Overview
Hydroxybenzotriazole (HOBt) is a versatile reagent in organic chemistry, particularly valued for its role in peptide coupling reactions. It minimizes racemization and enhances yield in amide bond formation, making it indispensable in pharmaceutical and biochemical research. Developed as an alternative to traditional coupling agents, HOBt is now a staple in solid-phase peptide synthesis (SPPS). Its stability under standard laboratory conditions and compatibility with common solvents contribute to its widespread adoption. HOBt is commercially available in various purity grades, with ≥98% purity being the industry standard for critical applications.
Physical and Chemical Properties
HOBt is a white crystalline solid with a melting point of 156–159°C. It exhibits moderate solubility in polar organic solvents like dimethylformamide (DMF) and dimethyl sulfoxide (DMSO), but limited solubility in water. The compound is non-hygroscopic, ensuring stability during storage and handling. Chemically, HOBt functions as a nucleophilic catalyst, facilitating the activation of carboxylic acids during peptide coupling. Its molecular structure includes a benzotriazole ring with a hydroxyl group, which is critical for its reactivity. HOBt is stable at room temperature but may decompose under strong acidic or alkaline conditions.
Main Applications
HOBt is primarily used in peptide synthesis, where it prevents epimerization and improves coupling efficiency. It is a key component in SPPS and solution-phase peptide synthesis, often paired with reagents like DCC (dicyclohexylcarbodiimide). Beyond peptides, HOBt finds use in pharmaceutical intermediates and specialty chemical production. Its ability to mediate esterification and amidation reactions makes it valuable for synthesizing complex organic molecules. Some industrial processes also employ HOBt as a stabilizing agent or catalyst.
Safety and Storage
HOBt is generally low-risk but requires careful handling due to potential skin and eye irritation. Use gloves, goggles, and lab coats when working with the compound. Avoid inhalation of dust and ensure adequate ventilation. Store HOBt in a tightly sealed container away from moisture and oxidizing agents. Long-term storage should be in a cool, dry environment (15–25°C). Dispose of waste according to local regulations, as HOBt may pose environmental hazards if released untreated.
B2B Procurement Guide
When procuring HOBt, prioritize suppliers with ISO or GMP certifications to ensure quality. Key specifications include purity (≥98%), low heavy metal content, and consistent particle size. Bulk buyers should negotiate prices for orders exceeding 25 kg, with discounts often available. Request material safety data sheets (MSDS) and certificates of analysis (CoA) to verify compliance. Consider suppliers offering customized packaging (e.g., vacuum-sealed bags) to extend shelf life. For international shipments, confirm adherence to transportation regulations for hazardous materials.
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