© 2026 Nanjing Finechem Holdings Co., Ltd,
All Right Reserved
Curiosity drives the journey of 3-methylpyridine, sometimes known as 3-picoline, through the last two centuries. Chemists first puzzled over its properties after discovering pyridine’s numerous isomers in coal tar distillates. In my own years among scientists who love to dig into chemical histories, I’ve seen how 3-methylpyridine often fell out of the limelight compared to its siblings, but its vital role kept it on every synthetic chemist’s shelves. Decades ago, folks extracted it in small batches from natural tar. Once synthetic routes matured, industrial-scale production flourished. This steady shift from natural isolation to made-to-order chemical production symbolizes the evolution in organic chemistry—a discipline always blending curiosity and necessity.
Ask any chemist working in pharmaceuticals, agriculture, or materials what small nitrogen-containing heterocycles they rely on, and 3-methylpyridine will rank high on the list. Its structure—a simple pyridine ring with a methyl group attached to the third carbon—affects reactivity in ways that make it fit hand-in-glove with various transformations. In my own experience, its characteristic sharp, slightly fishy odor lingers longer than most people find pleasant. Still, those with a nose for chemistry know it signals both potency and opportunity. Its chemical fingerprint brings consistency for labs focusing on flavoring agents, agrochemical intermediates, and pharmaceutical research. Despite rival compounds clamoring for attention, 3-methylpyridine keeps its uses broad and utility high.
This compound typically appears as a clear, colorless to pale yellow liquid at room temperature, easy to spot among the glass bottles in a well-stocked laboratory. With a melting point just below the freezing point of water and a boiling point well above it, 3-methylpyridine stays liquid under most normal working conditions. The density clocks in slightly lower than water, so spills float. That familiar acrid smell makes itself known even at low concentration—the kind of warning nature built in for its own safety. As for solubility, it dissolves readily in water and mixes easily with alcohols, ethers, and most common organic solvents. The methyl group tweaks both polarity and basicity, shifting its chemistry from plain pyridine and giving chemists options when planning a reaction.
Quality matters in every industry, and chemical purity standards remain no exception. Producers offer 3-methylpyridine in grades tailored for industrial, laboratory, or pharmaceutical use. Purity regularly exceeds 98%, and any reputable supplier provides certificates of analysis detailing water content, impurity levels, and physical constants. Federal and international labeling guidelines require handling and hazard warnings, chemical identification numbers, and usage recommendations. From years in R&D, I’ve learned that proper labeling and specification checks save not just time, but sometimes lives—one mislabeling in a hurry can ruin a batch or worse. Rigorous oversight on packaging remains the norm, reflecting a collective awareness of both chemical potential and risk.
No longer do chemists rely on coal tar distillation for reliable supply—modern synthesis leans on catalytic reactions and tuning conditions to maximize yield. Dehydrogenation of 3-methylpiperidine or cyclization reactions involving acrolein and ammonia frequently headline commercial routes. Over time, process engineers shifted to catalysts based on metals like molybdenum or vanadium, devising ways to push efficiency up and waste down. In my own time at chemical plants, I’ve seen researchers wrangling with reaction temperature, catalyst life, and feed ratios, eyeing both economics and environmental stewardship. Cleaner methods, less byproduct, and better yields: that’s what separates today’s refined production from the crude processes of the past.
3-methylpyridine’s utility hinges on its approachable chemistry. The nitrogen atom’s lone pair sits ready for protonation, quaternization, and complex formation. The methyl group, though small, activates the ring toward substitution and oxidation. Chemists use it to launch syntheses for compounds like nicotinic acid, herbicides, drugs, or specialty polymers. Functional group manipulations—the bread and butter of organic synthesis—move smoothly here. Chlorination, nitration, sulfonation, and oxidation pathways all proceed under well-established conditions, giving research teams a flexible building block for target molecules. Years of bench work teach that starting from a versatile core like 3-methylpyridine streamlines discovery and scale-up alike.
