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Chemical Name: 4-Phenyl-1-Butene
Synonyms: 1-Butene, 4-phenyl-; But-1-ene, 4-phenyl-; 4-Phenylbut-1-ene
Chemical Formula: C10H12
Molecular Weight: 132.21 g/mol
Physical Appearance: Colorless to pale yellow liquid
Common Uses: Intermediate in organic synthesis, used in the production of specialty chemicals and pharmaceuticals
Odor: Aromatic, sweetish
GHS Classification: Flammable liquid (Category 3), Skin irritant (Category 2), Eye irritant (Category 2A)
Hazard Statements: Flammable liquid and vapor. Causes skin and eye irritation. May cause respiratory tract irritation upon inhalation.
Route of Exposure: Eye contact, skin contact, inhalation, ingestion
Precautionary Statements: Keep away from ignition sources. Avoid breathing vapors. Wear protective gloves, clothing, and eye protection.
Signal Word: Warning
Chemical Identity: 4-Phenyl-1-Butene
CAS Number: 104-67-6
Concentration: Typically over 98% purity in commercial samples
Impurities: Trace amounts of butenes, styrenes, and related aromatic or olefinic compounds may be present in technical-grade material
Inhalation: Move person to fresh air immediately. Loosen tight clothing. Seek medical attention if breathing difficulty develops.
Skin Contact: Wash skin with plenty of soap and water. Remove contaminated clothing. If skin irritation persists, get medical advice.
Eye Contact: Rinse cautiously with clean water for at least 15 minutes. Remove contact lenses if present and easy to do. Consult medical help for persistent pain or irritation.
Ingestion: Rinse mouth with water. Do not induce vomiting. Never give anything by mouth to an unconscious person. Seek medical assistance if symptoms develop.
Suitable Extinguishing Media: Foam, dry chemical, or carbon dioxide (CO2). Water may be ineffective on its own but used to cool containers.
Hazards from Combustion: Vapors may form explosive mixtures with air. Combustion can release carbon monoxide, carbon dioxide, and phenolic compounds.
Protective Equipment: Firefighters wear self-contained breathing apparatus and protective gear. Avoid inhaling smoke or vapors.
Special Precautions: Containers may rupture in fire conditions due to vapor pressure build-up. Remove undamaged containers from fire area if safe to do.
Personal Precautions: Avoid breathing vapors or mist. Ventilate area thoroughly. Remove all sources of ignition.
Environmental Precautions: Do not let the substance enter drains or watercourses. Prevent further leakage or spillage if safe to do.
Clean-Up Methods: Use inert absorbent material such as sand or vermiculite. Collect and place in suitable containers for disposal. Wash spill area with water, ventilate.
Handling: Work in a well-ventilated area. Avoid contact with eyes, skin, and clothing. Use nonsparking tools and explosion-proof equipment.
Storage: Keep tightly closed in original container in a cool, dry, well-ventilated area away from heat sources and oxidizers. Protect from sunlight. Store away from food and incompatible substances.
Additional Safeguards: Ground and bond containers when transferring to prevent static discharge.
Engineering Controls: Use local exhaust ventilation to keep vapor concentrations below exposure limits. Ensure eyewash stations and safety showers are nearby.
Personal Protective Equipment: Wear chemical-resistant gloves (nitrile recommended), safety goggles or face shield, and laboratory or industrial clothing. In case of insufficient ventilation, use a suitable respirator.
Occupational Exposure Limits: Specific government or industry limits may not be set for 4-Phenyl-1-Butene itself; apply general measures for similar alkenes and aromatic compounds.
Appearance: Clear, colorless to pale yellow liquid
Odor: Aromatic, sweet
Boiling Point: Around 197 °C
Melting Point: Not well defined, below room temperature
Flash Point: Around 60–65 °C (closed cup)
Solubility: Insoluble in water, miscible with many organic solvents
Vapor Pressure: Low at standard temperature
Density: Around 0.9 g/cm³
Chemical Stability: Stable under normal conditions, sensitive to strong light, heat, oxidizers.
Conditions to Avoid: Exposure to open flames, elevated temperatures, static discharge.
Incompatible Materials: Strong oxidizing agents, acids, and bases may trigger hazardous reactions.
Hazardous Decomposition Products: Burning releases phenolic compounds, carbon monoxide, and irritant fumes.
Polymerization: May occur with exposure to strong acids or heat but not typical under storage conditions.
Acute Effects: May cause irritation to eyes, skin, and respiratory tract. Vapors can cause headache, dizziness, or nausea at high concentrations.
Chronic Effects: Prolonged or repeated exposure may result in contact dermatitis or chronic irritation. Data on long-term toxicity is limited.
Sensitization: Not known to cause allergic reactions in most cases.
Carcinogenicity: Not classified as carcinogenic by major agencies, but aromatic compounds in general warrant careful handling until more data emerges.
Toxicity Data: Animal studies suggest moderate toxicity through ingestion and inhalation.
Aquatic Toxicity: Expected to be harmful to aquatic life with long lasting effects, based on structure-activity relationships seen with aromatic hydrocarbons.
Mobility: Low solubility in water, likely to partition to soil or sediments more than remain in water.
Persistence/Degradability: Slowly biodegradable by microbes under aerobic conditions; may persist if released to the environment in large amounts.
Bioaccumulation: Potential exists for bioconcentration in aquatic organisms due to moderately high log Kow.
Disposal Methods: Collect and deliver to licensed hazardous waste disposal facility. Do not discharge untreated material to drains, surface water, or soil.
Container Disposal: Dispose of containers through professional waste handlers; avoid reuse.
Special Precautions: Incineration possible under controlled conditions that capture emissions.
UN Number: Check with applicable regulations for similar flammable liquids.
Transportation Hazard Class: Flammable liquid
Packing Group: Usually Packing Group III
Labels: Flammable liquid label required for larger quantities.
Precautions: Keep away from heat, sparks, and open flames during handling and transport.
Chemical Inventory Status: Listed on major national and international chemical inventories, such as REACH (EU) and TSCA (US).
Risk Phrases: R10 (Flammable), R36/38 (Irritating to eyes and skin).
Safety Phrases: S16 (Keep away from sources of ignition), S24/25 (Avoid contact with skin and eyes), S23 (Do not breathe vapor).
Other Notes: Workplace controls and labeling requirements apply under OSHA Hazard Communication Standard in the US, CLP in the EU, and comparable frameworks elsewhere.
