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Fate often plays its hand quietly in the world of chemistry, and 2-aminophenol is a good example. Scientists uncovered this compound as the chemical sciences started to mature, back in the late 1800s, when aniline dyes turned Europe’s textile industry upside down and researchers scrambled to chase new derivatives. The discovery of 2-aminophenol came straight out of those heady days, as organic chemists realized that combining functional groups on a simple benzene ring could create all manner of new substances, not only for dyes but also for medicines and other applications. Over time, 2-aminophenol was refined from a laboratory curiosity into an industrially relevant substance, trusted for its reliability and the broad utility that comes when one small molecule can go so many directions.
Let’s talk about what 2-aminophenol actually brings to the table. You’re looking at a white to pale brown crystalline solid. Water solubility stands out, which makes it practical for synthesis and processing, though some folks find its slight solubility in organic solvents useful, too. Chemists see the hydroxyl and amino groups on the benzene ring—each at the ortho position—and realize that this arrangement means the molecule can react both as a weak base and as a nucleophile, opening doors for further chemistry. Industry has leaned into its dual reactivity for decades, building everything from dyes and pharmaceuticals to rubber antioxidants with this compound as a critical starting block.
Looking at its properties through the lens of practical chemistry, you’ll find 2-aminophenol melts at about 170-174°C. At room temperature, it holds steady as a solid and resists decomposition in air unless exposed to strong heat or oxidizers, so storage tends to be straightforward with decent ventilation. Its formula—C6H7NO—might seem deceptively simple, but the arrangement gives it plenty of punch. Both -NH2 and -OH groups participate in hydrogen bonding, which explains not just solubility in water but also some of its behavior in organic reactions. This reactivity makes it possible to link with a diverse cast of reagents and build out more complex molecules.
On the technical side, you don’t see a wild swing in quality when you source 2-aminophenol from reputable suppliers. Purity hovers around 99% for most uses, with trace impurities rooted out through crystallization and recrystallization during manufacturing. Labelling usually includes the compound’s name, CAS number (95-55-6), and structure, letting chemists or operators know exactly what they’re working with. Storage advice typically points toward a cool, dry place away from oxidizers, preventing conditions that could provoke slow decomposition or byproduct formation.
Producers don’t rely on a single recipe. The classic route starts with nitrophenol or nitrobenzene, which undergoes reduction—zinc in alkaline solution stays popular because it’s reliable and effective. Some plants use catalytic hydrogenation, which speeds things up and scales well for industry, but it needs high-end equipment to handle the hydrogen safely. I’ve worked on projects that took leftover phenol derivatives, ran them through the right set of reductive steps, and turned waste into valuable chemicals. Sustainability starts making sense when these kinds of process tweaks let you extend raw materials and trim down waste.
If someone asks why chemists like 2-aminophenol so much, its chemistry tells the story best. The molecule’s amino and hydroxyl groups go through classical reactions—acylation, alkylation, diazotization, and more—resulting in new compounds that power industries ranging from dyes to imaging. For instance, diazotization followed by coupling delivers vivid dyes used in textile printing. In the pharmaceutical world, modifications to the backbone can birth antipyretic or analgesic drugs. Condensation reactions expand the aromatic core, showing just how versatile and forgiving this molecule can be in the hands of a good chemist.
Chemists can get caught up on names, especially since familiar compounds go by more than one handle. 2-Aminophenol pops up as ortho-aminophenol, o-aminophenol, or even 2-hydroxyaniline in the literature and on lab shelves. These synonyms matter for sourcing or regulatory compliance, especially in large organizations where the same chemical might slide under different names in inventory or shipping papers.
Experience reminds you fast that even common chemicals demand respect. For 2-aminophenol, safe handling means gloves, good ventilation, and a watchful eye for dust or spills. Inhalation or skin exposure brings risk of irritation, and large exposures raise concerns around methemoglobinemia, a condition where the blood’s ability to carry oxygen drops. It’s not a chemical to fear, but to treat with the respect it deserves, backed by up-to-date safety protocols and accessible material safety data sheets. Regulations such as OSHA in the US set exposure limits, and workplaces enforce eye protection and emergency wash stations as standard procedure.
People first learned to value 2-aminophenol for the robust dyes it made possible, but applications expanded rapidly. Its versatility fits the needs of both textile manufacturers and pharmaceutical researchers. Dye-makers see it as a bridging block in azo dye synthesis, while in medicine, it’s become a pathway to paracetamol and other drugs. Engineers use it in rubber manufacturing, seeking chemical stability or antioxidative strength. In recent years, the electronics sector also found value, as the molecule helped craft certain photographic developers and chelating agents essential for analytics and imaging.
