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The story of trans-2-dodecenal stretches back to the curiosity of natural product chemists who wanted to understand the scents and flavors found in plants, fruits, and seeds. Chemists have extracted, identified, and tracked this compound from coriander, cilantro, and even citrus peels as far back as the twentieth century. People often don’t realize how flavors and fragrances have driven chemical research for generations, with analytical tools like gas chromatography-mass spectrometry opening doors for scientists to spot molecules such as trans-2-dodecenal in trace amounts that matter profoundly in food and fragrance science. As laboratories kept pushing forward, isolation and synthesis of these aldehydes became a key focus, making way for their use in both industry and academia. This journey shows how small organic molecules discovered in nature can leap from plant leaves or seeds to the center of chemical research.
Trans-2-dodecenal belongs to the family of unsaturated aliphatic aldehydes. It brings a fresh, sometimes waxy and citrusy scent that has made it attractive for use in natural flavors and fragrances. Its presence in coriander seed oil or in certain citrus varieties illustrates how a single molecule can dramatically shift sensory experience—delivering flavor and fragrance notes that become signatures of food and perfumery. This simple point about an aldehyde’s impact helps illustrate the blend of chemistry and sensory experience that shapes so many choices we make as consumers, whether at the dinner table or in a cosmetics aisle.
Trans-2-dodecenal typically forms as a colorless to pale yellow liquid at room temperature. It holds a molecular formula of C12H22O, with a slight oily texture and a low to moderate boiling point. Its double bond, tucked away at the second carbon position, brings chemical interest and reactivity—transforming selectivity in reactions compared to fully saturated aldehydes. Its density and solubility line up with other mid-chain aldehydes, relying on hydrocarbon bulk for its hydrophobic traits, but that oxygen marker at the end ensures some reactivity with bases, acids, or nucleophiles. A potent aroma signals caution: sensory thresholds sit low enough that even minor concentrations can be detected by human noses.
Companies handling trans-2-dodecenal tend to track purity via gas chromatography for batch certification. Purity sits above 95 percent for most commercial and research needs, and impurities—often positional isomers or saturated side products—require tight control. Standard labeling references both the IUPAC name and common synonyms, noting concentration and potential hazards per regulatory bodies. Labeling also includes proper hazard pictograms emphasizing skin and eye irritation potential; detailed information keeps handlers informed without adding confusion. In regulated sectors, clear technical specs avoid any slip-ups during transportation, storage, or in practical use.
Lab synthesis of trans-2-dodecenal leans on a well-mapped toolkit of organic chemistry. One approach uses partial oxidation of the corresponding alcohol, 2-dodecen-1-ol, with controlled reagents to avoid over-oxidation or isomerization of the trans double bond. Another approach relies on cross-metathesis or Wittig reactions, building the molecule from shorter aldehydes or alkenes with protective group strategies to keep the right geometry intact. Extraction routes begin with essential oil distillation from coriander or other natural sources, followed by fractional distillation and chromatographic procedures to concentrate and purify the compound. Each approach shows how a balance between efficiency and selectivity matters, particularly for industrial scale-up or for ensuring food-grade standards.
Trans-2-dodecenal stands out because it brings both a reactive aldehyde function and an unsaturated site into one package. Researchers often take advantage of this by running nucleophilic additions—producing alcohols or other derivatives—while oxidation or reduction can quickly swing the compound to carboxylic acids or saturated analogues. Hydrogenation lets chemists toggle between the trans and saturated forms, tweaking scent or flavor notes with each iteration. The double bond supports further transformation too: epoxidation, hydroboration, and even polymerization routes find use in material and flavor research. Each option points back to how versatile and valuable unsaturated aldehydes are as synthetic building blocks.
In research papers, catalogs, and regulatory filings, trans-2-dodecenal pops up as (E)-2-dodecenal or just 2-dodecenal when isomer status is clear from context. Other tags include (E)-dodec-2-enal or, less frequently, dodec-2-en-1-al. Commercially, you may spot “Coriander Aldehyde” or names alluding to its plant sources or flavor role. This blend of systematic terminology and practical trade naming reflects broader trends in chemical nomenclature—clarity for the lab, accessibility for industry partners.