Language drifts in laboratories, and names accumulate with time. 3-methylpyridine sits in catalogs as 3-picoline, β-picoline, or sometimes simply methylpyridine. Flip through product listings and the synonyms all point to the same molecular identity. Standardizing chemical nomenclature balances tradition with clarity. Professional societies and global trade organizations push consistency so scientists everywhere know they’re speaking the same language, even if local names linger.
Anyone who handles volatile pyridines knows not to cut corners on safety. 3-methylpyridine brings clear hazards—irritation to skin, eyes, and respiratory passages ranks high, and improper storage raises longer-term health risks. Fume hoods, gloves, and goggles form the baseline kit for anyone working with this substance. Safety data emphasizes quick spill containment, good ventilation, and waste management that keeps the compound out of drains and soils. In chemical manufacturing settings, regular training and audits make a difference in preventing accidents. Clear rules, frequent reinforcement, and a culture that puts safety before speed keep both people and the environment protected.
Look at where 3-methylpyridine ends up and you’ll find no shortage of uses that get beyond chemical trivia. The pharmaceutical sector counts on this compound for making drugs that fight infections or regulate metabolism. Agrochemicals draw on its chemistry for products that control weeds, pests, and plant diseases. Flavor and fragrance industries dip into its reactivity for synthetic flavors or as intermediates to craft complex scents, though stricter scrutiny has crept in due to safety concerns. In specialty materials, 3-methylpyridine sometimes paves the way for advanced polymers, surfactants, and corrosion inhibitors. Over my years surveying chemical markets, its presence forms the backbone for new products aiming to solve real-world problems.
Chemists thrive on the hunt for better, safer, more sustainable chemical routes. Research with 3-methylpyridine focuses on greener catalytic systems, less hazardous reagents, and applications that minimize environmental footprint. In academic labs, new modifications to its ring structure offer promising leads for pharmaceuticals or materials. I’ve watched teams chase after the next breakthrough antimalarial or fungicide, running hundreds of variants based on the 3-methylpyridine scaffold. Industrial partners measure progress in tons-per-year and cost-per-kilo, never losing sight of both end use and broader societal impact.
Anyone working in toxicology knows that every benefit in chemistry has a trade-off. Studies have shown that 3-methylpyridine poses moderate toxicity to mammals, and repeated exposure impacts organs like the liver and kidney. Inhalation and skin absorption carry risks, and even small leaks can hit aquatic species hard. Regulatory agencies in the US, EU, and Asia tightly control workplace limits and environmental emissions for this class of compounds. Toxicologists constantly reassess safe levels as new data emerges—sometimes nudging limits tighter, always pushing to reduce accidental exposures. Lessons from past missteps in chemical industry management underscore why responsible handling matters so much.
Progress in chemical manufacturing keeps shifting the outlook for compounds like 3-methylpyridine. Interest in bio-based raw materials and closed-loop production could soon cut waste and green up existing processes. Research keeps peeling back layers of its reactivity, opening up new doors in drug discovery or specialty chemicals. Tighter regulations may trim use in some applications, but innovation and adaptation consistently reshape chemical value chains. Those following developments see opportunities in renewable feedstocks, catalytic recycling, or even precision medicine using pyridine-based drugs. For now, the compound stands as a workhorse—but its best chapters may be still to come as science and industry sharpen their focus on sustainability and health.
3-Methylpyridine stands out in the world of chemicals for both its versatility and the impact it has on a lot of everyday products, though it rarely gets any spotlight. Over my years of following industry trends and looking closer at the chemicals beneath the surface, I’ve learned that tiny tweaks to molecules—like adding a methyl group to pyridine—can open the door to whole new uses. This particular compound forms a backbone for all sorts of manufacturing processes and finished goods, many of which play a bigger role in our lives and health than most people realize.
The agriculture sector depends on 3-Methylpyridine for producing important crop protection products. Many fungicides and herbicides trace back to this compound during synthesis, especially those used on staple crops like corn and soybeans. I’ve met growers who rely on these chemical agents to hold off blights that could easily wipe out harvests worth millions of dollars. This use ties directly to global food stability, influencing both yield and the economic wellbeing of farming communities. The safety and environmental concerns get a lot of research attention. Makers strive to balance how much is applied in the field with how quickly it breaks down in soil, and regulatory oversight ensures the benefits outweigh the risks.
