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Once synthetic chemistry became a formal discipline, curiosity about aromatic compounds shaped a lot of what scientists explored. P-Hydroxybenzaldehyde has a straightforward structure, but it caught the eye of chemists in the early days, partly because it bridges the worlds of aldehydes and phenols. Over time, this compound moved from small-scale lab studies to larger-scale industrial applications, driven by demand for ingredients in scents, flavors, and pharmaceuticals. Its pathway got clearer as structural analysis and chemical isolation progressed, tightening links between academic discovery and industrial needs.
You'll find P-Hydroxybenzaldehyde used as a chemical intermediate in various factories. Its power comes from the way it combines an aromatic ring with both a hydroxy group and an aldehyde group, paving the way for further modifications. Most chemical suppliers ship it as a pale-yellow crystalline solid, ready for handling in controlled environments. In my own years navigating chemical stocks, this benzaldehyde derivative turned up as a vital link in the supply chain for companies making vanillin, agrochemicals, or dye precursors. Its accessibility supports both big and small labs, reflecting robust demand and scalable production.
A melting point near 115°C. Hard to forget that sharp odor and dust—slightly bitter, faintly floral, nothing like vanilla but close to a distant cousin. P-Hydroxybenzaldehyde dissolves well in ethanol, ether, and hot water, but hangs back in cold water. Its molecular formula, C7H6O2, makes it compact. It resists oxidation under normal conditions, but strong oxidants convert it to p-hydroxybenzoic acid. I remember cautious handling to avoid skin and lung contact, as fine powder or even vapors escape with every spill.
Strict rules surround hazardous compounds. Genuine suppliers list purity, typically at or above 99%, and set limits for moisture and heavy metal content. Labels must show not just the chemical name but also its synonyms and hazard pictograms, underscoring dangers such as irritation or respiratory risk. Safety Data Sheets (SDS) back each shipment. Labs that overlook these technicalities risk more than just regulation—they risk staff safety and downstream contamination. Chemical traceability often involves batch numbers and origin records, building trust in both academic and industrial handling.
Manufacturers usually choose the Reimer-Tiemann reaction or related formylation methods, targeting phenol as a raw material to form the aldehyde group in the para position. In one classic route, phenol reacts with chloroform in a basic medium, placing the formyl group right where chemistry needs it. Efficient process design matters: optimizing yields, reducing chlorinated waste, maintaining strict pH, and safely capturing volatile byproducts. Using modern reactors and effective ventilation makes all the difference, both in production scale and worker safety.
Chemists love this molecule for its reactivity. The aldehyde group readily enters condensation reactions, creating Schiff bases or more complex heterocycles. The phenolic hydroxy group serves as a launch pad for ether, ester, or azo dye synthesis. Under oxidative conditions, that aldehyde converts to an acid; under reduction, it becomes an alcohol. Synthesis of vanillin owes a lot to the reactivity of P-Hydroxybenzaldehyde. Given the right conditions, subtle tweaks in substituents bring about analogs for bioactive compound development. I’ve witnessed creative grad students use this backbone to build novel ligands for metal chelation.
Ask five suppliers and get five names: 4-Hydroxybenzaldehyde, Para-Hydroxybenzaldehyde, 4-Formylphenol, or even p-Formylphenol. International catalogs might swap in numbers or local translations, but the structure never changes. Knowing all possible labels avoids order errors or dangerous mix-ups. In catalogs and on storage shelves, cross-checking identifiers (EC, CAS) can prevent more than one missed deadline or wasted batch.
Direct exposure to dust or vapor can irritate eyes, skin, and lungs. Chronic exposure—rare in tightly run labs—raises the risk of more serious health issues. Proper PPE means gloves, fitted goggles, and lab coats; fume hoods or extraction are non-negotiable. Mixing the compound into larger syntheses calls for strict procedural controls: slow addition rates, careful monitoring, continuous pH checks. If spills happen, vacuums equipped with HEPA filters minimize risk, and chemical neutralizers work better than routine mopping for aldehydes. In my old lab, emergency training covered not just response but recognition—smell, color, form—so no one worked blindly with these aromatic compounds.
Perfumers draw on p-Hydroxybenzaldehyde as a starting point for scents, especially for flower-inspired top notes. In the food world, companies transform it into vanillin, the benchmark for synthetic vanilla flavor. Dye manufacturers depend on it for creating vivid colors and stable pigment bases. Pharmaceuticals see this building block as essential for drugs targeting both infectious and chronic diseases, with modifications adding improved bioavailability or lower toxicity. Research teams still look at anti-microbial, anti-inflammatory, and anti-cancer edges based on this scaffold. Fine chemicals or advanced materials emerge from its simple but adaptable structure—semiconductors, sensors, even specialty polymers.
