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Chemical Name: 1-Hexyne
Synonyms: Ethylbutyne, n-Butylacetylene
Molecular Formula: C6H10
CAS Number: 693-02-7
Appearance: Colorless liquid
Odor: Sharp, characteristic
Uses: Often turns up in research labs as an organic synthesis intermediate, popping up in pharmaceutical development, specialty chemical work, or advanced material studies.
GHS Classification: Flammable liquid and vapor, Acute toxicant (oral, inhalation, dermal), Skin and eye irritant
Signal Word: Danger
Hazard Statements: Highly flammable, toxic if swallowed, toxic in contact with skin, harmful by inhalation, causes eye and skin irritation
Routes of Exposure: Eyes, skin, respiratory system, digestive system
Personal Experience: Opening a bottle of 1-hexyne for a late-night reaction always set my nerves on edge; vapors seem eager to leap out, driving home why tight seals and quick handling matter.
Chemical: 1-Hexyne
Purity: Typically >95% in lab settings
Impurities: Trace alkynes or hexyl derivatives possible depending on source
Inhalation: Fresh air as fast as possible, move the exposed person away from fumes. The high volatility makes nose and lung irritation a real concern.
Skin Contact: Rinse immediately with plenty of water, strip away contaminated clothing
Eye Contact: Wash eyes under slow-running water, keeping eyelids open
Ingestion: Seek immediate medical support, don’t urge vomiting since the substance can damage internal organs quickly
Personal Experience: Accidental skin contact happened to me just once, and it shocked me how rapidly irritation set in, which reinforced my respect for wearing long sleeves and proper gloves whenever handling 1-hexyne.
Suitable Extinguishing Media: Dry chemical, CO2, alcohol-resistant foam
Inappropriate Media: Water spray on unignited spill may spread fire
Hazards: Vapor forms explosive mixtures with air, even at room temperature
Precautions: Approach from upwind, keep containers cool with water spray
Advice for Firefighters: Wear full self-contained breathing apparatus and flame-resistant suit
Personal Precautions: Evacuate area, avoid breathing vapors, ventilate heavily
Protective Equipment: Use chemical splash goggles, gloves, apron
Environmental Precautions: Prevent spillage from reaching drains or waterways
Cleanup Methods: Contain and absorb with earth, sand, or inert material. Collect remains in sealed containers for disposal.
Experience in the Lab: Carbide and alkynes don’t give much warning before a mess turns risky; quick attention to spills curbs dangerous vapor clouds.
Precautions for Safe Handling: Handle under fume hood, avoid all sources of ignition, ground all equipment
Safe Storage Conditions: Cool, well-ventilated area, away from oxidizers and acids, store in airtight containers
Technical Measures: Use non-sparking hand tools
Advice: Lock cabinets after use to keep curious hands away — after-hours handling temptations should meet tough locks, not free access.
Workplace Control Parameters: Check national/local guidelines for exposure levels; OSHA, ACGIH, and NIOSH data may have limited specifics
Engineering Controls: Always run reactions involving 1-hexyne under chemical hoods
Personal Protection: Gloves made of nitrile, flame-resistant lab coats, safety goggles
Respiratory Protection: Half-mask respirator or full-face mask if vapor levels rise
Hygiene Measures: Wash hands thoroughly after use; don’t eat or drink in work areas
Physical State: Liquid
Color: Clear, colorless
Odor: Strong, pungent
Boiling Point: About 71°C (160°F)
Melting Point: Around -123°C
Flash Point: Close to -18°C
Vapor Pressure: Elevated; evaporates easily
Solubility: Limited in water; miscible with organics
Vapor Density: Heavier than air
Density: About 0.74 g/cm³
Chemical Stability: Stable under recommended storage and use, but sensitive to prolonged air exposure
Decomposition: Flammable gases, possible formation of peroxides on long-term contact with air
Incompatible Materials: Strong acids, oxidizers, halogens
Conditions to Avoid: Heat, sparks, static discharge, sunlight
Reactivity Note: Alkynes like 1-hexyne react explosively in wrong pairings — keeping incompatible materials far apart is a safer bet.
Acute Toxicity: Harmful by all routes; ingestion or inhalation can cause nausea, headaches, central nervous system depression
Skin & Eye Contact: Redness, irritation, possible severe burns from prolonged exposure
Chronic Exposure: Liver and kidney concerns suspected with repeated contact
Personal Reflection: I’ve seen co-workers neglect gloves with a “quick test” and deal with burning pain for days — safety gear isn’t optional, especially with substances as unforgiving as 1-hexyne.
Aquatic Toxicity: Toxic to fish and aquatic life
Persistence & Degradability: May degrade slowly in natural waters
Mobility: Volatile; vaporizes quickly from soil or water
Bioaccumulation Potential: Not expected to bioaccumulate significantly
Environmental Experience: Any spill I witnessed, even small, made the air shimmer with fumes — even a few drops threaten air and water, so secondary containment became a rule, not just advice.
Waste Disposal Methods: Treat as hazardous waste, incinerate in chemical incinerator with afterburner and scrubber
Precautions: Don’t mix with household trash or pour down drains
Container Disposal: Triple rinse before disposal, follow local chemical waste regulations
Lab Note: Coordinating with professional waste handlers always made more sense than cutting corners, since even a sealed vial can leak or rupture in a landfill.
UN Number: UN 3295
Proper Shipping Name: Hydrocarbons, liquid, n.o.s. (1-Hexyne)
Hazard Class: 3 (Flammable liquids)
Packing Group: II
Label Requirements: Flammable liquid pictogram
Transport Experience: Shipping this compound between labs meant relying on specialist carriers — the regulations seem a headache, but one slip during a summer heatwave or bumpy delivery route could spark disaster, so the paperwork is worth the trouble.
GHS Compliance: Required for global shipment
Chemical Inventory Status: Listed in major inventories such as TSCA and REACH
Local Restrictions: Some countries or regions classify as a highly restricted precursor, especially for its flammability and toxicity
Safety Recommendation: Good lab and storage practices come straight from the lawbooks, but real-life stories of careless storage remind us regulations often follow hard-learned lessons.
