Overview
Bromothioanisole (C7H7BrS) is an organosulfur compound featuring a bromine-substituted thioanisole structure. It serves as a versatile intermediate in organic synthesis, particularly in pharmaceuticals and agrochemicals. The compound's reactive bromine site enables cross-coupling reactions, making it valuable for constructing complex molecules. First synthesized in the early 20th century, bromothioanisole gained industrial significance with the development of palladium-catalyzed coupling reactions. Its stability and moderate reactivity balance make it preferable to more volatile brominated compounds in many applications.
Physical and Chemical Properties
As a liquid at room temperature, bromothioanisole exhibits a density of approximately 1.42 g/cm³ and boils at 230-232°C. Its sulfur center confers nucleophilicity, while the bromine substituent allows electrophilic aromatic substitution and metal-catalyzed reactions. The compound's solubility profile favors organic solvents like ethanol, ether, and dichloromethane, with negligible water solubility. It demonstrates stability under inert atmospheres but degrades upon prolonged exposure to light or strong oxidizers. Spectroscopic characterization typically shows strong IR absorption at 690 cm⁻¹ (C-Br stretch) and 1080 cm⁻¹ (C-S stretch).
Main Applications
In pharmaceuticals, bromothioanisole acts as a precursor for antipsychotics and anti-inflammatory agents through Suzuki-Miyaura couplings. Agrochemical manufacturers utilize it to synthesize herbicidal compounds, leveraging its ability to introduce sulfur-containing moieties. The material science sector employs this compound in liquid crystal and polymer synthesis, where its aromatic structure enhances thermal stability. Recent research explores its use in organic semiconductors due to favorable electron transport properties when incorporated into π-conjugated systems.
Safety and Storage
Bromothioanisole requires careful handling as it may cause skin/eye irritation and respiratory discomfort. Laboratories and production facilities should maintain local exhaust ventilation and mandate nitrile gloves with chemical goggles. Storage recommendations include amber glass bottles or stainless steel containers under nitrogen blankets to prevent oxidation. Incompatible materials include strong acids, bases, and oxidizers like peroxides. Spills should be contained with inert absorbents (vermiculite) and disposed as hazardous waste under RCRA regulations.
B2B Procurement Guide
When sourcing bromothioanisole, prioritize suppliers providing batch-specific certificates of analysis (CoA) verifying purity (≥98% HPLC), residual solvent levels, and heavy metal content. Pharmaceutical-grade material typically commands a 20-30% price premium over technical grade. Logistics planning should account for UN proper shipping name 'Thioanisole, bromo derivatives' (UN 3334). Bulk purchases (100kg+) often reduce unit costs by 15-20%. Audit suppliers for GMP compliance if intended for drug synthesis, and confirm their capacity for custom bromination to adjust substitution patterns.
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