Walking through any pharmacy, it's clear that medical science stands on the shoulders of past chemists. Several important medications contain pieces of the 3-Methylpyridine molecule. This includes treatments for high blood pressure, mental health conditions, and even tuberculosis. The compound acts like a springboard for creating molecules uniquely suited to fighting certain diseases or relieving pain. Drug makers spend years sifting through thousands of compounds for a handful that actually make their way to pharmacy shelves, but 3-Methylpyridine has carved out a spot in this search thanks to its chemical stability and ability to bond in many ways.
If you’ve seen niacin or Vitamin B3 listed on a cereal box or supplement bottle, chances are it started with a chemical relative of 3-Methylpyridine. The food industry counts on this link because synthesizing vitamins in a lab lets producers guarantee purity and keep costs down. Malnutrition and vitamin deficiencies still affect people across the globe. Lab-made vitamins, grounded in compounds like 3-Methylpyridine, help bridge this gap. Making sure production stays safe and environmentally responsible has become a larger focus, especially with stricter food regulations in major markets.
Automobiles, medical devices, and industrial machinery all rely on certain types of rubber with custom features. Some of those additives originate from 3-Methylpyridine. This compound goes into antioxidant and antiozonant agents that shield rubber parts from cracking or breaking down. It's also used to make specialty solvents, especially those that need to handle tough conditions during chemical reactions. Engineers, including some in my own family, have mentioned how much smoother their job gets with high-quality rubber and reliable solvents.
The uses for 3-Methylpyridine offer real benefits—health improvements, better crops, safer products—but nothing comes without responsibility. Producers now face closer scrutiny of air emissions and waste streams. Tighter manufacturing controls, along with worker safety training and waste-reduction tech, help keep these risks manageable. Gaps still exist, mostly in older facilities or regions where oversight lags, but the direction of progress points toward safer and more sustainable chemical use.
3-Methylpyridine, or beta-picoline to those who have encountered it professionally, pops up mostly in chemical manufacturing, agriculture, and sometimes in pharmaceutical labs. Its pungent, sharp odor is enough to remind anyone handling it to keep the exposure minimal and gear up with proper protection. Years ago, during a summer stint in a flavor compounding facility, I saw firsthand how workers respected the need for vigilance around this chemical, and it left a strong impression.
The main concern with 3-Methylpyridine comes from inhalation and skin contact. Short-term exposure often leads to irritation of the eyes, throat, and nose. Those who accidentally splash it on their skin notice redness or even a burning sensation, which tells you right away that this isn’t something to brush off. Breathing in its vapor can make people queasy or dizzy; on rough days, headaches and nausea turn up, making it hard to get any real work done without worrying about long-term effects.
Persistently working around 3-Methylpyridine without proper ventilation—especially in crowded or outdated labs—brings up deeper concerns. Studies in animals point to liver and kidney damage when exposed at high doses over weeks. Researchers at the National Institute for Occupational Safety and Health (NIOSH) highlight animal research linking chronic exposure to blood abnormalities and liver swelling. Though humans tend to dodge such extremes by following safety standards, this evidence argues for never getting complacent.
There’s yet to be definitive proof linking beta-picoline to cancer in people. The International Agency for Research on Cancer (IARC) hasn’t classified it under rigorous carcinogen categories. Still, repeated, low-level exposure to volatile organic compounds, in general, leaves a lot of unknowns—something toxicologists stress during site visits. Precaution matters because it’s impossible to reverse certain forms of damage.
The best way to keep problems at bay starts with respect for safety guidelines. From fumbling through my own first attempts to put on snug goggles and gloves at a crowded plant, I learned nobody likes to deal with rashes or coughing spells. Industry standards recommend eye protection, nitrile gloves, and regular checks on air filtration systems. Those who skip even a single step often regret it—one coworker ignored a small spill, and after a week had to miss shifts because of a chemical burn.
