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Chemical Name: 2-Propen-1-Thiol
Other Names: Allyl mercaptan, Allylthiol
CAS Number: 107-18-6
Appearance: Colorless to pale yellow liquid
Odor: Intensely strong, unpleasant smell, similar to rotten eggs and garlic, often overwhelming
Molecular Formula: C3H6S
Typical Uses: Labs lean on it for organic synthesis, flavor synthesis, and sometimes research work connected to sulfur chemistry
GHS Classification: Flammable liquid, acute toxicity (oral, dermal, inhalation), skin and eye irritant
Hazard Statements: Liquid and vapors catch fire easily. Breathing or directly contacting causes headache, nausea, shortness of breath, or burns. Exposure sometimes irritates nose, throat, and eyes severely.
Routes of Exposure: Inhalation, skin absorption, ingestion, eye contact; any pathway leads to harmful effects due to the molecule’s reactivity and volatility
Acute Health Effects: Dizziness, respiratory distress, watering eyes, risk of chemical burns
Chronic Health Effects: Prolonged exposure may harm liver, kidneys, or lead to nervous system impacts, based on occupational safety reviews
Environmental Hazards: Toxic to aquatic organisms, potential long-term damage to water resources
Main Ingredient: 2-Propen-1-Thiol (Allyl mercaptan), typically >98% purity in lab or industrial sources
Impurities: May contain trace quantities of allyl sulfides or stabilizers depending on synthesis method
Inhalation: Move affected person to fresh air promptly. Support breathing with oxygen if symptoms appear. Immediate medical attention helps avoid lasting effects.
Skin Contact: Wash area with copious water and mild soap for at least 15 minutes. Remove contaminated clothing and avoid touching the face or eyes.
Eye Contact: Rinse gently and thoroughly under running water for at least 15 minutes, seek specialized medical care.
Ingestion: Do not induce vomiting. Rinse mouth out with water. Emergency responders should evaluate for any risks of aspiration or poisoning.
Symptoms to Watch For: Wheezing, skin blistering, persistent headache, loss of coordination
Suitable Extinguishing Media: Dry chemical, foam, or carbon dioxide extinguishers—water spray works for cooling, not direct fire suppression
Specific Dangers: Combustion rapidly releases flammable vapors and hydrogen sulfide alongside noxious smoke
Protective Actions: Wear self-contained breathing apparatus, use full chemical-resistant gear
Special Precautions: Containers may explode when heated—cool them with water spray at a distance to reduce risk to responders
Personal Protection: Use chemical splash goggles, gloves, breathing mask; everyone not involved in cleanup must evacuate
Spill Response: Ventilate the area, stop leak if risk-free, sweep or absorb liquid with inert materials like sand, and seal in suitable containers
Environmental Caution: Keep spill away from drains, groundwater, or open waterways—chemical taints water sources and is toxic to fish
Precautions for Safe Handling: Work only in well-ventilated fume hoods or approved chemical areas. Prevent skin and eye contact at all costs. Avoid open flames, static, and any heat source—vapors meet a spark and you’ll regret it.
Storage Requirements: Store tightly sealed, upright, in cool, dry, flame-proof cabinets rated for flammable chemicals. Never store near oxidizers or food items. Maintain clear, bold labeling for every container—confusion is costly.
Incompatibilities: Oxidizing agents, strong bases, strong acids, and many metals
Engineering Controls: Fume hoods, exhaust fans—with this much stink, ventilation proves itself immediately
Respiratory Protection: NIOSH-approved respirators—don’t gamble with your lungs if there’s even a whiff of uncertainty
Skin Protection: Nitrile or butyl rubber gloves, not just thin disposables
Eye Protection: Chemical safety goggles, ideally with side shields; splash risk is ever-present
Other Gear: Aprons, closed footwear, full sleeves—exposed skin finds out fast why protection matters
Workplace Practices: Wash hands before eating or drinking, take breaks far from your bench
Physical State: Low-viscosity liquid
Color: Pale yellow, though sometimes nearly clear
Boiling Point: About 93°C (199°F)
Melting Point: Near -116°C
Flash Point: Around 17°C (62.6°F)—starts burning dangerously low
Vapor Pressure: High; that nose-wrinkling stink drifts on even small leaks
Solubility: Only slightly soluble in water, but mixes well with organic solvents
Density: Approximately 0.86 g/cm³
Odor Threshold: Detectable at extremely low concentrations
Chemical Stability: Unstable around heat sources, air, light; reacts over time
Incompatible Materials: Avoid acids, alkalis, oxidizers—reaction may result in toxic gases or violent decomposition
Hazardous Reactions: May polymerize, release hydrogen sulfide or other toxic fumes
Conditions to Avoid: Heat, sparks, flame, sunlight, moisture exposure, uncontrolled pressure
Likely Routes of Exposure: Skin, eyes, respiratory, accidental ingestion
Acute Toxicity: Strong mucous membrane irritation, headaches, dizziness, risk of chemical pneumonia
Skin and Eye Irritation: Chemical blistering, redness, severe pain upon contact
Long-Term Effects: Research points to potential liver and kidney strain, as well as neural complications after repeated or prolonged exposure
Carcinogenicity: No clear data supporting direct cancer risk, but the molecule reacts with DNA in lab settings
Symptoms from Overexposure: Drowsiness, uncoordinated movement, persistent cough
Aquatic Toxicity: Lethal to aquatic life in low concentrations; thins out oxygen in water, trips up fish and other wildlife
Persistence and Degradability: Breaks down in air over time, yet some toxic byproducts linger
Potential for Bioaccumulation: Not much evidence of buildup in animal tissues, but what gets in the water does lasting harm
Soil Mobility: Rapidly volatilizes but sticks around in poorly ventilated low spots
Waste Handling: Treat all leftover material as hazardous waste. Use sealed, labeled containers for any collection or transfer.
Preferred Disposal Method: Send to licensed chemical incineration facilities. Pouring down the drain or trash is off the table, since water and land pollution risk runs high.
Regulatory Guidelines: Follow local hazardous waste procedures; improper disposal results in hefty fines and risk to community health. Never mix with other lab wastes or store for extended periods without a plan.
UN Number: 2332
Shipping Name: 2-Propen-1-Thiol, Flammable Liquid
Packing Group: II or III depending on concentration
Hazard Class: Flammable liquid, toxic
Transport Precautions: Keep far from food, feed, medical shipments; use robust containers, clear hazard placards; emergency spill plan required for bulk or high-frequency shipments
Workplace Exposure Limits: Consult national guidelines—2-Propen-1-Thiol rarely appears on published lists, but standard procedures for flammable, acutely toxic chemicals apply
Labeling Requirements: GHS pictograms: Flame, Skull and Crossbones, Exclamation Mark
Environmental Regulations: Strict local and national mandates for emissions, waterway release, and disposal
Reporting Obligations: Major leaks, workplace overexposures, or transportation incidents require immediate reporting to environmental health authorities.
