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Chemical Name: 1,3,5-Cycloheptatriene
Synonyms: Cyclohepta-1,3,5-triene
Chemical Formula: C7H8
Molecular Weight: 92.14 g/mol
Appearance: Colorless to pale yellow liquid, distinctive odor
Use Cases: Lab reagent, sometimes a starting material in organic synthesis
Classification: Flammable liquid, dangerous if inhaled in high concentrations
GHS Signal Word: Warning
Key Hazards: Irritates eyes and respiratory tract, poses fire risk, considered harmful if swallowed
Pictograms: Flame, exclamation mark
Acute Effects: Headache, dizziness, potential nausea
Chronic Effects: Possible organ damage from repeated exposure, toxicity not fully mapped due to research gaps
Chemical: 1,3,5-Cycloheptatriene
Concentration: Typically supplied in pure form for research applications
CAS Number: 544-25-2
Impurities: Commercially supplied samples often include very minor fractions of related hydrocarbons or polymerized material, analytically insignificant for most uses
Nature of Blend: Present as a single organic compound, rarely mixed with stabilizers
Inhalation: Remove to fresh air, loosen clothing, seek medical assistance if symptoms persist
Skin Contact: Wash thoroughly with soap and water, remove contaminated clothing
Eye Contact: Rinse cautiously with clean water, avoid rubbing, consult a medical professional if irritation continues
Ingestion: Rinse mouth, avoid inducing vomiting, head to medical care for advice
Observations: Symptoms can be subtle, vigilance often reduces risk of complications
Suitable Extinguishing Media: Dry chemical, foam, CO2; avoid water jets due to possible spread
Special Hazards: Vapors form explosive mixtures with air, dense smoke possible, hazardous decomposition products may arise
Firefighter Protection: Full turnout gear, self-contained breathing apparatus recommended
Other Notes: Keep containers cool with a gentle spray of water to prevent pressure buildup; coordinate with site-specific protocols for organic solvent fires
Personal Protection: Avoid breathing vapors, ventilate area, wear nitrile gloves and safety goggles
Environmental Precautions: Keep out of drains, use absorbent materials like sand or vermiculite
Spill Cleanup: Collect using non-sparking tools, transfer to disposal containers designed for flammables
Decontamination: Wash area with soap and water after removal of gross contamination, monitor for vapor resurgence
Handling: Use only in fume hoods or areas with strong ventilation, no open flames or ignition sources, keep container tightly closed
Storage: Store in cool, dry, well-ventilated location away from heat, direct sunlight, and strong oxidizers
Incompatibilities: Avoid strong acids, bases, and oxidizing agents; incompatibility accidents sometimes stem from overlooked bench residues
Recommended Containers: Amber glass, well-sealed, labeled against unauthorized use
Engineering Controls: Fume hoods, explosion-proof ventilation, routine monitoring for leaks or vapor buildup
Personal Protective Equipment: Chemical splash goggles, nitrile gloves, lab coats; sometimes face shields
Respiratory Protection: Respirators only if ambient concentrations approach unsafe levels or spills occur
Hygiene: No eating, drinking, or smoking in storage or handling areas
State: Liquid
Color: Colorless to pale yellow
Odor: Aromatic, persistent
Boiling Point: About 115°C
Melting Point: Roughly −38°C
Flash Point: Around 7°C (closed cup)
Density: 0.885 g/cm³
Solubility: Not soluble in water, mixes well with many organic solvents
Vapor Pressure: Noticeably high at room temperature, contributing to rapid evaporation
Chemical Stability: Stable under recommended handling and storage, decomposes under strong light or heat
Reactivity: May react violently with strong oxidizers, can polymerize unpredictably if heated or contaminated
Hazardous Decomposition Products: Toxic or irritating fumes, likely including carbon monoxide and various organic residues
Precautionary Insight: Best practice emphasizes refrigeration and light shielding for storage
Routes of Exposure: Inhalation, dermal, ocular, oral
Acute Toxicity: Exact LD50 data often missing, exposure linked to dizziness, drowsiness, minor irritation of eyes or mucous membranes
Sensitization Potential: No strong evidence for skin or respiratory sensitization in typical lab settings
Chronic Effects: No definitive links to carcinogenicity or reproductive harm; regulatory reference notes potential central nervous system effects with regular exposure
Users' Experience: Anecdotal reports of headaches and mild confusion stress importance of controls
Aquatic Toxicity: Likely harmful to aquatic life with lasting effects, especially in confined bodies of water
Persistence and Degradability: Biodegradation data slim, aromatic rings in structure suggest relative persistence
Bioaccumulation: Potential for bioaccumulation remains poorly studied
Environmental Release: Waste treatment plants typically unable to degrade effectively; accidental discharge can threaten biota
Waste Disposal Methods: Incinerate at approved chemical waste facility, avoid landfill unless no practical alternative exists
Container Disposal: Triple rinse containers, puncture to prevent reuse, treat as hazardous waste
Regulations: Veterinary, laboratory, and industrial users need to check regional rules, often classified among hazardous organics
UN Number: 1993 for flammable liquids (generic)
Hazard Class: Flammable Liquids, Packing Group II or III depending on flash point and volume
Transport Modes: By road, rail, or air with strict limits, labeled in compliance with international transport rules
Handling During Transit: Tightly sealed, protected from temperature extremes, isolated from oxidizers and ignition sources
Global Inventory Status: Appears on most national chemical inventories
OSHA: Covered as hazardous under US Hazard Communication Standard
EU Classification: Listed as flammable, potential long-term hazards still monitored
Other Standards: Subject to workplace exposure monitoring, management of hazardous air pollutants
Point for Workers: Training and ready access to safety documentation count as regulatory musts for every handling scenario
