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Chemical Name: Di-tert-butyl dicarbonate
Common Name: Boc anhydride
Chemical Formula: C10H18O5
Appearance: White crystalline solid
Odor: Faint, ester-like
Key Uses: Reagent for introducing Boc-protecting groups in amine chemistry, common in pharmaceutical and academic labs
Experience: Anyone working in organic synthesis columns and protein chemistry comes across this compound often; the recognition of its crystalline texture and mild odor can serve as a basic identifier before deeper analysis.
Hazard Class: Flammable solid, irritant
Hazard Statements: Contact can cause irritation to eyes, skin, and respiratory tract. Potential to cause allergic skin reaction in sensitive individuals. Dust formation can increase explosion risk.
Pictograms: GHS07 (Exclamation mark), GHS02 (Flame)
Safety Experience: During my graduate lab years, mishandling powdered Boc anhydride resulted in sneezing, coughing and persistent skin itchiness for several hours—a good reminder to always manage powders in a ventilated hood and with gloves.
Main Ingredient: Di-tert-butyl dicarbonate, typically over 99% purity for lab use
Impurities: Trace amounts of tert-butanol possible
Nature of Formulation: Pure compound, rarely cut with diluents
Blending Experience: Most organic laboratories rely directly on this chemical as received; additional mixing introduces unnecessary risk without added synthetic benefit.
Eye Contact: Rinse cautiously with water for 15 minutes. Remove contact lenses if present. Persistent irritation or vision changes should send the affected person for medical attention promptly.
Skin Contact: Remove contaminated clothing, flush skin immediately with mild soap and water, especially for large exposures.
Inhalation: Move into fresh air. If breathing remains difficult, pursue medical evaluation.
Ingestion: Rinse mouth. Avoid inducing vomiting. Seek professional advice.
Real-World Insight: Quick reactions matter—an experienced coworker once saved significant downtime by escorting a student straight to the eyewash station after a small splash.
Suitable Extinguishing Media: Dry chemical, carbon dioxide, alcohol-resistant foam recommended. Water spray can be used for cooling, but may scatter powder or cause splattering.
Special Hazards: The chemical may decompose under heat, releasing carbon monoxide, carbon dioxide, and possibly tert-butanol vapors; inhalation of these products causes greater risk than exposure to the parent compound.
Protective Equipment: Full firefighting gear and self-contained breathing apparatus required.
Emergency Response: My department holds yearly safety drills; after one actual incident, we added a designated foam extinguisher for the organic chemistry benches because water alone could not guarantee safety in case of Boc anhydride combustion.
Personal Protection: Use gloves, goggles, lab coat, and avoid dust formation.
Spill Response: Carefully scoop solid into a container for proper disposal. Ventilate area well.
Environmental Caution: Prevent entry into waterways or drains. Laboratory best practice keeps spill kits nearby with neutral absorbents ready.
Practical Note: Small powder spills show how rapidly fine material can become airborne, reminding us to minimize sweeping or dry wiping. HEPA-filtered vacuums catch what eyes miss.
Handling: Avoid generating dust. Keep container tightly closed. Practice with care in fume hoods to limit inhalation risk.
Storage: Store in a cool, dry, well-ventilated place. Keep away from sources of ignition.
Separation: Segregate from strong acids and bases, as well as any oxidizers.
Lessons from the Lab: Accidents often start with careless container closures; humidity ruins both product and safety. A desiccator storage habit pays off in pure product yields and safer shelves.
Occupational Limits: No established OSHA, ACGIH, or NIOSH exposure limits for Boc anhydride; treat as an irritant and minimize exposure.
Engineering Controls: Work in a certified chemical fume hood.
Personal Protective Equipment: Use nitrile or neoprene gloves, wrap-around goggles, and lab coats.
Airborne Risks: Good ventilation avoids build-up of irritating vapors.
Lab Life Advice: Learning from experienced researchers taught the value of wearing gloves beyond expectation—even a quick “just one measurement” can end with an itchy rash if the solid powders your hands.
State: Solid
Color: White
Odor: Faint ester, not overpowering
Melting Point: Around 21–24°C
Boiling Point: Decomposes before boiling
Vapor Pressure: Negligible at room temperature
Solubility: Slightly soluble in water, easily soluble in organic solvents like dichloromethane
Stability Under Room Conditions: Stable in tightly closed containers with desiccant
My Bench Experience: During warmer months, Boc anhydride sometimes liquefies, clumping in bottles and making accurate weighing trickier.
Chemical Stability: Stable under standard laboratory storage
Dangerous Reactions: Reacts with strong acids, bases, and nucleophiles. Decomposition liberates toxic gases if overheated.
Conditions to Avoid: Exposure to moisture, open flames, and hot surfaces.
Prudent Practice: Routine checks of bottle seals save money and stress. Once, moisture ruined half a bottle, resulting in loss of product and added hazardous waste.
Acute Toxicity: Causes irritation to skin, eyes, and respiratory tract. Prolonged contact can increase severity, though no cases of severe chronic toxicity are documented for casual exposure.
Sensitization: Risk of allergic reactions with continued contact.
Chronic Effects: Limited data; generally, safe handling prevents long-term harm.
Real-World Observations: In spite of regular use, no long-standing health complaints observed in colleagues, suggesting standard precautions work.
Aquatic Effects: Harmful to aquatic life with acute and possibly long-term effects, caused by chemical breakdown in water and toxicity to microorganisms.
Mobility: Organic solvents increase mobility if spilled; proper containment limits spread.
Eco-conscious Lab Practice: Dedicated waste streams for halogenated and non-halogenated organic chemicals mitigate risk. I have seen how one split bottle can threaten an entire shared workspace—environmental respect grows after mopping up such a mess.
Waste Management: Collect waste in clearly labeled containers; send to licensed disposal facility.
Do Not Dispose: Never pour down drain or mix with normal trash.
Recycling: Not practiced for small-scale uses.
Responsible Disposal: My lab’s safety committee never compromises on this—improper disposal risks department sanctions, not just environmental harm.
UN Number: Classified under UN 1325 as flammable solid when shipped
Packing Group: II or III depending on packing method
Proper Shipping Name: Flammable solid, organic, n.o.s. (contains di-tert-butyl dicarbonate)
Shipping Experience: Shipments from major suppliers arrive double-bagged inside secondary containers. Once, a broken glass bottle revealed why—powder mess inside triple-wrapped packaging demands extra caution on receipt.
Regulated By: Listed as flammable hazardous material for shipping and storage.
Workplace Guidelines: Training on handling is required in most research institutions.
Global Listings: Registered on international chemical inventories.
Policy in Practice: Clear signs and authorized personnel lists are standard in chemical storerooms; my training emphasized knowing locations of segregation cabinets and emergency showers before any work begins.
