Overview
Chlorophenylboronic Acid is a boron-containing aromatic compound primarily employed as a building block in cross-coupling reactions. As a derivative of phenylboronic acid, its chlorine substituent enhances reactivity in palladium-catalyzed transformations. The compound gained prominence with the widespread adoption of Suzuki-Miyaura coupling in medicinal chemistry. Industrial production typically involves lithiation-chlorination of phenylboronic acid derivatives. Its stability and handling requirements make it suitable for controlled industrial environments rather than small-scale laboratory use. Major producers are located in China, India, and Western Europe, supplying GMP and technical grades.
Physical and Chemical Properties
This crystalline solid demonstrates moderate thermal stability, with decomposition occurring before melting at 210-215°C. Its boronic acid functional group (-B(OH)2) exhibits characteristic reactivity with diols and nucleophiles, forming cyclic boronate esters in protic solvents. The chlorine atom at the para position activates the benzene ring for electrophilic substitution while maintaining the compound's stability under standard storage conditions. Spectroscopic characterization typically includes 11B NMR (δ ~30 ppm) and IR absorption at 1340 cm−1 (B-O stretch). Moisture exposure leads to gradual hydrolysis, forming boroxines.
Main Applications
Approximately 70% of global production serves pharmaceutical synthesis, particularly for angiotensin receptor blockers and kinase inhibitors. The compound's ability to introduce chlorophenyl groups makes it valuable for creating bioactive molecules with improved metabolic stability. In agrochemicals, it functions as an intermediate for fungicides and herbicides. Emerging applications include organic electronics, where it contributes to the synthesis of charge-transport materials for OLED displays. Some specialty polymers incorporate chlorophenylboronic acid moieties for sensor applications.
Safety and Storage
As a boronic acid derivative, it requires handling with nitrile gloves and eye protection due to potential irritation. Although not classified as acutely toxic, prolonged exposure may cause respiratory sensitization in occupational settings. Proper storage involves double packaging with desiccants under nitrogen atmosphere. Industrial users should monitor container headspace moisture levels during long-term storage. Waste disposal must follow local regulations for organoboron compounds, typically involving neutralization before incineration.
B2B Procurement Guide
Bulk purchasers should request certificates of analysis confirming: 1) HPLC purity (industry standard ≥97%), 2) residual solvent levels (especially THF or methanol), and 3) heavy metal content (<10 ppm). Pharmaceutical-grade material requires additional ICH impurity profiling. Reliable suppliers provide stability data and recommended retest periods (typically 24 months when stored properly). Container sizes range from 1kg foil bags to 25kg fiber drums with polyethylene liners. Just-in-time delivery is preferable to minimize storage duration.
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