 and radical mechanisms.
Main Applications
In pharmaceutical synthesis, bromocyclopropane serves as a precursor for cyclopropyl-containing drugs, including certain antidepressants, antiviral agents, and antibiotic compounds. The cyclopropyl moiety often enhances metabolic stability and bioavailability in drug molecules. The agrochemical industry utilizes this compound in producing crop protection agents, particularly those targeting fungal pathogens. Recent research also explores its use in material science, such as in the synthesis of cyclopropane-containing polymers with unique mechanical properties.
Safety and Storage
Bromocyclopropane presents multiple hazards requiring strict safety protocols. As a flammable liquid (flash point -7°C), it must be stored away from heat and ignition sources in approved safety containers. The compound decomposes under fire conditions, releasing toxic hydrogen bromide gas. Proper personal protective equipment (PPE) including chemical-resistant gloves, goggles, and respiratory protection should be used when handling. Storage recommendations include temperature-controlled environments (15-25°C) with inert atmosphere options for sensitive applications. Secondary containment is advised to prevent environmental release.
B2B Procurement Guide
When sourcing bromocyclopropane, buyers should prioritize suppliers with certified quality control systems and batch-specific Certificates of Analysis. Technical grade (95-97% purity) suffices for many industrial applications, while pharmaceutical applications may require higher purity (≥99%). Key procurement considerations include packaging options (typically 1kg, 5kg, or 25kg metal/glass containers), minimum order quantities, and regional regulatory compliance documentation. Lead times for specialty orders can range from 2-6 weeks. Some suppliers offer custom synthesis services for modified cyclopropane derivatives.
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