2-Aminophenol has turned into a springboard for research, especially as the push for greener chemistry picks up steam. R&D teams chase catalytic systems that trim down reaction waste or switch out hazardous reagents. At academic conferences, you can sit in on talks exploring new polymer materials where 2-aminophenol-derived monomers bring unique electrical or mechanical properties. There’s a palpable drive to move labs and factories away from outdated, energy-intensive syntheses so each batch comes out with less environmental baggage. Every time researchers tune reactivity or substitute cleaner catalysts, it’s a win not just for business but for the planet itself.
There’s no sugarcoating the need for diligence. Toxicologists know aminophenol carries moderate acute toxicity. Tests in lab animals flagged risks like kidney and liver stress after prolonged exposure. Short-term effects tend to involve nausea, skin irritation, or headache, which matches occasional lab experience. Efforts to clarify long-term outcomes resulted in a cautious approach toward waste disposal and exhaust scrubbing in factories. Both regulatory bodies and health researchers stress the value of closed handling systems, improved PPE, and routine medical monitoring. Laboratories and production sites keep tweaking best practices to drive accidents and exposures downward, and each new study brings sharper insights into mechanisms of harm.
2-Aminophenol keeps getting new life as industries evolve. Green manufacturing priorities push suppliers to refine synthetic routes with milder conditions and more selective catalysts. Emerging tech industries may increase demand for derivatives that work as intermediates in electronics, sensors, or polymer science. Data-driven techniques could spur smarter process monitoring, cutting energy costs and carbon footprint. As the world leans into digital and molecular innovation, those who invest in understanding and refining the core chemistry—starting with foundational substances like 2-aminophenol—stand to make a real difference both for their bottom line and for broader societal goals. The challenge isn’t just how much more the molecule can do, but how well we can manage it for safety, sustainability, and new applications that few people saw coming a generation ago.
Growing up around a family of chemists, I’ve seen 2-Aminophenol in action long before I knew its name. This white-to-light-brown powder, sometimes giving off a faint medicinal odor, shows up in places most folks would never spot. At home, I caught glimpses of small brown bottles on my grandfather’s crowded workbench. As I learned more, it became clear: 2-Aminophenol isn’t just some chemistry class curiosity; it plays a serious part in real life.
Textile workers and hair stylists depend on vibrant, lasting colors, and 2-Aminophenol sits right in the mix of that process. It provides the backbone for several dyes, thanks to its amino and hydroxyl groups—a fact supported by years of industrial usage. Companies trust it to help craft colors both stable and intense enough to stand up to everyday washes. In my own experience seeing textile work in action, seeing how small tweaks in ingredients shift an end product’s color reinforced how vital each compound can become. 2-Aminophenol helps deliver hues that last through repeated use.
Walking into a pharmacy, people rarely think about where painkillers, fever reducers, and antibiotics begin. Behind the shelves, 2-Aminophenol does a lot of heavy lifting in drug development. Pharmaceutical companies use it to synthesize paracetamol (acetaminophen), a pain and fever medication millions reach for every week. Without 2-Aminophenol, pharmacists and doctors would face much steeper challenges making trusted medicines. This shows how raw chemical know-how underpins basic healthcare.
My uncle ran a darkroom in the 1990s, tucked away in a damp garage behind his house. He kept packs of developing agents stacked near chemicals like 2-Aminophenol. For years, formulas built around this compound helped photographers process black-and-white prints. Even though much of photography has shifted digital, restoration shops and art students keep these traditional methods alive. The staying power of old-school chemistry like 2-Aminophenol proves that roots in science keep art from fading away.
Every chemical use comes with responsibilities. Production and handling of 2-Aminophenol call for strict attention to workplace safety. It can irritate skin and eyes, and inhaling dust isn’t great for the lungs. Factory operators, lab techs, and chemical transporters ought to use masks and gloves, proper ventilation, and follow chemical waste rules. Simple, clear labeling and continuous safety training help keep accidents down and health protected. Regulators in the US and EU have published guidance on 2-Aminophenol’s safe use—these rules exist to keep families and workers safe.
