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Chemical Name: 3,5-Dinitrobenzoyl chloride
Alternative Names: m-Dinitrobenzoyl chloride
Chemical Formula: C7H3ClN2O5
Appearance: Often appears as a pale yellow to brown crystalline solid, this isn’t a compound that anyone mistakes for harmless.
Odor: Strong, pungent, sharp—most would never forget that bite if they’ve worked with acid chlorides.
Common Uses: This compound shows up in both academic and industrial research, mainly for the synthesis of more complex organic molecules. It lands on the bench in places that handle nitro and chloroaromatic synthesis, which already brings risks that can’t be ignored.
GHS Classification: Corrosive to skin and eyes, irritant to respiratory system. Sensitization is also a real possibility.
Label Elements: Danger. If you’ve experienced even a small exposure, you know the seriousness behind those pictograms: skin corrosion, health hazard.
Health Hazards: Instantly causes burns upon skin contact. Inhaling dust or fumes can damage respiration; even a small dose may provoke wheezing, severe coughing, and shortness of breath.
Environmental Hazards: Dangerous to aquatic life. This isn’t something you want going down the drain without a second thought.
Chemical Content: Main component: 3,5-Dinitrobenzoyl chloride (over 95% purity in most research chemicals).
Relevant Impurities: Traces of related dinitro compounds, especially if the compound comes from a less tightly controlled synthesis run.
Inhalation: Move the affected person to fresh air right away. Breathing will probably feel restricted; medical help is vital in severe cases.
Skin Contact: Remove contaminated clothing. Copiously flush with water, ideally using an emergency shower for at least 15 minutes, because the burns are corrosive and deep.
Eye Contact: Flood eyes with plenty of water, lifting eyelids. Even a splash can rapidly damage tissue. Seek immediate medical help.
Ingestion: Do not induce vomiting. Rinse mouth if possible. Urgent medical attention, as acid chlorides react with water in the mouth and throat, causing further burns.
Suitable Extinguishing Media: Dry powder or carbon dioxide work best. Water is risky, as it may accelerate the reaction and release hazardous gases.
Hazardous Combustion Products: Produces toxic fumes such as hydrochloric acid, nitrogen oxides, and phosgene during burning.
Firefighter Protection: Full protective gear and self-contained breathing apparatus is necessary; smoke exposure puts lungs at acute risk.
Other Notes: Fires involving acid chlorides are notoriously hazardous—not your typical blaze to tackle with just a hand-held extinguisher.
Personal Protection: Don’t attempt cleanup without chemical-resistant gloves, safety goggles, and a lab coat or chemical apron. Respiratory protection is wise, because dusts and vapors will irritate fast.
Spill Cleanup: Scoop solid material with care. Neutralize with a mild alkaline solution (like sodium bicarbonate slurry) only if proper ventilation is available. Ventilate area thoroughly.
Environmental Prevention: Never let this substance reach drains or waterways.
Handling Instructions: Open containers only in fume hoods. Avoid breathing in dust or vapors, and keep containers tightly sealed when not in use.
Storage Conditions: Store locked up, away from moisture and incompatible substances like strong bases, water, or oxidizers. Ideally, a ventilated, cool, dry chemical cabinet dedicated to corrosives.
Container Materials: Use glass or certain types of resistant plastics—metal lids can corrode quickly under this stuff.
Engineering Controls: Handle only in fume hoods or glove boxes to trap dust and fumes.
Personal Protective Equipment: Lab gloves rated against acid chlorides, tightly fitting safety goggles, full-length lab coat, and closed shoes. Respiratory mask with an acid gas cartridge if exposure seems likely.
Hygiene Measures: Never eat or drink where this chemical is handled. Wash hands and face after using, even if you wore gloves.
Physical State: Crystalline solid, usually pale yellow to light brown.
Melting Point: Around 82-85 °C, though this can shift with impurities.
Boiling Point: Decomposes long before it boils; most users will notice the signature stinging vapors well before then.
Solubility: Breaks down rapidly in water, making water an enemy for safe handling. Soluble in most chlorinated solvents.
Odor: Strong, chemical, biting.
Chemical Stability: Unstable in the presence of moisture. The acid chloride group reacts instantly with water to release HCl gas—a characteristic everyone should treat with respect.
Reactivity: Attacks nucleophiles like alcohols, amines, and especially water. Violent reactions sometimes happen with strong bases or oxidizers.
Routes of Exposure: Inhalation, skin and eye contact, ingestion.
Acute Effects: Severe burns, tissue corrosion, respiratory irritation even at low levels.
Chronic Effects: May cause dermatitis or more persistent respiratory troubles from repeated low-level exposures.
Aquatic Toxicity: Toxic to aquatic organisms, produces long-lasting adverse effects in water environments.
Persistence and Degradability: Degrades slowly in the environment if released; nitroaromatic breakdown poses difficulties for water treatment plants.
Disposal Methods: Treat as hazardous waste. Incineration in a suitable facility renders the safest result. Stay away from the drain, as water treatment cannot neutralize its hazards.
Contaminated Containers: Triple rinse, then treat with neutralizer for acid chlorides; dispose of in chemical waste streams prescribed for corrosives.
UN Number: Assigned for transport as a dangerous good. Classified under corrosive substances.
Packing Group: II or III, subject to regulations for packing and labeling.
Transport Conditions: Ship in tightly closed, properly labeled containers, with all supporting paperwork showing corrosive and toxic hazards.
Regulatory Status: Covered by regional, national, and international regulations for handling, transport, and disposal of hazardous chemicals.
Employer Responsibilities: Provide training, PPE, and maintain access to real MSDS documents.
User Responsibilities: Follow all stated safety measures, use containment, and never get complacent around acid chlorides like this one.