Universities and industry R&D labs look at new synthesis pathways aiming for lower environmental impact or improved selectivity, experimenting with catalysts, greener solvents, or microwave activation. Biotechnological advances turn to engineered microbes that could convert plant feedstocks—avoiding chlorinated reagents altogether. Computational chemists model its functional group reactivity, mapping unforeseen derivatives or biological activities. Published studies push the envelope in exploring modifying substituents or new applications in medical diagnostics, often reporting better yield or activity than traditional routes.
Animal studies suggest acute toxicity remains low, yet p-Hydroxybenzaldehyde does cause irritation with high or prolonged exposure. Metabolism inside the body produces conjugates excreted by the kidneys, but high doses might damage the liver or kidneys. Researchers measure the effects of breakdown products, documenting both safe use and warning thresholds. Environmental monitoring tracks persistence, showing moderate degradability but pointing to risks if released in large quantities. Labs engaged in novel drug development scrutinize its mutagenicity and allergen potential, acknowledging the gap between lab models and real-world exposures.
Factories face growing pressure to “green” their routes, so future demand will likely steer producers toward renewable feedstocks or enzyme catalysis. Drug discovery might push for analogs that outperform traditional antibiotics or anti-cancer agents. Better characterization tools could unlock new uses in advanced electronics or smart materials. As consumer markets demand more sustainable fragrances and food additives, companies willing to invest in clean production and full transparency will stand out. In the years ahead, expanded regulatory frameworks will raise the bar for safety and reporting, but also inspire creative R&D, since necessity often sparks the best breakthroughs.
P-Hydroxybenzaldehyde, also known as 4-hydroxybenzaldehyde, brings more to the table than its somewhat technical name might suggest. It carries the chemical formula C7H6O2 and is recognized for having a benzene ring with both an aldehyde and a hydroxy group in the para position. In plain language, this structure shapes its properties and uses, and it plays a notable role in both research and industry.
Sometimes, the specifics of a chemical formula seem like minutiae in a textbook, but there’s a good reason to care about details like C7H6O2. This formula determines not just what the compound can do, but where you might find it—in the lab, pharmacy, or even daily products like fragrances. The arrangement of atoms isn’t just academic trivia; it means p-hydroxybenzaldehyde can act as a building block for other important chemicals, such as vanillin, which gives vanilla its well-known aroma.
In my time working alongside chemists, I learned how formulas like C7H6O2 make or break a successful synthesis. If someone confuses p-hydroxybenzaldehyde with a similar-looking compound, there’s a real risk of wasted resources, failed experiments, or even safety hazards. This precision turns out to be a foundation for reliability in industries relying on organic molecules, such as pharmaceuticals or perfumery.
The compound shows up as more than just a molecule on paper. Its structure, dictated by the C7H6O2 formula, allows it to serve as a stepping stone in creating drugs with antibacterial or antioxidant properties. Researchers exploring better treatments for health conditions often lean on molecules like this during the early stages of discovery, using its reactive groups to attach or modify other parts of drug candidates.
And there’s more: p-hydroxybenzaldehyde’s presence in traditional herbal remedies, tea extracts, and flavor additives show its versatility. It doesn’t work alone—it needs the right chemical puzzle to unleash its benefits or to fit into a product formula. The aroma industry, for example, draws directly from nature and organic chemistry to deliver pleasant scents, and p-hydroxybenzaldehyde serves as a core ingredient in producing vanillin.
There’s a fine line between beneficial and risky use. P-hydroxybenzaldehyde, like many organic compounds, requires careful handling. It’s not the sort of substance to tinker with in a home kitchen. Whether in a lab or production plant, access to safety data sheets, proper training, and solid equipment proves indispensable for anyone using or synthesizing this compound. I’ve seen firsthand how a lapse in basic lab protocol can lead to unnecessary accidents or exposures.
Understanding what C7H6O2 stands for breaks down barriers between science and everyday life. People curious about what goes into their foods, medicines, or perfumes benefit from a clear grasp of chemical building blocks like p-hydroxybenzaldehyde. The practical value isn’t hidden in labs alone; it comes to life in the hands of educated professionals, responsible businesses, and even curious consumers willing to ask good questions. Keeping science approachable, accurate, and safe ensures that discoveries serve the whole community in the long run.
Most people have never heard of p-hydroxybenzaldehyde. If you worked in a lab or spent time making things from scratch—whether it’s soap, food flavors, or medicines—chances are you’ve crossed paths with chemicals that trace back to it. Across fields, this compound isn’t just another name on a safety datasheet, it’s a building block that shapes products millions of folks use every day.