Working with trans-2-dodecenal requires careful attention to health and environment. Its irritant character means that direct contact with skin or eyes should be avoided, and proper ventilation cuts down risks during weighing or transfer. Training focuses on engineering controls, the use of gloves and goggles, and prompt cleanup of spills. Waste handling follows both chemical and odor management practices, with small quantities disposed of via incineration or chemical neutralization. Exposure limits draw guidance from aldehyde safety records, especially for workers in fragrance, food, or analytical labs. Regular review of safety data sheets makes sure that practices keep current with evolving regulations and toxicological findings.
The reach of trans-2-dodecenal grows past its natural role in food and beverage into fragrance, household cleaners, and even some insecticidal products. Flavors benefit from the citrus-fresh and green notes it adds, showing up in seasonings, baked goods, snacks, and beverages in low concentrations to avoid overpowering the palate. Perfume designers count on its aroma to add complexity or top notes, sometimes using it to suggest sweet, green, or aldehydic facets. Agrochemical research finds that some unsaturated aldehydes disrupt or repel pests, leading to innovation in more sustainable repellents. In analytical chemistry, it can serve as a marker for authenticity of certain oils or trace composition studies.
Ongoing studies into trans-2-dodecenal track both application expansion and health effects. Food scientists continue investigating how aldehydes contribute to characteristic, desirable flavors, as well as their stability during storage and cooking. Chemists mapping its transformations look to tailor new products with longer shelf life or custom aroma profiles. In fermentation and bioengineering, work aims to optimize biosynthesis routes from renewable feedstocks, sidestepping more energy-intensive petrochemical steps. Analytical techniques advance too, with high-sensitivity methods allowing reliable residue tracking, which supports both quality control and food safety.
Trans-2-dodecenal sits in a group of natural chemicals that appear in spices, herbs, and other edible plants, so its broad toxicity profile stays relatively low for trace human exposure. Animal studies push the safety envelope higher, checking for cumulative effects or possible sensitization with repeated or higher-dose exposure. Food safety regulators draw on these results to set regulatory thresholds, ensuring that commercial use in flavors or fragrances does not approach risky levels. Still, as more people push for disclosure around natural and synthetic additives, detailed studies appear essential not only for human health but also to reassure and inform consumers.
The outlook for trans-2-dodecenal looks healthy as both chemists and producers recognize consumer shifts toward plant-based or naturally derived ingredients. Sourcing from natural oils and sustainable biosynthetic routes may lower environmental impact and boost appeal. Expect further research into more eco-friendly synthesis, fine-tuning application blends, or exploring new uses—maybe even outside of flavors and fragrances, as green chemistry or advanced materials fields look for small molecules with useful dual reactivity. Each step forward connects chemistry innovation with practical impact in daily products, making compounds like trans-2-dodecenal more visible to scientists, producers, and even the broader public.
You may not spot “trans-2-dodecenal” on a pantry label, but it’s dropping flavor all over the place. Chemists talk about trans-2-dodecenal like bakers talk about vanilla. In tiny amounts, it shapes taste and scent more than most people realize. I once tried to recreate the zing in cilantro-heavy salsa with a homegrown bunch, only to find that punch was missing. I learned later that this compound gives that recognizable, fresh snap you find in cilantro, and even in some orange peels.
Trans-2-dodecenal steps into the limelight mainly in the food industry. It’s not a chef’s go-to when reaching for ingredients, but flavor houses use it to boost citrus and green notes. Spicy snacks and certain salsas get their edge from it. Walk through a supermarket snack aisle and pick up a bag of lime-flavored chips—the bright, powerful aroma owes a lot to this molecule. Some folks with sensitive noses can smell it in a packet even before opening. It’s strong enough in pure form that even a drop can overpower a pot of stew.