Cleaner processes can cut pollution from dye and drug manufacturing. Research groups are focusing on recycling steps and greener chemistry to help reduce environmental strain. Sometimes, solutions come from unexpected places: universities, small startups, veteran factory hands. Families like mine have seen how curiosity and safety-mindedness can support better practices in the workplace, whether it’s switching to solvent-free methods or better waste collection. A responsible approach lets 2-Aminophenol stay useful without making life risky on the job or at home.
2-Aminophenol isn’t just a lab ingredient—it’s a chemical that appears in hair dyes, photographic developers, and even pharmaceuticals. To the untrained eye, it might look like any white crystal or powder, but it packs a punch. Skin, eyes, and lungs all react quickly when exposed. Let’s be real: few people truly appreciate how easily a small mistake with this substance can change a regular workday.
This chemical can cause irritation, and not a mild itch—think burning rashes and persistent coughs if the powder floats into the air. My work in a university lab brought home that simple gloves or a mask sometimes aren’t enough; people walked away with red eyes and sneezes after hurrying through cleanup or skipping a safety step. The U.S. National Library of Medicine points out that repeated exposure raises the risk of allergic reactions or worse—possible effects on internal organs. Data from the CDC highlights the same thing: even inhaling low levels over time could cause headaches, dizziness, and, in some cases, affect breathing.
Forget the myth that only large spills matter. I’ve seen smaller accidents do just as much damage, especially if you don’t wash up straight away or get distracted. A solid pair of chemical-resistant gloves protects your hands, while goggles shield your eyes from both powder and vapors. For those working with open containers or during transfers, a full lab coat and face shield add another layer of insurance. Ventilation counts just as much—fume hoods aren’t optional here. A friend once waved off the requirement for proper airflow and everyone in the room ended up coughing and scrambling outside.
Once the work’s over, storage turns critical. This stuff reacts with strong oxidizers—so mixing up chemical shelves or cutting corners can invite serious accidents. Always check labels; keep 2-Aminophenol in a tightly sealed container, away from heat and incompatible chemicals. During disposal, pouring liquids down the drain never proves safe or legal. Speaking from mishaps I’ve seen, one lazy cleanup led to a brief but scary evacuation. Companies like Sigma-Aldrich and the European Chemicals Agency recommend using local hazardous waste channels, and documenting each handoff. It’s not just about rules, it’s about making sure nobody down the line suffers from quick-fix thinking.
Training sessions won’t win any popularity contests, but that every-year safety refresher gives veterans and newcomers the same message: complacency bites. If you’re handling 2-Aminophenol, point out every step to those around you—even old hands benefit from reminders. I’ve seen teams share near-misses as learning moments, because nothing beats hearing about real slipups.
Real safety comes down to steady, practical habits and not assuming “it won’t happen to me.” Use the safety data sheets, ask questions if you’re unsure, and never rush the process. The right gear, careful labeling, and attention to ventilation do more than tick boxes—they keep people out of the emergency room. Safety in the lab or workplace runs on common sense, not just red tape.
Many folks who tinker with dyes, pharmaceuticals, or even developers in the old-school world of photography have probably worked with 2-Aminophenol. This little compound plays a big part in chemical industries and labs all over, but understanding its makeup is what gives it value beyond just a bottle on a shelf.
2-Aminophenol is an aromatic compound. At its core, it’s a benzene ring — six carbon atoms holding hands in a flat circle, known in organic circles as the foundation for lots of familiar molecules. Hanging off that ring are two key groups: an amino group (-NH2) and a hydroxyl group (-OH).
The twist with 2-Aminophenol: those groups attach to neighboring carbons. Chemists call this the "ortho" position. It might sound like an odd detail, but this placement shapes its chemical personality and everything that comes from it, from reactivity to how it shows up in final products.
Looking at the basics, the chemical formula checks in as C6H7NO. Simple on the surface, yet this signals a story of versatility. That ring with its two sidekicks – one ready to make new bonds with acids, another ready to play with bases or get oxidized – that turns 2-Aminophenol into a building block of things you probably bump into every day.
You won’t see this kind of structure with just any chemical. The precise arrangement helps explain why 2-Aminophenol dissolves in water better than straight-up benzene. That means labs get to use it in more reactions, a big reason it’s popular in making hair dyes, antioxidants, and even some medicines.
Factories and research labs lean on 2-Aminophenol because it bridges chemistry and industry. For example, it’s a favorite starting material for synthesizing paracetamol. In that medicine aisle, a basic chemical end up fighting headaches. Dye makers rely on it for deep, lasting colors that get into the fibers, not just the surface. People developing photographic film—those still holding onto analog over digital—use it in film-developing baths, where its reactivity produces classic black-and-white images.