One of the biggest jobs for p-hydroxybenzaldehyde comes through its role in the aroma of vanilla. Vanilla flavor, especially the kind that shows up in baking aisles and ice cream shops, usually doesn’t come from hand-pollinated orchids. The main source is vanillin, which comes straight from chemical routes—often using p-hydroxybenzaldehyde as a key ingredient. Companies transform it through chemical reactions so the vanilla taste can go on to flavor your pastries, drinks, and everything in between.
Perfume makers and fragrance formulators also rely on this compound. P-hydroxybenzaldehyde lets them create warm, deep notes, adding character to scents that would otherwise smell flat. These fragrances end up in daily use items, like soaps, lotions, and deodorants. The fact that products feel familiar and comforting often owes something to this behind-the-scenes ingredient.
Medicines don’t just appear on shelves—they are built up from small components. P-hydroxybenzaldehyde steps into several pharmaceutical syntheses, giving scientists options to create pain relievers, antiseptics, and even cancer drugs. With drug resistance issues growing and new illnesses showing up, the need for reliable, well-understood chemicals becomes urgent. Because it’s been studied for decades, its behavior is well mapped. That track record matters every time a chemist wants to invent or improve a lifesaving drug.
Colors in clothes and plastics often start their journey from molecules most of us don’t think about. Dye and polymer makers use compounds like p-hydroxybenzaldehyde to anchor complex structures, making shades brighter and more durable. Without it, artists and industry would struggle to create products that hold up in sunlight, water, or intense use. The same chemical principles let people produce plastics that last long without breaking and packaging that resists heat or moisture.
Every time you make or use something reactive, you face safety trade-offs. On the factory floor, handling p-hydroxybenzaldehyde calls for good ventilation, gloves, and education. Failing here puts workers at risk, so clear labeling and strong training aren’t optional. Regulators like the EPA track such substances, pushing manufacturers to curb emissions and avoid waste. In my own time working near lab benches, it always struck me that safety isn’t about paranoia—it’s about respect for the tools you have.
The world doesn’t just want more vanilla or better plastics; it wants cleaner ways to make them. Green chemistry approaches are cropping up, aiming for less harsh solvents and renewable starting materials. Scientists now explore biocatalysts—enzymes that coax p-hydroxybenzaldehyde into useful targets at lower temperatures and with less pollution. Companies investing in these cleaner tools can cut costs and improve worker safety. With pressure mounting from shoppers and regulators alike, the odds look good that these better ways will soon take root.
P-Hydroxybenzaldehyde gets its name from the world of organic chemistry. Commonly used in the production of certain dyes and flavors, this substance has found its way into manufacturing labs and some specialty industrial processes. Anyone working in a chemistry or research setting will recognize its penetrating almond-like scent. Chemists use it as a building block for more complicated molecules that end up in pharmaceuticals and food additives.
A lot of chemicals carry risks, and P-Hydroxybenzaldehyde is no exception. Published toxicity data reveals that this compound brings some real dangers. Acute exposure results can include skin and eye irritation. Breathing in its dust or vapor may cause coughing or respiratory discomfort. Swallowing it can floor the stomach, with a risk of nausea or vomiting.
P-Hydroxybenzaldehyde is not famous for turning up in everyday products at high concentrations, but laboratories and industrial plants see much higher volumes. Long-term exposure in those places might lead to liver issues or kidney stress, at least as demonstrated in some animal studies. There’s no extensive dossier linking it with cancer in humans, yet toxicologists caution that too much exposure isn’t wise. The International Agency for Research on Cancer has not set a clear classification, which adds to the uncertainty. Personally, I treat anything with a warning label with extra care, which is a lesson you learn after handling lab solvents for years on end.
People not working at a chemical plant or university lab will probably never handle this material. Even so, the possibility of environmental exposure from plant discharges or accidents can’t be ignored. Improper storage or disposal of chemicals like P-Hydroxybenzaldehyde can contaminate water and soil. In my undergraduate days, I remember an entire class debating whether a minor chemical spill in a university lab might threaten the campus drinking water — a great lesson in chemical stewardship.
Workplaces with P-Hydroxybenzaldehyde should rely on robust safety protocols. Splash goggles, gloves, and fume hoods become important, since the stuff causes irritation in concentrations that might seem trivial at first. In college, we never set foot in the lab without reviewing the safety data sheets. Any place handling chemicals should also take disposal seriously; dumping organic compounds down the drain is out of the question. A lot of young researchers start out thinking that colored liquids look harmless. You only need one bad reaction — a sneezing fit, a stinging hand — to realize that lab protocol protects everyone.