Trans-2-dodecenal finds work outside the kitchen, too. Perfume designers turn to it for a leafy or zesty sharpness, especially in green or citrusy scents. I’ve noticed this crisp character in some deodorant sticks marked “fresh” or “clean linen.” That clean, just-peeled-orange sensation in a room spray often involves this little piece of chemistry. Even dish soaps lean on it to reinforce the “fresh-cut citrus” vibe, trying to make household chores feel less like drudgery.
Researchers have found this aldehyde popping up in places most people never expect. Studies point to its use as a mosquito repellent. Scientists caught on because cilantro and its relatives often go untouched by browsing bugs. By isolating trans-2-dodecenal, labs discovered it keeps some mosquitoes at bay, sometimes even matching DEET in controlled conditions. There’s logic to using plant-based compounds for pest control—less environmental baggage, and lower odds for allergy triggers.
Like most strong-smelling compounds, safety gets attention. Trans-2-dodecenal shows up naturally in food, which makes it less mysterious than synthetic additives. But concentrated forms call for a gentle hand. A few case reports connect high doses with skin or eye irritation. The food industry keeps levels in check through standards set by bodies like the FDA and the European Food Safety Authority. They base guidelines on animal studies, reviewed every few years. Home cooks rarely see it plain, so the main risk pops up in factories and laboratories.
Control matters with chemicals, even the ones pulled from plants. Small producers can find guidelines on safe handling through occupational safety groups. For curious cooks, the take-home lesson is to trust regulatory authorities for keeping foods safe. In labs, researchers continue mapping out its uses—screening for allergic reactions and exploring its broader role as a green alternative in agriculture. Long story short, trans-2-dodecenal enhances our world’s flavors and scents with careful use and oversight.
trans-2-Dodecenal isn’t a household name, not for most folks anyway, but it pops up in the food world more often than people might notice. Chemists know it as an unsaturated aldehyde with a light, slightly citrusy scent. Food makers have used it to add flavor — its tang can turn a bland item into something a little more interesting. You’ll see it in some seasonings or ready-to-eat foods, and sometimes in cleaning solutions just for the aroma.
For anything added to food, safety takes top priority. Before I eat or serve something new at home, I run through the same process: who checked it, how has it been used, and what do real scientific findings say? The U.S. Food and Drug Administration (FDA) and organizations in Europe have dug into aldehydes like trans-2-dodecenal. In low amounts, the kind used in food flavoring, reports haven’t flagged any big safety troubles. Long-term animal tests find few signs of toxicity at normal doses, though those aren’t perfect mirrors for people.
Some researchers have pointed out that “aldehydes” might sound concerning because this group includes chemicals people try to avoid. Not every aldehyde shares the same risk, though. A trace amount in a snack isn’t in the same league as strong industrial stuff. People sometimes forget this, confusing chemistry class labels with real risks at typical levels found in food.
Trust doesn’t just come from regulators. If I’m looking for advice, I look for real testing, not just company press releases. Reviews by independent groups like the Joint FAO/WHO Expert Committee on Food Additives look at peer-reviewed studies, not just submitted company data, to spot risks. Consumers need clear labels and honest communication, especially for people with allergies or sensitivities, since even safe substances for most can cause trouble for a few.
trans-2-Dodecenal can help food flavor without salt or extra sugar. That matters in a world worried about high blood pressure and obesity. At the same time, open science matters. Sharing methods and data lets outside experts spot issues early. This approach matches with the “Experience, Expertise, Authoritativeness, and Trustworthiness” approach suggested by Google and medical professionals. A company that hides behind trade secrets or fine print looks suspicious, no matter how many certificates they have.
Even “natural” or low-level additives can build up if someone overdoes processed snacks. History brings up examples where something considered fine at first caused harm decades later, after wider exposure. That’s why routine review matters, not a one-and-done approval. Using tools like food frequency surveys or long-term cohort studies, researchers catch rare effects that short studies can miss. People also differ in their enzyme levels, so one person’s harmless dose could bug someone else.
