Phenylboronic acid
Overview
Phenylboronic acid is a versatile organoboron compound commonly used in organic synthesis and pharmaceutical applications. It serves as a key reagent in Suzuki-Miyaura coupling reactions, a widely adopted method for forming carbon-carbon bonds. The compound's stability and reactivity make it a valuable intermediate in the production of fine chemicals and active pharmaceutical ingredients (APIs). First synthesized in the early 20th century, phenylboronic acid has gained prominence due to its role in cross-coupling reactions, which are fundamental in modern organic chemistry. Its relatively low toxicity and ease of handling further contribute to its widespread use in both academic and industrial settings.
Physical and Chemical Properties
Phenylboronic acid appears as a white to off-white crystalline powder with a molecular weight of 121.93 g/mol. It has a melting point range of 216-219 °C and a density of 1.08 g/cm³. The compound is soluble in water, methanol, ethanol, and ether, making it adaptable to various solvent systems in synthetic applications. One of its notable chemical properties is its sensitivity to moisture and air, which can lead to decomposition or reduced reactivity. Proper storage and handling are essential to maintain its stability. The boronic acid functional group (-B(OH)2) is highly reactive toward nucleophiles, enabling its use in diverse chemical transformations.
Main Applications
The primary application of phenylboronic acid is in Suzuki-Miyaura coupling reactions, where it acts as a key reagent to form biaryl compounds. These reactions are pivotal in the synthesis of pharmaceuticals, agrochemicals, and advanced materials. The compound's ability to facilitate carbon-carbon bond formation under mild conditions has made it indispensable in modern organic chemistry. Beyond coupling reactions, phenylboronic acid is used in the preparation of boron-containing polymers, sensors, and catalysts. Its derivatives are also explored in medicinal chemistry for their potential as enzyme inhibitors and therapeutic agents. The versatility of phenylboronic acid ensures its continued relevance in both research and industrial applications.
Safety and Storage
Phenylboronic acid is generally considered low in toxicity but can cause skin and eye irritation upon direct contact. Proper personal protective equipment (PPE), including gloves and goggles, should be worn when handling the compound. Work should be conducted in a well-ventilated area or under a fume hood to minimize inhalation risks. Storage conditions are critical to maintaining the compound's stability. It should be kept in a cool, dry place, preferably in an airtight container with desiccants to prevent moisture absorption. Exposure to oxidizing agents should be avoided, as it may lead to hazardous reactions. Always refer to the material safety data sheet (MSDS) for detailed handling and disposal guidelines.
B2B Procurement Guide
When procuring phenylboronic acid in bulk, B2B buyers should prioritize suppliers who provide a Certificate of Analysis (COA) to verify purity and quality. The compound is typically available in various grades, with pharmaceutical-grade being the highest purity. Buyers should specify their required purity level and packaging preferences, such as moisture-proof bags or sealed drums. Price negotiations often depend on order volume, with larger quantities commanding lower per-unit costs. Lead times can vary, so it's advisable to plan purchases in advance, especially for time-sensitive projects. Establishing long-term relationships with reputable suppliers can ensure consistent quality and reliable delivery schedules.
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