Managers can invest in better air handling systems and routine hazard reviews. Laminated safety sheets posted near benches help, since reminders make a real difference in high-pressure situations. Training newcomers thoroughly and encouraging open discussion about possible symptoms keeps everyone alert. Dismissing early warning signs doesn’t just mean discomfort—it could threaten someone’s long-term quality of life.
Industries should keep searching for safer alternatives when possible. Some modern labs now test green solvents and use less volatile chemicals to cut down on health risks and environmental impact. Pushing for more research on long-term effects in people helps close the information gap. Health authorities can support this work by setting stricter safety limits based on new data, not just animal tests from decades ago.
People working with 3-Methylpyridine deserve straightforward information, honest communication about hazards, and real opportunities to speak up if conditions get tough. Companies benefit from healthier workers who feel confident in their environment, reducing turnover and sick days. Nothing substitutes for good training and attentive care, especially with chemicals whose full stories aren’t yet written.
3-Methylpyridine stands out as one of those molecules that chemists can spot on sight. Its structure throws a small twist on the well-known pyridine ring. Take the classic six-member pyridine ring—five carbon atoms and a single nitrogen in the ring. Stick a methyl group (a CH₃) onto the carbon in the number three spot, counting counter-clockwise from the nitrogen. That’s where 3-methylpyridine gets both its name and many of its chemical habits.
Diving in with a pen and paper, you’d sketch 3-methylpyridine as a hexagon with one corner as a nitrogen. On the carbon two places to the side, you’d jot a short line to a three-hydrogen chain. To spell it out for the chemistry crowd, the formula goes C6H7N, or to be fancier, CH3–C5H4N. The methyl group crowds one side, shifting how the molecule reacts, smells, and dissolves.
In real-world labs, the placement of that lone methyl group wholly changes the game. To draw from my experience working around specialty chemicals, folks soon find that moving even one atom in a molecule transforms how factories and researchers treat it. 3-Methylpyridine takes this lesson to heart. Unlike its cousin 2-methylpyridine, placing the methyl on the third carbon relieves some strain on the ring, which changes its boiling point and shifts its uses. That small rearrangement gives the compound a sharper, smoky smell and sets it apart from both pyridine and any other methylpyridines.
Chemists in the industry lean on 3-methylpyridine for making vitamin B3, pesticides, and certain specialty solvents. Why pick this version over others? It starts with that structure—reacting more gently, tolerating a wider range of conditions, and dissolving well in many organic phases. Over the years, I’ve seen how a simple methyl can steer the path from raw oil-derived materials to life-saving vitamins or next-generation crop chemicals.
No honest take on a chemical should ignore its risks. 3-Methylpyridine’s small, volatile structure means it evaporates fast. Without careful ventilation, it can knock out your sense of smell after a short exposure. Its toxicity demands gloves in the lab and strong air handling in factories, not just for workers, but for environmental health. Companies handling this chemical went through years of tightening up workplace limits on airborne concentrations, sticking to data uncovered in animal studies. Regulatory circles watch its production closely. Data from the European Chemicals Agency and the US National Library of Medicine both place it on lists for routine risk assessment because the molecule can pose chronic hazards when mishandled.
Plenty is known about safe work around compounds like 3-methylpyridine. Industry leaders use closed systems to prevent leaks, lean on gas scrubbers, and reinforce worker routines with regular training. In my own time managing chemical inventories, nothing beat good labeling and double-checking seals. The chemistry world needs steady research on substitutes or add-on purification steps that reduce the need for such irritants. For now, though, every time that methyl group meets a reaction flask, respect for its unique structure and risks stays front and center for anyone working behind the scenes.
I’ve handled plenty of odd-smelling liquids and powders in research labs. Few things make you appreciate good storage like a strong whiff of something potent. 3-Methylpyridine brings that signature, biting aroma and a reputation for being tricky. Headlines rarely touch on lab shelf safety, yet accidents often begin with a poorly sealed bottle or vapor sneaking out. For chemicals like this, small steps keep workspaces safe and investments intact.