Continuous safety testing, honest labeling, and independent oversight keep things safer for everyone. If a new study finds anything unexpected, regulators should update advice and labels. For families and individuals, keeping an eye out for reactions and reading new guidance matters more than trusting sales pitches or old habits. Responsible science, clear rules, and consumer awareness work together. That’s what stands between a risk and a kitchen table.
A molecule like trans-2-Dodecenal, known in the chemistry world for the punch it packs, tells its own story. The name suggests a chain of twelve carbons (dodec-) with an aldehyde end (-al) and a double bond at the 2-position. The word “trans” means the hydrogens at the double bond sit on opposite sides—no crowding, which makes this structure more linear.
Its shorthand formula, C12H22O, might not excite foodies or perfumers at a glance, but this compound shapes scents and flavors from coriander to citrus peels. In my experience studying organic chemistry, trans-2-Dodecenal doesn’t just tick off chemical boxes. It’s behind that punchy kick in cilantro and the refreshing zest of lime.
Take a look at the layout: a straight chain of carbons, a double bond sitting between the second and third spot, the hydrogen atoms in a trans arrangement, and a terminating aldehyde group. There’s no getting around the significance of these subtle changes. In cooking, the trans form makes all the difference: mild, clean, and reminiscent of fresh herbs, far removed from the heavy or earthy notes of its cis counterpart. Chefs and product formulators want this exact molecule because the nose knows the difference.
Beyond the kitchen, trans-2-Dodecenal lands itself in the labs studying mosquitoes, who are not fans of this compound. A 2018 study published in Scientific Reports showed how this aldehyde repels mosquitoes at concentrations that humans barely notice. Whether you call it a culinary gem or a vector-fighting hero, its linear trans-configuration ensures specificity in the way it interacts with living systems, from taste buds to insect antennae.
Large amounts of trans-2-Dodecenal come from sources like coriander seed oil, but synthetic production also fills gaps when natural supplies run dry or prices spike. This isn’t just an industrial choice; the environment comes into play, too. Too much overharvesting or inefficient extraction means upset ecosystems, higher costs, and—believe me—cranky farmers down the line. Solid quality control, transparency about origin, and fair relationships with growers keep this story honest.
People in food science, perfumery, and agriculture need a reliable, pure supply. High-performance liquid chromatography (HPLC) and gas chromatography can check for purity and keep unwanted isomers from sneaking in. Smell and flavor purity translates to consistent products, and in research, the right chemical ensures accurate results.
Sustainability in chemical manufacturing plays a bigger role today than it did in my undergraduate days. Waste treatment, bio-based synthetic routes, and “green” extractions matter just as much as molecular structure. Which means companies and universities have begun leaning into biotechnology, using enzymes to help build trans-2-Dodecenal cleanly. This shift keeps hazardous byproducts low and supports smaller-scale producers who want to keep their products on friendly terms with both planet and palate.
To some, trans-2-Dodecenal looks like a puzzle of atoms and bonds. To cooks, entomologists, and chemists alike, it’s proof that a slight shift in molecular orientation can shape taste, scent, and even public health. Paying attention to where these molecules come from and how they’re used keeps innovation honest and impactful.
trans-2-Dodecenal sounds like a chemical you’d expect to find only in a research lab, but it actually pops up in some foods and fragrances. This compound turns up naturally in cilantro and coriander. Some flavor companies use it to build up citrus or fresh notes in food. Its scent reminds people of orange peels and green herbs. For most people, this chemical means nothing until it becomes a subject on a shopping list.
Questions about where to buy pure chemicals like this keep cropping up across cooking forums and research platforms. Most shoppers who search for trans-2-Dodecenal have either discovered its unique qualities for the first time or are chasing a hyper-specific recipe or experiment. Because of its dual role as a flavoring and as a raw material for further synthesis, demand varies wildly.
trans-2-Dodecenal isn’t something you see near the vanilla extract at the store. Its main suppliers operate in the flavor, fragrance, and laboratory industries. Reputable chemical distributors, like Sigma-Aldrich, TCI America, and Alfa Aesar, sell it on their platforms. They require documentation and verification from the buyer. Individuals can’t fill out a cart and check out without proving they need it for research, professional product formulation, or similar legitimate reasons.
