Aminothiobenzaldehyde
Overview
Aminothiobenzoic acid is a specialty organic compound featuring both amino (-NH2) and thiol (-SH) functional groups attached to a benzene ring. This dual functionality makes it valuable as a building block in fine chemical synthesis. The compound is primarily manufactured for industrial rather than retail markets, with production concentrated in regions with strong pharmaceutical and agrochemical industries. As a niche chemical, it is typically supplied in kilogram quantities with purity grades ranging from 95% to 99%. The global market for aminothiobenzoic acid is driven by demand from drug development sectors, where it serves as a precursor for heterocyclic compounds and metal-chelating agents.
Physical and Chemical Properties
The compound presents as a crystalline solid with characteristic sulfurous odor at higher concentrations. Its dual functional groups contribute to amphoteric behavior - the amino group provides basicity while the thiol group exhibits weak acidity. This allows for diverse reaction pathways including nucleophilic substitution and metal coordination. Thermal stability is moderate, with decomposition observed above 180°C. Spectroscopic characterization typically shows strong IR absorption bands at 2550 cm−1 (S-H stretch) and 3400 cm−1 (N-H stretch). The thiol group makes the compound susceptible to oxidation, requiring inert atmosphere handling for sensitive applications.
Main Applications
In pharmaceutical synthesis, aminothiobenzoic acid serves as a key intermediate for benzothiazole derivatives, which form the core structure of several antimicrobial and anti-inflammatory drugs. The compound's ability to chelate metal ions also finds use in catalysts for asymmetric synthesis. Agrochemical manufacturers utilize it in the production of fungicides and plant growth regulators. Industrial applications include use as a corrosion inhibitor in specialized formulations and as a chain transfer agent in radical polymerization processes. Emerging research explores its potential in materials science for creating self-assembled monolayers (SAMs) on metal surfaces.
Safety and Storage
Standard laboratory precautions should be observed when handling aminothiobenzoic acid. The compound may cause skin sensitization upon repeated exposure and eye irritation upon contact. Appropriate PPE including nitrile gloves, safety goggles, and lab coats is recommended. Work should be conducted in well-ventilated areas or fume hoods. Long-term storage requires protection from oxidation and moisture. Ideal conditions involve amber glass containers under nitrogen atmosphere at refrigerated temperatures (2-8°C). Shelf life is typically 12-24 months when properly stored. Incompatibilities include strong oxidizers, heavy metal salts, and concentrated acids.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with demonstrated expertise in sulfur chemistry and proper analytical capabilities. Key purchasing considerations include batch-to-batch consistency, residual solvent levels, and heavy metal content. Technical specifications should detail HPLC purity, water content (Karl Fischer), and residue on ignition. For pharmaceutical applications, request DMF (Drug Master File) or CEP (Certificate of Suitability) documentation. Minimum order quantities typically range from 1-10 kg for pilot-scale purchases, with bulk discounts available for 50+ kg orders. Lead times vary from 2-8 weeks depending on supplier inventory and purification requirements.
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