With this much action, safety becomes important. The groups attached to the benzene ring can interact with living cells, so proper handling matters as much as knowing the chemistry. Wearing gloves and goggles isn’t just a rule written on a safety sheet; it’s a habit that’s saved my skin more than once in the lab. Chemicals don’t ask if you know the names behind the formulas before doing their thing.
Knowledge makes for stronger decisions — that’s why digging into the chemical structure of 2-Aminophenol pays off for professionals mixing up dyes, developing new drugs, or studying organic reactions. With access to reliable material safety data and best practices, handling this compound supports better outcomes and keeps people safe.
As industries grow and more folks try their hand at homemade chemistry, it’s worth pushing for more education on these building blocks. That means not just memorizing formulas but really grasping how those groups and rings play together — and how that shapes what happens in the beaker, in the final product, and in our health.
2-Aminophenol seems unassuming at first glance—a white or slightly reddish crystal that appears in labs and chemical storerooms across the world. But up close, this compound can surprise you. Its reactivity picks up in the right (or wrong) conditions. Thinking back to chem lab routines, a nudge from heat, moisture, or oxygen makes all the difference between safe storage and a lot of extra paperwork after a spill or worse, a fire.
Here’s the crux: 2-Aminophenol oxidizes pretty easily. If moisture hangs in the air or the temp creeps above room levels, the crystals darken and break down. Decomposition can release hazardous fumes, including nitrogen oxides. Handling this stuff demands respect—a lesson shared the hard way by some lab techs who left it by sunny windows, only to clean up after unpleasant surprises. The US National Institute for Occupational Safety and Health (NIOSH) and other regulators highlight it as both a health and fire risk. Breathing in the dust or getting it on skin can cause irritation and more severe health problems over time.
I always look for a dry, cool, dark space with a steady temperature—around 15-25°C feels just right. Humidity bleeds in trouble. Choosing a tightly sealed amber glass bottle keeps out light and slows oxidation. Glass trumps most plastics, as it doesn’t react with the crystals over time. Some labs use desiccators with a drying agent for an extra layer of protection, especially in humid climates where nothing stays dry for long. Forgetting that step can ruin large batches. Silica gel packets help here, acting as silent guardians against moisture.
You skip the right storage routine, and things get messy. Oxidized 2-Aminophenol can cause health risks and cut the shelf life of your stockpile. Degraded material doesn’t just lose its punch for syntheses or dye production—it can spark fires if it dries out too much or reacts with common oxidizers. Safety data sheets from Sigma-Aldrich, Fisher, and similar suppliers all spell out the risks, but seeing a batch go brown, clumpy, and unusable after one storage mistake makes a deeper impression. No one wants to waste time or budget on preventable losses.
Good practice saves money, reduces waste, and keeps everyone safer. Training each new member of a lab team on the quirks of sensitive materials stops mistakes before they start. Regular checks—sniffing around storerooms for odd smells, or just eyeballing container seals—take only minutes but pay off. Some sites set up reminder logs so nobody can forget inspections. Clear labeling also stops confusion, and fresh batches always go behind older ones to ensure nothing lingers past prime.
2-Aminophenol calls for respect and a bit of extra care. The right bottle, a safe spot, a regular check—these habits add up, keeping people and materials safe. Sharing stories and warnings from personal experience does more than safety posters ever could. By building good habits around chemical storage, labs sidestep unnecessary drama and keep operations reliable, safe, and efficient.
2-Aminophenol finds its way into labs and production lines around the globe. Chemists use it to make dyes, build medicines, and carry out research. I’ve seen it come up in hair dye formulas and photographic developers. If you’ve walked through a paint or chemical factory, that sharp, bitter scent in the air sometimes leads back to a bottle of this compound.
Workers handle 2-Aminophenol as a powder or in solution, which means the stuff can cling to skin, rise in dust, or splash into eyes. It doesn’t need heavy contact to cause trouble; breathing in small bits day after day stacks up risks. Even small cuts become entry points. Years ago, I watched a new lab mate forget her gloves, wipe out a beaker, and finish her shift with red patches creeping up her wrist.
Touching 2-Aminophenol isn’t a mild inconvenience. Redness and burning kick in almost right away on the skin. Eyes react with tearing, itchiness, and pain. Inhaling its dust leaves a person coughing or short of breath. Think of those moments after mixing cleaning products without gloves and feeling the sting on your hands; this hits harder and lasts longer.