Since labs across the world use it, many online marketplaces—LabAlley, Fisher Scientific, ChemShuttle—list this compound in various purities and quantities. These platforms work with universities, flavor houses, and research outfits. Most deals involve emailing a sales team, sending supporting documents, and agreeing to safety and shipping rules.
The chemical supply chain faces heavy regulation for good reason. Not all synthetic compounds are harmless. Even something that occurs naturally in our food might become hazardous in pure, concentrated form. A fact I’ve witnessed: chemicals that sound benign to the average person can trigger allergic responses or worse when handled without real knowledge.
Legal controls help prevent misuse. Rogue actors scouting obscure compounds have ruined things for everyone. If someone uses these substances for experiments or products that fall outside safe boundaries, communities and regulators take note. For this reason, established suppliers guard access. Industry gatekeeping isn’t just bureaucracy; it protects public health and supply-chain integrity.
There is no legal path for a kitchen hobbyist or curious citizen to buy pure trans-2-Dodecenal without professional justification. Some hobbyists look for flavor extracts or essential oils that naturally contain tiny amounts of this aldehyde. That isn’t quite the same as the pure chemical, though. If you stumble on anyone offering unregulated access or suspiciously casual delivery, walk away. That’s a sign something’s not right.
Online forums, sometimes, steer seekers toward international merchants with no oversight. This road often leads to scams or customs headaches, and sometimes to legal trouble.
Instead of chasing the raw chemical, focus on end-use products. If it's the taste or aroma that intrigues you, professional flavorings deliver consistent, safe results. If you really need pure trans-2-Dodecenal for valid scientific work, reach out to trusted suppliers prepared for due diligence and documentation. Education and transparency always serve better than shortcuts. There’s good reason for strong controls: safety, trust, and reliability matter.
Walk into a kitchen, slice a fresh cilantro leaf, and that sharp, almost citrusy-green scent jumps at you. That’s where trans-2-dodecenal comes in. This molecule shows up naturally in coriander and cilantro, and once you catch its aroma, it leaves a real impression. The first thing most people notice with trans-2-dodecenal is its punch: a bright, citrus note layered with green, waxy tones. It’s not just a simple green or lemony scent—it rounds out with hints of cucumber and soap, and sometimes people even mention a slight metallic twist.
Those who grew up eating Latin American or Southeast Asian food might not realize they're experts in detecting this aroma. Fresh coriander in salsa, Thai salads, or chutneys owes much of its crisp "fresh" smell to trans-2-dodecenal. Scientists running gas chromatography-mass spectrometry studies consistently identify this compound whenever they break down the fresh, grassy-lemon bouquet of coriander leaves.
It’s a polarizing smell. Some people find it delightful, calling to mind clean laundry mixed with a lime grove. Others sense something oily, almost like bug spray, and dislike it. I remember in sensory labs, test panels split on describing it as either delightfully zesty or strangely soapy. This isn't just a matter of taste—genetics play a part in your experience, and studies show that a part of the population with a certain gene finds the scent unpleasant, even reminiscent of soap.
Flavorists and fragrance experts rely on trans-2-dodecenal for its ability to provide an unmistakable green kick. Even tiny amounts transform bland or flat scents into something lively or herbaceous. Think about how a bit of lime zing brings out life in a rich curry, or the way fresh parsley finishes a soup. It’s the same trick on the nose: this molecule wakes up whatever it touches.
The food and beverage industry grabs hold of trans-2-dodecenal for flavoring, especially in processed and convenience foods aiming for "fresh vegetable" notes without actual vegetables present. It takes a careful hand, though—overdo it, and the scent overpowers, masking the subtlety of other ingredients. Perfumers and soap makers chase a crisp, fresh lift in their products, and this compound fits the bill in green and citrus accords.
