Benzenethiol

Benzenethiol is an organosulfur compound with the molecular formula C6H6S and CAS number 108-98-5. It consists of a benzene ring with a thiol (-SH) functional group attached, making it the simplest aromatic thiol. With a molecular weight of 110.18 g/mol, benzenethiol is characterized by its strong, unpleasant odor typical of sulfur compounds and serves as an important intermediate in organic synthesis and industrial applications.

Benzenethiol is a colorless to pale yellow liquid at room temperature with a characteristic strong, penetrating odor reminiscent of garlic or sulfur. It has limited solubility in water due to its aromatic nature but is miscible with organic solvents such as ethanol, ether, and benzene. The compound has a boiling point around 169°C and exhibits typical thiol reactivity, including susceptibility to oxidation and metal coordination.

Benzenethiol serves as a valuable intermediate in organic synthesis, particularly in the production of pharmaceuticals, agrochemicals, and specialty chemicals. It is used in the manufacture of antioxidants, rubber accelerators, and metal flotation agents. The compound also finds applications in polymer chemistry as a chain transfer agent and in the synthesis of various organosulfur compounds. Additionally, it serves as a precursor for preparing other aromatic thiols and sulfur-containing heterocycles.

Benzenethiol requires careful handling due to its strong odor and potential toxicity. Operators must wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and respiratory protection in well-ventilated areas. Work should be conducted in fume hoods to prevent inhalation exposure. Avoid contact with skin, eyes, and clothing. Keep away from heat sources, sparks, and oxidizing agents. Ensure emergency eyewash stations and safety showers are readily accessible in work areas.

Benzenethiol must be stored in tightly sealed containers in a cool, dry, well-ventilated area away from heat, sparks, and direct sunlight. Keep separate from oxidizing agents, acids, and bases to prevent unwanted reactions. Storage areas should be equipped with appropriate spill containment measures and maintained at temperatures below 25°C. Use inert atmosphere storage when possible to prevent oxidation. Containers should be made of compatible materials such as stainless steel or specially treated glass.

Immediate action is required upon contact with benzenethiol. For skin contact, remove contaminated clothing and wash affected area thoroughly with soap and water for at least 15 minutes. In case of eye contact, flush immediately with clean water for 15-20 minutes and seek medical attention. If inhaled, move the person to fresh air immediately and seek medical help if breathing difficulties occur. For ingestion, do not induce vomiting and seek immediate medical attention.

Benzenethiol disposal must comply with local and national hazardous waste regulations due to its classification as toxic material. The compound should be collected in appropriate containers and disposed of through licensed hazardous waste treatment facilities. Small quantities may be treated through controlled incineration at high temperatures with adequate scrubbing systems. Never dispose of benzenethiol down drains or in regular waste streams. Consult with waste management specialists for proper disposal protocols and documentation requirements.

Benzenethiol is classified under ADR Class 6.1 (Toxic substances), Packing Group I, indicating high toxicity and requiring strict transport protocols. Shipments must use UN-approved packaging and proper hazard labeling including toxic substance markings. Transport vehicles require appropriate safety equipment and emergency response information. Drivers must hold valid dangerous goods transport certification. Shipping documentation must include proper shipping names, UN numbers, and emergency contact information for regulatory compliance.

Benzenethiol is subject to various chemical regulations including REACH registration requirements in Europe for commercial use. While not classified as an SVHC (Substance of Very High Concern), it falls under standard CLP classification and labeling regulations. Users must comply with occupational exposure limits and workplace safety requirements. Import/export may require specific permits depending on quantities and end-use applications. Always verify current regulatory status with competent authorities before commercial activities.

Benzenethiol is available through OYSI, a specialized European distributor of technical chemicals serving industrial and research customers across Europe. OYSI provides reliable supply chains for organosulfur compounds including benzenethiol with appropriate documentation and regulatory compliance support. For procurement inquiries, technical specifications, and delivery arrangements, contact OYSI directly through their European distribution network. They ensure proper handling, packaging, and transport of hazardous chemicals according to ADR and other applicable regulations.