Long exposure raises the stakes. Those years of steady contact link directly to chronic skin conditions and respiratory trouble. I’ve met factory workers who fought eczema every winter—patches, swelling, and sores that only cleared after they left the job. Science backs up this real-life misery: repeated doses sensitize the immune system, so allergic reactions explode even at low levels.
Government research shows this compound can build up in organs, especially the liver and kidneys. Mismanaged exposure turns into long-term health decline. Evidence from animal studies and reports from chemical plants suggest links to kidney and blood disorders. While the cancer risk stays debated, the data urges caution. No product or industrial shortcut is worth sacrificing a technician’s well-being.
Lab managers and plant operators can’t afford to get complacent. Gloves, goggles, and fume hoods should be standard, not optional. Regular air quality checks and skin monitoring keep risks from becoming realities. I always told junior staff to get stubborn about their personal protection gear—no sample is more valuable than their health.
Safety data sheets shouldn’t gather dust at the back of the file drawer. Training needs to go beyond the basics; staff must recognize symptoms early and know real escape routes. Peer check-ins help, too—if someone skips protection one day, a simple reminder can save a week of trouble.
Companies can switch to safer alternatives if possible, updating processes to cut down on risk. Workers should demand transparency on what’s in the products they use. Medical screenings and regular health checks matter—those catch problems before they grow out of control. Sharing real-life stories and actual incident reports helps new team members understand the impact one careless moment can make.
Every step toward better health practices benefits the whole workplace. What matters most isn’t just profit or speed; it’s protecting people who keep the wheels turning. Safety stands on habits built day by day, not on a checklist signed once a year.
| Names | |
| Preferred IUPAC name | 2-Aminophenol |
| Other names |
2-Hydroxyaniline o-Aminophenol o-Hydroxyaniline Orthaminol Orthoxydianiline |
| Pronunciation | /tuː əˌmiːnəˈfiːnɒl/ |
| Identifiers | |
| CAS Number | 95-55-6 |
| Beilstein Reference | 136595 |
| ChEBI | CHEBI:17647 |
| ChEMBL | CHEMBL1409 |
| ChemSpider | 1208 |
| DrugBank | DB04259 |
| ECHA InfoCard | 100.034.538 |
| EC Number | 205-395-2 |
| Gmelin Reference | 85907 |
| KEGG | C02531 |
| MeSH | D016692 |
| PubChem CID | 135 |
| RTECS number | SJ7875000 |
| UNII | 9G38DT109V |
| UN number | UN2512 |
| Properties | |
| Chemical formula | C6H7NO |
| Molar mass | 109.13 g/mol |
| Appearance | White to light purple crystalline solid |
| Odor | sweet; phenolic |
| Density | 1.293 g/cm³ |
| Solubility in water | Moderately soluble |
| log P | 0.32 |
| Vapor pressure | 0.001 mmHg (20°C) |
| Acidity (pKa) | 9.76 |
| Basicity (pKb) | 9.74 |
| Magnetic susceptibility (χ) | -5.18 × 10⁻⁶ |
| Refractive index (nD) | 1.661 |
| Viscosity | 1.222 cP (25°C) |
| Dipole moment | 1.35 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 116.0 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -40.9 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -2192 kJ/mol |
| Hazards | |
| Main hazards | Harmful if swallowed, causes skin and eye irritation, may cause allergic skin reaction, harmful to aquatic life. |
| GHS labelling | GHS02, GHS07 |
| Pictograms | GHS07,GHS05 |
| Signal word | Warning |
| Hazard statements | Harmful if swallowed. Causes serious eye irritation. Causes skin irritation. May cause respiratory irritation. |
| Precautionary statements | Precautionary statements: P261, P280, P305+P351+P338, P337+P313 |
| NFPA 704 (fire diamond) | 2-Aminophenol NFPA 704: 2-1-0 |
| Flash point | 164°C |
| Autoignition temperature | 630°C |
| Explosive limits | Explosive limits: 2.6–14% |
| Lethal dose or concentration | LD50 oral rat 375 mg/kg |
| LD50 (median dose) | LD50 (median dose): Oral rat 375 mg/kg |
| NIOSH | UR7400000 |
| PEL (Permissible) | Not established |
| REL (Recommended) | 20-25°C |
| IDLH (Immediate danger) | Unknown |
| Related compounds | |
| Related compounds |
4-aminophenol resorcinol catechol aniline phenol |