Most chemical incidents come down to human error or oversight. Regular training, clear labeling, and never cutting corners goes a long way. Regulatory agencies like OSHA and the EPA track and set control measures for laboratory and industrial chemicals. Greater transparency helps communities know what risks exist in local manufacturing. If companies made public their inventories and safety plans, small accidents wouldn’t spiral into headlines. In the future, stricter rules around reporting exposures to substances like P-Hydroxybenzaldehyde would add another layer of safety for workers and residents alike.
P-Hydroxybenzaldehyde shows up in labs and factories that work with specialty chemicals or intermediates for flavors and pharmaceuticals. It’s not a household name, but keeping it safe on the shelf matters. If you’ve ever worked in a research setting or around a chemical storeroom, you know small oversights can lead to big headaches. Let’s get into what helps this chemical stay stable and why proper care keeps both product and people out of trouble.
You won’t find p-hydroxybenzaldehyde in kitchen cupboards. It goes into its own space, away from sunlight and steady drafts. Light and air don’t treat aromatic aldehydes well. Over time, exposure brings out discoloration or unwanted reactions with moisture.
A tight seal on its original container works best. This means using glass or high-density polyethylene that keeps out oxygen and humidity. Don’t trust older containers with cracks, as even tiny leaks let moisture creep in and spoil what’s inside. It’s not about paranoia—it’s about saving time, money, and sometimes jobs down the road.
Cool, dry storage tops the list of advice from technical bulletins. Typical room temperature won’t hurt the compound, but if you can keep it at 15 to 25°C, that slows down any slow burn of degradation. Turning up the AC isn’t always practical in hot climates, so a dedicated cabinet or climate-controlled storage room pays off over the years.
Hands-on work changes the equation. I’ve seen cases where someone skipped gloves or goggles, thinking a quick transfer would be fine. But aromatic aldehydes, including this one, cause irritation to the eyes and skin, especially in concentrated form. It doesn’t pay to take shortcuts. Good gloves, snug goggles, and a lab coat put a buffer between you and chemical splashes.
Ventilation never gets enough appreciation. If you’re weighing out p-hydroxybenzaldehyde or making dilutions, do it in a fume hood. Inhalation shouldn’t be an afterthought, because vapor builds up and can sneak past basic nose checks until irritation starts. Accidents are rare with basic discipline—a label on the bottle, a reminder on the shelf, and a quick check before using.
Training new lab members pays dividends. Walk them through a storage area and explain which bottles need special care. Go over what to do with spills. Not every facility invests in regular safety refreshers, but those that do have fewer mishaps and less waste.
In labs I’ve seen, secondary containment bins keep bottles upright and catch leaks. Signage reminds folks to keep incompatible chemicals apart—oxidizing agents have done enough damage in labs without another close call. Never store large amounts if you don’t go through stock quickly. Order only what gets used within a few months and rotate older stock up front so nothing lingers forgotten in the corner.
Waste disposal calls for careful labeling and locked containers. Don’t pour leftovers down the drain. Use a dedicated waste stream for aromatic organics. Call the disposal team before anything piles up. This keeps local water safe and avoids fines down the road.
Cutting corners on storage and handling causes more harm than many realize. Proper treatment of p-hydroxybenzaldehyde keeps purity high and reduces health risks. Replacing spoiled chemical stock is expensive, and dealing with chemical exposure cases takes attention away from better things in the lab. Adopting the right habits saves money and makes the workspace safer. Most mishaps trace back to ignored basic principles, not rare disasters. Staying patient, labeling clearly, and showing respect for every substance pays back for years.
P-Hydroxybenzaldehyde pulls a lot of weight in labs and factories. Purity isn’t some footnote; it’s the key concern for labs running delicate reactions, pharmaceutical producers, and anyone chasing reliable data. Most manufacturers offer it in a few standard grades. The purest offerings land at 99% or higher, sometimes labeled as “analytical” or “reagent” grade. That 1% gap between 98% and 99% purity may sound tiny, but hidden contaminants can throw off experiments, especially in biotech or pharma, where impurities could trigger side reactions or spoil the end product.
For those working in research, 99% purity takes the guesswork out of analysis. High-purity P-Hydroxybenzaldehyde means less background noise in chromatography readings, fewer hiccups in synthesis, and more reproducible data. You don’t want compounds with fuzzy backgrounds if you’re tracing down a new pathway in organic chemistry or formulating a novel drug.