Leakproof containers make all the difference. In my experience, a cheap lid or cracked gasket brings endless regret. Always go with tightly sealing glass bottles. This chemical can eat its way out of some plastics, so reputable suppliers usually ship it in amber glass. Light breaks down pyridine rings quicker than most folks expect. A dark, cool spot keeps the stuff fresher and curbs pressure inside the bottle.
Try to store it away from sunlight and hot spaces. Years ago, I watched a summer sunbeam turn a clear flask murky yellow, then brown. Ultraviolet light spikes the energy in those rings, kicking off reactions that wreck purity—and build up weird, sometimes dangerous side products.
3-Methylpyridine doesn’t freeze on a winter morning, so it gets left out more often than some other chemicals. I’ve made this mistake. Letting the bottle sit above room temperature builds vapor pressure fast. Fume cabinets and dedicated flammable storage fridges both solve this problem. A chill, steady temperature stops extra vapors, which cause leaks or, worse, accidents from built-up fumes. Not every lab budgets for top-of-the-line fridges, but a simple explosion-proof refrigerator pays for itself in peace of mind.
Many bottles get a single hand-written sticker and collect dust. Never worked for me. Permanent labels stating full name, date of receipt, and hazard data cut confusion. Emergency responders use these details when minutes matter. OSHA has rules on secondary container labeling, and most places enforce them for good reason. My old chemistry professor once told me that words save more lives than any piece of gear on the shelf.
People sometimes stack whatever fits into a crowded cabinet, hoping for the best. 3-Methylpyridine fights with oxidizers and acids. Mix-ups happen fast in busy spaces. Dedicated shelves for amines (or at least a solid divider) avoid drama. Spills or leaks next to strong acids trigger violent reactions. Years back, our building cleared out for half a day when a bottle toppled in a shared fridge. Smoke, alarms, evacuations—the whole scene over ten seconds of inattention.
I’ve seen safety measures work and fail. Laboratories with regular training catch small errors before they become disasters. Make storage rules part of every new hire’s first week. It’s easy to skip, but nothing beats ten minutes on what goes where and why. This attention stops lapses in busy seasons or late-night runs when mistakes love to slip through.
Even perfect storage runs out of time. Expired bottles should join hazardous waste pickups, not general trash. Local regulations spell out disposal steps—follow them, or risk fines and bigger hazards. Strong municipal programs help teams keep pace with changing requirements and new discoveries about chemical safety. If in doubt, ask the waste officer—no one ever regrets checking twice before tossing a suspicious drum.
Anyone dealing with 3-Methylpyridine knows the talk always circles back to purity. This isn’t just lab jargon—those purity numbers affect everything from worker safety to the final outcome of a chemical reaction. Typically, the chemical comes with a purity of 98% or 99%, though some specialty batches push that up a notch. A spec sheet will often highlight water content below 0.2%, combined isomer content well under 1%, and minimal traces of things like 2-methylpyridine and 4-methylpyridine. By-products tend to be tightly controlled, since they can throw off research or production.
Over years of watching batches move from suppliers to the lab, the difference between 98% and 99% doesn’t look like much on paper. In practice, that last decimal can make or break experiments. Imagine a batch contaminated with a touch too much water or a related pyridine isomer—reactions slow, yields drop, people waste time chasing down the glitch. More than once, I’ve found myself checking GC-MS reports alongside colleagues, running down every impurity when something feels off.
Stories about poorly specified chemicals hit closest to home when safety is on the line. Funky batches with off-spec impurities do more than mess up products—they can trigger corrosive byproducts or put rare toxins in the mix. That’s why most responsible suppliers spell out not only the main purity but also limits for water, non-volatile content, and specific breakdown products. Reliable certificates of analysis help everyone breathe easier.
The best labs I’ve worked in always set their own checks for incoming stock. Sometimes, a bottle arrives showing 99% purity, but those hidden 1% impurities matter a lot. Chronic exposure to stray methylpyridine isomers means dealing with extra ventilation, gloves, and clean-up. Nobody wants to put a coworker at risk over a few missed details.
