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Chemical Name: 2-Chloro-1-bromopropane
Synonyms: 1-Bromo-2-chloropropane
Chemical Formula: C3H6BrCl
CAS Number: 109-70-6
Appearance: Clear, colorless to pale yellow liquid, noticeable odor
Common Uses: Often handled in laboratories as an alkylating agent or a reagent for organic synthesis, 2-Chloro-1-bromopropane doesn’t pop up in consumer goods. Keeping chemicals like this isolated from shared workspaces adds a layer of safety that should never be underestimated.
GHS Classification: Harmful if inhaled, swallowed, or in contact with skin
Hazard Pictograms: Exclamation mark, health hazard
Signal Word: Warning
Potential Hazards: Skin and eye irritation, possible respiratory distress if mist or vapors reach the lungs, and central nervous system depression with heavy exposure further stack up the risk. Splashing can burn eyes or irritate skin, so gloves and goggles look less like formality and more like necessity in labs. The vapor, heavier than air, can drift along floors and collect in low spots. One doesn’t hear about it, but that property makes good ventilation non-negotiable. Anyone treating volatile organic compounds as routine ignores the stories behind well-documented incidents.
Main Ingredient: 2-Chloro-1-bromopropane (C3H6BrCl), typically present at or near 100% in laboratory-grade stock
Impurities: Usually minimal in high-purity reagent, but residues of related haloalkanes from manufacturing could be present. Ensuring high purity speaks directly to both yield in research and safety, as unidentified impurities can complicate toxicological profiles.
Inhalation: Move affected people into fresh air immediately, loosen tight clothing, keep them still. If breathing falters, trained responders give oxygen. Medical attention should not be delayed.
Skin Contact: Strip off contaminated clothing, rinse skin under running water, and avoid harsh scrubbing. Chemical burns, rare as they are, demand prompt medical evaluation.
Eye Contact: Flush eyes with water—plenty of it—for at least fifteen minutes. Remove contacts only if easy. Eyewash stations should be easy to find in any space handling halogenated solvents.
Ingestion: Don’t induce vomiting. Rinse mouth, keep the person calm, and get medical help. Swallowing organic halides by accident sometimes happens when people eat or drink around chemicals or pipette by mouth, a practice long since banned for good reason.
Fire Hazards: Vapors can form flammable mixtures with air. In a fire, toxic gases such as hydrogen chloride, hydrogen bromide, and phosgene can form.
Suitable Extinguishing Media: Use dry chemical, foam, or carbon dioxide. Water sprays help cool containers but direct streams spread spills.
Protective Equipment: Self-contained breathing apparatus and full protective gear are a must due to toxic breakdown products. Fire spreads quickly with volatile organics, and the fumes put firefighters at risk even well after flames die down.
Special Procedures: Remove containers from fire area if safe. Evacuation is sometimes the lesser evil due to evolving gases.
Spill Response: Evacuate bystanders, ventilate space, and contain spills with inert absorbents like sand or vermiculite. Managing a spill of halogenated solvent isn’t just about mopping—it’s also about thinking two steps ahead to avoid breathing in vapor or letting the material escape down drains.
Protective Measures: Gloves, goggles, and respirators for substantial releases. Keeping spill kits in working order and knowing how to use them separates routine from risk.
Cleanup: Collect residues in sealed, labeled containers for hazardous disposal. Always avoid using combustible material such as sawdust, which might trigger chemical reactions.
Handling Precautions: Only handle in well-ventilated chemical hoods. Open containers slowly, watch for pressure buildup. Avoid direct skin and eye contact.
Storage Guidelines: Keep containers sealed when not in use, store away from heat, direct sunlight, ignition sources, and incompatible substances such as oxidizers. Keeping chemical compatibility charts nearby and double-checking them before stacking or shelving containers helps prevent subtle disasters.
Other Notes: Storing halogenated organics far from food and drink is basic but critical; accidental cross-contamination in shared fridges or storage cabinets introduces real health hazards.
Exposure Limits: Specific regulatory exposure limits for 2-Chloro-1-bromopropane may not be universally established, but its status as an irritant and central nervous system depressant means that caution wins out over assumption.
Engineering Controls: Work always in a fume hood or well-ventilated area.
