Overview
2-Hydroxythiophenol (o-mercaptophenol) is an organosulfur compound featuring both thiol (-SH) and phenolic (-OH) functional groups. It serves as a versatile building block in chemical synthesis due to its dual reactivity. First reported in the early 20th century, this compound has gained industrial significance in specialty chemical manufacturing. As a bifunctional molecule, it participates in reactions typical of both thiols (e.g., disulfide formation) and phenols (e.g., etherification). Its unique structure enables applications ranging from rubber vulcanization accelerators to pharmaceutical intermediates.
Physical and Chemical Properties
This aromatic thiol appears as a colorless to faint yellow liquid with a characteristic pungent odor. The compound's density (1.18 g/cm³) and boiling point (218-220°C) reflect its polar nature. The thiol group has a pKa of ~6.5, making it more acidic than typical alcohols. Key chemical behaviors include: 1) Oxidation to form disulfides, 2) Metal chelation via S/O donor atoms, and 3) Electrophilic aromatic substitution at the ortho/para positions. It shows limited water solubility but mixes well with most organic solvents. Spectroscopic properties include strong IR absorption at 2550 cm⁻¹ (S-H stretch) and UV-Vis λmax at 275 nm.
Main Applications
In rubber industry, 2-hydroxythiophenol derivatives act as secondary accelerators for vulcanization, improving crosslinking efficiency. Pharmaceutical manufacturers utilize it to synthesize benzothiazole scaffolds found in antimicrobial and anti-inflammatory drugs. The compound also serves as: 1) A ligand in transition metal catalysis, 2) A precursor for heterocyclic compounds in agrochemicals, and 3) A modifier in polymer chemistry. Emerging applications include its use in gold nanoparticle synthesis and as a chain transfer agent in controlled radical polymerization.
Safety and Storage
As a thiol compound, 2-hydroxythiophenol requires careful handling due to its corrosive nature and unpleasant odor. Skin contact may cause burns, while inhalation can irritate respiratory tracts. Always use chemical-resistant gloves (nitrile/neoprene) and splash goggles in handling. Store in amber glass or polyethylene containers under nitrogen atmosphere to prevent oxidation. Secondary containment is recommended for bulk storage. Spills should be neutralized with dilute sodium hypochlorite solution before cleanup with absorbent materials. Shelf life typically exceeds 2 years when stored properly at 15-25°C.
B2B Procurement Guide
Industrial buyers should verify: 1) Purity specifications (HPLC/GC analysis reports), 2) Residual solvent content, and 3) Peroxide levels for aged samples. Technical grade (≥95%) suffices for rubber applications, while pharmaceutical uses require ≥99% purity. Leading manufacturers are concentrated in China, India, and Western Europe. MOQs typically start at 100kg, with drum (200L) shipments being most cost-effective. Request SDS and compliance certificates (REACH, TSCA) for international trade. Consider pre-qualifying alternative suppliers due to occasional production bottlenecks.
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