Still, there’s more at play than flavor or scent. Researchers have looked at trans-2-dodecenal’s antimicrobial properties, noting its potential to slow spoilage or even fight bacteria like salmonella. Evidence points toward a meaningful use in food preservation or natural cleaning products. Real-world applications need caution—nobody wants to bite into bread that tastes like soap, so formulation and testing stay important.
Formulators face challenges with stability and the human factor. This compound degrades under light and heat, so storage and packaging make a difference. Companies working with it train staff to use their noses as well as analytical tools because machines don’t always catch "too much soap" until it’s too late. Packaging engineers work on UV-blocking containers and flavor houses develop encapsulation methods to keep that bright green character from fading.
Those in product development might talk with culinary professionals before finalizing anything with trans-2-dodecenal—after all, authentic flavor can’t come just from a synthetic molecule. For consumer goods, transparent labeling and clear communication about source and function keep trust strong, aligning with the rising demand for ingredient traceability and safety in food science.
References:| Names | |
| Preferred IUPAC name | (E)-dodec-2-enal |
| Other names |
trans-2-Dodecenal E-2-Dodecenal 2-Dodecenal (E) trans-Dodec-2-enal |
| Pronunciation | /træns tuː doʊˈdɛsɪn.æl/ |
| Identifiers | |
| CAS Number | 20407-84-5 |
| Beilstein Reference | 0111247 |
| ChEBI | CHEBI:87314 |
| ChEMBL | CHEMBL3181436 |
| ChemSpider | 77147 |
| DrugBank | DB11438 |
| ECHA InfoCard | 100.020.336 |
| EC Number | 206-455-5 |
| Gmelin Reference | 925458 |
| KEGG | C10125 |
| MeSH | D000229 |
| PubChem CID | 5364447 |
| RTECS number | JR0425000 |
| UNII | 6A4T5K429T |
| UN number | UN3276 |
| Properties | |
| Chemical formula | C12H22O |
| Molar mass | 184.31 g/mol |
| Appearance | Colorless to pale yellow liquid |
| Odor | soapy; orange; cilantro |
| Density | 0.833 g/mL at 25 °C (lit.) |
| Solubility in water | Insoluble in water |
| log P | 3.95 |
| Vapor pressure | 0.0177 mmHg (25 °C) |
| Acidity (pKa) | 13.05 |
| Basicity (pKb) | 13.74 |
| Magnetic susceptibility (χ) | -87.8e-6 cm³/mol |
| Refractive index (nD) | 1.4480 |
| Viscosity | 3.54 mPa·s (25 °C) |
| Dipole moment | 2.7642 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 441.7 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -74.0 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -7110.7 kJ/mol |
| Pharmacology | |
| ATC code | A16AX18 |
| Hazards | |
| GHS labelling | GHS07, GHS09 |
| Pictograms | GHS05,GHS07 |
| Signal word | Warning |
| Hazard statements | H315, H317, H319, H411 |
| Precautionary statements | Precautionary statements: P261, P264, P272, P273, P280, P302+P352, P305+P351+P338, P321, P332+P313, P333+P313, P337+P313, P362+P364, P501 |
| NFPA 704 (fire diamond) | NFPA 704: 2-2-0 |
| Flash point | 108 °C (226 °F; 381 K) - closed cup |
| Autoignition temperature | 160 °C |
| Explosive limits | Explosive limits: 0.7–5.4% |
| Lethal dose or concentration | LD50 (rat, oral): 2200 mg/kg |
| LD50 (median dose) | LD50 (median dose) for trans-2-Dodecenal: 2200 mg/kg (oral, rat) |
| NIOSH | NJ2 6002058 |
| PEL (Permissible) | PEL (Permissible Exposure Limit) for trans-2-Dodecenal: Not established |
| REL (Recommended) | REL (Recommended): 0.1 ppm |