Personal Protective Equipment: Impervious gloves (nitrile or neoprene), lab coats, splash goggles, and in cases of potential high exposure, organic vapor respirator. Removing gloves before touching phones, doorknobs, or one’s face keeps invisible contamination from spreading.
Hygiene Measures: Wash hands thoroughly after use, avoid bringing chemical residues out of the lab on unwashed skin or clothes.
State: Liquid
Color: Colorless to pale yellow
Odor: Sharp, somewhat sweet or pungent
Boiling Point: 120 to 125°C
Flash Point: Around 28°C (82°F), which signals a danger when working near ignition sources or in summer conditions.
Density: Roughly 1.5 g/cm³ at room temperature
Solubility: Low solubility in water, mixes well with organic solvents like ether and alcohol.
Vapor Pressure: Not negligible, so closed storage prevents vapor buildup. Short boiling ranges and high vapor pressures make rapid evaporation a real risk during spill cleanup or handling in open dishes.
Chemical Stability: Stable in sealed containers under ordinary conditions.
Reactive Conditions: Strong oxidizing agents, strong bases, and strong acids prompt decomposition, risking violent reaction or toxic gas formation.
Hazardous Decomposition: Hydrogen chloride, hydrogen bromide, and traces of phosgene, which present major health and environmental hazards if generated in significant quantities.
Polymerization: Not expected under normal storage or use. It’s not the type of compound that erupts into runaways like peroxide-formers or azides, but hazardous products still demand vigilance.
Likely Routes of Exposure: Inhalation, ingestion, skin absorption
Acute Symptoms: Headache, dizziness, nausea, shortness of breath. Skin and eye irritation can follow contact. Laboratory incidents show that effects often start subtly, so anyone feeling unwell after exposure should step out and report it.
Chronic Effects: Extended, repeated exposure may affect the central nervous system and liver. Cancer risk data remains limited, but the structure—halogenated organics—invites caution due to similarities with confirmed carcinogens.
Sensitization: No strong evidence for allergic sensitization, but skipping gloves or eye protection has led to many regretted exposures.
Environmental Fate: Not rapidly biodegradable. Tends to persist in soil or water if released.
Ecotoxicity: Halogenated solvents often pose a threat to aquatic organisms, and evidence for this compound fits the pattern. Rapid evaporation lessens direct risk in surface water, but spilled material that seeps into groundwater or soil has long-term impacts. Neighborhoods near historic manufacturing sites often face legacy contamination due to such chemicals.
Bioaccumulation: Modest bioaccumulation; the main risk lies more in toxicity than buildup.
Waste Management: All leftover reagent, absorbents, and contaminated PPE count as hazardous waste. Don’t pour down the drain—local water treatment can’t remove organic halides, compounding environmental burdens. The landfill option is no fallback, as volatile compounds can leach out.
Preferred Disposal: Send sealed waste containers to licensed hazardous waste contractors. Small-scale lab users do well to join pooled chemical waste pickups to keep costs manageable and avoid storage backlogs, which increase accident potential.
Regulatory Pressure: Untreated releases risk legal action. Recent pushes in many cities for cradle-to-grave traceability of chemicals leave little room for cutting corners.
UN Number: Usually shipped under UN 1993, flammable liquid, n.o.s. (not otherwise specified)
Transport Hazard Class: Class 3 (Flammable liquids)
Packing Group: II or III, indicating moderate danger
Transport Precautions: Use certified containers, keep upright, away from heat and ignition sources. Transport documentation must clearly state hazard nature and destination. Delivery drivers often receive training in emergency spill response, reflecting society’s commitment to containing risks before they escalate.
Relevant Directives: Subject to chemical safety rules under legislation like OSHA (workplace handling), REACH (European chemical safety), and hazard communication standards.
Labeling: Correct hazard labeling, risk statements, and pictograms must always show on original and in-use containers. Regulatory gaps sometimes emerge when repackaging happens outside regulated facilities, so vigilance about relabeling protects everyone involved.
Special Restrictions: Purchase and use are often limited to individuals with proper training and institutional oversight. Oversight committees or local environmental protection authorities require notification for use above threshold quantities.
Worker Right to Know: Any workplace using 2-Chloro-1-bromopropane must provide training and ready access to safety information for all staff, not just research or warehouse teams. Lack of information almost always underlies occupational exposures and accidents; public policy in chemical safety has shifted for good reason toward universal transparency standards.
