Overview
2-Thiolactic acid is a bifunctional compound containing both carboxylic acid and thiol groups, making it valuable for diverse chemical syntheses. First reported in the early 20th century, its industrial production typically involves the reaction of lactic acid derivatives with sulfurizing agents. The compound's molecular structure allows it to participate in both nucleophilic thiol-ene reactions and typical carboxylic acid chemistry. This dual reactivity has led to its adoption in pharmaceutical manufacturing, where it serves as a building block for cysteine analogs and other sulfur-containing drugs.
Physical and Chemical Properties
As a liquid at room temperature, 2-thiolactic acid displays characteristic thiol properties including a strong, unpleasant odor similar to garlic or rotten eggs. Its density of 1.22 g/cm³ makes it heavier than water, though it forms homogeneous solutions in polar solvents. The thiol group (pKa ~10.4) is more acidic than the carboxylic acid group (pKa ~4.5), allowing selective deprotonation. Under oxidative conditions, the compound readily forms disulfide bridges, which must be considered during storage and handling. Its flash point of 93°C classifies it as combustible rather than flammable.
Main Applications
In pharmaceuticals, 2-thiolactic acid is a precursor for ACE inhibitors and radiocontrast agents. The thiol group's metal-chelating ability makes it useful in producing contrast media for MRI and X-ray imaging. The food industry employs it as a flavor precursor, particularly in meat flavorings where sulfur compounds contribute to savory notes. Polymer chemists utilize it as a chain transfer agent in radical polymerizations and for introducing thiol functional groups into resins and adhesives.
Safety and Storage
Proper handling requires chemical-resistant gloves (nitrile or neoprene), goggles, and vapor protection due to the compound's corrosive nature and volatile thiol emissions. Spills should be neutralized with sodium bicarbonate before cleanup. For long-term storage, amber glass bottles with PTFE-lined caps under nitrogen atmosphere are recommended to prevent oxidation. The material is incompatible with strong oxidizers, heavy metal salts, and alkaline substances. Commercial grades often contain stabilizers like BHT (0.1-1%) to inhibit disulfide formation.
B2B Procurement Guide
Industrial buyers should specify required purity (typically 98-99%), packaging size (1kg to 200kg drums), and whether stabilized grades are needed. Technical and analytical specifications should include residual solvent limits and heavy metal content. Leading manufacturers are concentrated in China, Germany, and India. Minimum order quantities often apply for bulk purchases, with price breaks at the 100kg level. Sample requests should include intended use to ensure appropriate grade selection. Always verify the supplier's ISO certification and batch-to-batch consistency.
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