Trust between buyers and suppliers counts for plenty in this business. Still, it’s easy to fall into habits, assuming the spec from a supplier last year matches today's batch. Any time jobs depend on predictable results—pharmaceuticals, agriculture, electronics—regular independent testing is non-negotiable. In a couple of roles, we actually set up verification tiers: spot checks on random shipments, plus stricter scrutiny for new lots. That kept everyone honest, and it caught more than one batch that might have slipped through with an incorrect label.
Recent pushes from international authorities highlight purity as more than just a technical concern—it ties directly into regulatory compliance and environmental responsibility. Substances with 3-methylpyridine above 99% purity and below 0.1% water tend to slide through audits more easily and raise fewer flags during inspections. Tight specs mean fewer surprises all around.
Anyone handling 3-methylpyridine finds they can’t walk away from specification sheets or ignore supplier communication. Buying based on price alone often means paying double with headaches, retesting, or ruined batches. In my experience, taking a few extra minutes to review a supplier’s analysis saves hours of troubleshooting downstream. New labs that invest in better training and make every chemist aware of what’s in their reagents build a culture of safety and reliability.
Purity specifications for 3-methylpyridine might seem like dry numbers until you watch a reaction fail because of an overlooked trace impurity. Staying vigilant with sourcing, testing, and recordkeeping does more than keep chemistry on track—it builds a stronger foundation for safer, better results every time.
| Names | |
| Preferred IUPAC name | 3-Methylpyridine |
| Other names |
3-Picoline β-Picoline beta-Picoline 3-Methylpyridine |
| Pronunciation | /ˌθriːˌmɛθɪl.pɪˈrɪdiːn/ |
| Identifiers | |
| CAS Number | 108-99-6 |
| Beilstein Reference | 0110695 |
| ChEBI | CHEBI:28485 |
| ChEMBL | CHEMBL1407 |
| ChemSpider | 6823 |
| DrugBank | DB02160 |
| ECHA InfoCard | The ECHA InfoCard of product '3-Methylpyridine' is **"100.003.129"**. |
| EC Number | 203-604-4 |
| Gmelin Reference | 492016 |
| KEGG | C02327 |
| MeSH | D010014 |
| PubChem CID | 10460 |
| RTECS number | UJ1050000 |
| UNII | 6IV7Y09YUY |
| UN number | UN1236 |
| Properties | |
| Chemical formula | C6H7N |
| Molar mass | 93.13 g/mol |
| Appearance | Colorless to yellow liquid |
| Odor | Pyridine-like |
| Density | 1.031 g/cm³ |
| Solubility in water | Miscible |
| log P | 0.82 |
| Vapor pressure | 2.7 kPa (at 20 °C) |
| Acidity (pKa) | 5.68 |
| Basicity (pKb) | 5.80 |
| Magnetic susceptibility (χ) | -47.6·10⁻⁶ cm³/mol |
| Refractive index (nD) | 1.506 |
| Viscosity | 0.896 mPa·s (at 20 °C) |
| Dipole moment | 1.57 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 163.1 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | 97.3 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -4060 kJ·mol⁻¹ |
| Hazards | |
| GHS labelling | GHS02, GHS07 |
| Pictograms | GHS02,GHS07 |
| Signal word | Warning |
| Hazard statements | H301, H311, H331, H302, H312, H332, H314, H319, H335 |
| Precautionary statements | P210, P260, P280, P301+P312, P304+P340, P305+P351+P338, P312 |
| NFPA 704 (fire diamond) | 2-3-0 |
| Flash point | 86 °C |
| Autoignition temperature | 571 °C |
| Explosive limits | 1.3% - 11% |
| Lethal dose or concentration | LD50 oral rat 400 mg/kg |
| LD50 (median dose) | LD50 (median dose): Oral rat LD50 = 290 mg/kg |
| NIOSH | SN 4550000 |
| PEL (Permissible) | PEL (Permissible Exposure Limit) of 3-Methylpyridine: 2 ppm (7 mg/m³) |
| REL (Recommended) | REL (Recommended): 0.5 ppm |
| IDLH (Immediate danger) | 60 ppm |
| Related compounds | |
| Related compounds |
2-Methylpyridine 4-Methylpyridine Pyridine 2,6-Lutidine 2,4,6-Collidine |