Some users still work with technical or industrial grades, which may hover between 96% to 98% purity. These batches might carry more color or trace solvents. Not every industry needs prime cuts—technical grade works in making flavors, fragrances, or dyes where final products tolerate a small impurity load. For me, seeing conflicting results between lots early in my lab days traced right back to batch-to-batch differences in purity; those situations eat up time and budget fast.
P-Hydroxybenzaldehyde usually shows up in a range of containers, and the size you choose really affects workflow and cost. Smaller bottles, like 25g or 100g amber glass, work well in research benches or quality assurance labs. The glass keeps moisture and light out, so the chemical remains stable across repeated uses. Upgrading to 500g or 1kg glass bottles makes sense for semi-pilot work or small production lines—handling and storage still stay manageable, but you waste less packaging material than when buying a stack of tiny bottles.
Bigger producers and industrial users lean toward plastic drums or steel containers, stretching from 5kg up to as much as 25kg per container. At this level, safe transfer and storage become bigger headaches. Even a minor spill or cross-contamination issue blows up fast when you handle chemicals by the drum. I’ve seen production runs stall because packaging—cracked containers, poor seals, or contamination—wasn’t fit for purpose. Suppliers who know how to factor in chemical compatibility and ease of transfer really cut logistics headaches for teams working at scale.
Making smart packaging choices even reduces downstream waste for disposal. Returnable drums, recyclable plastics, and tamper-evident seals all play bigger roles as regulations tighten and end users factor in environmental scorecards. People managing warehouse inventories or procurement say paying up for better packaging pays off in less product loss and fewer emergencies.
With tighter global regulations and competitive pressure, suppliers improve both purity standards and packaging designs. Some companies offer stability data, safety certifications, and material traceability as part of the sale. Users should push for proof of batch analysis—showing actual purity levels and contaminant screens— before buying, since not every label matches the drum’s contents. I’ve learned the hard way that skipping this step ends up with unexpected downtime and costly delays.
In the end, there isn’t one ideal answer for every user. The trick lies in understanding the impact of purity levels on the work at hand, knowing what packaging streamlines your own workflow, and looking for partnerships with suppliers who support transparency. Getting those three things right pays off with consistent results and fewer headaches—both in the lab and on the shop floor.
| Names | |
| Preferred IUPAC name | 4-Hydroxybenzaldehyde |
| Other names |
4-Hydroxybenzaldehyde p-Formylphenol p-Benzaldehyde p-Oxybenzaldehyde p-Hydroxybenzenecarbaldehyde |
| Pronunciation | /paɪˌhɑːdrɒksiˌbɛnˈzældəˌhaɪd/ |
| Identifiers | |
| CAS Number | 123-08-0 |
| Beilstein Reference | 1208733 |
| ChEBI | CHEBI:17654 |
| ChEMBL | CHEMBL15912 |
| ChemSpider | 7198 |
| DrugBank | DB04202 |
| ECHA InfoCard | 03933b07-1c92-43b7-b12c-08fa68e4ca2f |
| EC Number | 203-318-5 |
| Gmelin Reference | 82244 |
| KEGG | C01745 |
| MeSH | D006943 |
| PubChem CID | 6989 |
| RTECS number | DH6650000 |
| UNII | 9QJ3MF8H6W |
| UN number | UN2811 |
| CompTox Dashboard (EPA) | 'DTXSID4039535' |
| Properties | |
| Chemical formula | C7H6O2 |
| Molar mass | 122.12 g/mol |
| Appearance | White to pale yellow crystalline powder |
| Odor | almond-like |
| Density | 1.28 g/cm³ |
| Solubility in water | Slightly soluble |
| log P | 1.58 |
| Vapor pressure | 0.0000415 mmHg at 25°C |
| Acidity (pKa) | 7.8 |
| Basicity (pKb) | 7.89 |
| Magnetic susceptibility (χ) | -59.8×10⁻⁶ cm³/mol |
| Refractive index (nD) | 1.627 |
| Viscosity | 13 cP (80°C) |
| Dipole moment | 2.72 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 108.6 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -161.0 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -1072.5 kJ/mol |
| Hazards | |
| Main hazards | Harmful if swallowed, causes serious eye irritation, causes skin irritation |
| GHS labelling | GHS02, GHS07 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | H302, H315, H319, H335 |
| Precautionary statements | P280, P305+P351+P338, P310 |
| Flash point | 145°C |
| Autoignition temperature | 548°C |
| Lethal dose or concentration | LD50 oral rat 2200 mg/kg |
| LD50 (median dose) | LD50 (median dose): Oral-rat LD50: 2200 mg/kg |
| NIOSH | SN4200000 |
| PEL (Permissible) | Not established |
| REL (Recommended) | 50 mg |
