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Name: 2-Cyclohexen-1-One
Chemical Formula: C6H8O
CAS Number: 930-68-7
Physical State: Colorless to pale yellow liquid under room conditions
Common Uses: Intermediate for pharmaceuticals, perfumes, flavor synthesis
Odor: Sweet, onion-like
GHS Classification: Flammable liquid, Irritant to skin and eyes, Possible aquatic pollutant
Hazard Statements: Flammable liquid and vapor; may cause moderate skin irritation; prolonged contact could trigger eye redness or pain; inhalation can cause dizziness or headache
Signal Word: Warning
Pictograms: Flame, exclamation mark, aquatic toxicity
Component: 2-Cyclohexen-1-One
Concentration: ≥ 98% by weight
Impurities: May contain trace organics from synthesis process, generally less than 1%
Inhalation: Move person to fresh air, support breathing, consult medical help if symptoms linger
Skin Contact: Wash thoroughly with soap and water; remove contaminated clothing
Eye Contact: Rinse carefully with plenty of clean water for several minutes; seek help if irritation persists
If Swallowed: Rinse mouth, avoid forced vomiting, get medical attention
Personal Experience: The quick, sharp, almost burning feeling if you accidentally splash 2-cyclohexen-1-one onto your hands sticks with you; immediate washing is key to stop redness or itching later
Suitable Extinguishing Media: Dry chemical, carbon dioxide, alcohol-resistant foam
Hazards from Combustion: Vapors may form explosive mixtures with air, releasing unpleasant smoke and hazardous gases
Protective Equipment: Full protective gear including breathing apparatus recommended for indoor fires
Advice for Firefighters: Stay upwind, avoid direct smoke exposure, keep run-off water contained
Personal Precautions: Ventilate area, avoid inhaling vapors, wear personal protection including gloves and safety glasses
Spill Handling: Absorb with inert material like sand or earth, scoop up for chemical waste disposal
Environmental Precautions: Prevent chemical from reaching drains or water sources to minimize local aquatic impact
Real Issue: Cleaning up a tipped bottle gets messy fast, and the vapors hang around; immediately isolating the space and tackling it with gloves makes all the difference
Handling: Work in fume hood or well-ventilated space, wear eye and skin protection, keep away from ignition sources
Storage: Keep sealed, cool, and away from sunlight in dedicated flammable storage cabinet
Incompatible Materials: Strong oxidizers or acids, which can trigger hazardous reactions
Practice: Storing this away from heat sources and clearly labeled stops both lab confusion and surprise chemical reactions
Ventilation: Use exhaust ventilation or fume hood to limit exposure
Personal Protective Equipment: Chemical-resistant gloves (nitrile is common choice), splash goggles, lab coat
Occupational Exposure Limits: No established OSHA or ACGIH limits, but minimizing vapor concentration helps reduce risk
Personal Note: Putting on gloves and goggles has become routine after enough accidents with solvents; it pays off by keeping burns or rashes at bay
Appearance: Mostly clear to faint yellow liquid
Odor Threshold: Low — strong smell even at low concentrations
Boiling Point: Nearly 156°C
Melting Point: Around -42°C
Flash Point: Roughly 46°C (closed cup)
Solubility: Slight in water, easily soluble in organic solvents like ethanol or ether
Density: About 0.95 g/cm³ at 25°C
Vapor Pressure: Significant, so vapors can build quickly in closed spaces
Chemical Stability: Stable under standard temperature and dry conditions, but decomposition possible with heat or light
Reactive With: Strong oxidizers, acids, alkali metals
Polymerization: Unlikely, though not impossible with the right mix of contaminants
Insight: Keeping bottles capped, out of direct sunlight, makes this compound much less fussy to deal with over time
Acute Effects: Can irritate skin, eyes, respiratory tract; may cause headache, nausea, or drowsiness if inhaled
Routes of Exposure: Mainly inhalation, skin or eye absorption, accidental ingestion
Chronic Effects: Not fully studied, though frequent contact can sensitize skin
Personal Experience: A brief fume inhalation leaves an immediate headache or nose tingle; working under a hood with this compound keeps minor symptoms from becoming more serious
Aquatic Toxicity: Harmful to aquatic organisms if released in significant volume
Mobility: Spreads through soil or water if not contained
Persistence: Can degrade under photochemical conditions after time
Solution: Preventing lab runoff remains the smartest step, both for compliance and local ecosystems
Disposal Method: Incinerate at approved facility or dispose as hazardous organic waste, following local regulations
Do Not: Pour down regular drains or in municipal trash; mixed solvents like this need specialized handling
Experience: Coordinating drop-off days for organic solvent waste helps labs avoid years of chemical backlogs or regulatory fines
UN Number: 1993 (Flammable liquids, n.o.s.)
Class: Flammable Liquids (Class 3, ADR/RID/IMDG)
Packing Group: III
Precautions: Use approved containers with appropriate hazard labels, keep away from heat, avoid jostling in transit
Global Status: Listed in REACH, TSCA chemical inventories for laboratory and industrial use
Workplace Rules: Flammable cabinet storage, chemical hygiene plan, regular exposure training recommended
Personal Take: Revisiting regulatory updates each year keeps teams aware of evolving standards, especially for flammable and irritant chemicals like this one
