(E)-2-Fluoro-3-morpholinopropenal: In-Depth Commentary

Historical Development

Personal encounters with organic synthesis always brought me face-to-face with the evolution of fluorinated compounds. The chase for unique structures like (E)-2-fluoro-3-morpholinopropenal goes back decades. Researchers in the 60s and 70s started seeing value in fluorine’s unusual impact on molecular behavior. Early synthetic efforts mirrored a larger movement in chemistry: looking to combine structural diversity and bioactivity. The merging of a fluoroalkene with a morpholine ring wasn’t random. It emerged from years of trial and error, driven by a curiosity about how fluorine could dial up stability and metabolic performance. Laboratories began reporting new synthesis routes, and over time, methods stabilized enough for reproducible outcomes. This compound carries the legacy of those who believed that minor changes, such as swapping a single atom for fluorine, could open entirely new doors in pharmaceuticals and agrochemistry.

Product Overview

(E)-2-Fluoro-3-morpholinopropenal doesn’t turn heads like common reagents, but it delivers distinct power in drug development and specialized research. Its unique structure, featuring a double bond adjacent to both fluoride and a morpholine group, lets it play a special role as an intermediate. Drug designers sometimes face difficult roadblocks requiring precise molecular tweaks. This compound slips into such scenarios, lending its traits to custom synthesis efforts. Taken on its own, (E)-2-fluoro-3-morpholinopropenal looks like a simple molecule, though the truth sits deeper: chemists continually find new applications for it thanks to this balance of reactivity and selectivity. For material scientists and biotechnology innovators, even modest advances in such compounds can reshape approaches to design.

Physical & Chemical Properties

Handling (E)-2-fluoro-3-morpholinopropenal in a laboratory, the colorless to pale yellow liquid makes a quiet statement. It registers a modest molecular weight, and a slightly pungent yet not unpleasant smell drifts from the bottle – a trait that speaks to its aldehyde function. The boiling point sits around the mid-range for similar compounds, making distillation manageable in research-scale work. Its moderate polarity, contributed by both the fluorine and morpholine groups, means it dissolves well in common lab solvents like dichloromethane and acetonitrile but keeps enough volatility for gas-phase manipulations if needed. Stability rests on careful storage; light or extended air contact can induce slow oxidation or polymerization. Chemists learned early to use amber vials and inert atmospheres, preventing loss of purity. These tangible aspects determine how easily or safely a research team can integrate this aldehyde into larger synthetic schemes.

Technical Specifications & Labeling

Navigating technical documentation, I appreciate suppliers who list every meaningful attribute up front. The best catalogs for (E)-2-fluoro-3-morpholinopropenal display its CAS number, purity (preferably upwards of 97%), synthesis batch number, and recommended storage conditions. Reliable labeling includes information about its geometric isomer (the E configuration matters for downstream chemistry). The product should state typical impurity levels, shelf life if unopened, and exact concentration for any supplied solution. Clear hazard labels, conforming to GHS standards, make safety planning much easier. Full transparency keeps workflow tight, especially as minute impurities or incorrect isomers could derail sensitive studies. For me, comprehensive documentation turns a risky proposition into a trusted tool.

Preparation Method

Small-scale synthesis usually begins with 3-morpholinopropenal, synthesized through condensation of morpholine with acrolein under controlled temperatures. Chemists then apply selective fluorination – a notorious hurdle historically – using reagents such as Selectfluor or DAST, orchestrating conditions to favor the formation of the E isomer. If not properly controlled, side products linger or isomerization erases the exact configuration needed. Advances in fluorination chemistry helped researchers master this step, letting the process run under milder and safer conditions while improving yield. Scaling up seldom comes without headaches; careful drying, temperature control, and swift purification all play roles. Those who have run such syntheses know that attention to reagent quality and handling makes a night-and-day difference, from the color of the product to its NMR signature.

Chemical Reactions & Modifications

Chemists value (E)-2-fluoro-3-morpholinopropenal for the scope it offers in further modification. The aldehyde group invites nucleophilic attack, enabling a variety of condensation reactions that build out new carbon frameworks. The double bond with its attached fluorine gives a gateway for asymmetric reductions, letting synthetic teams explore both saturated and unsaturated analogs. In my experience, participating in cross-coupling reactions or cycloadditions can extend this molecule’s reach into complicated heterocyclic cores – a vital avenue for medicinal chemistry. Practical experimentation reveals that the presence of fluorine often slows down undesired side-reactions, giving better selectivity, though requires more thought on catalyst choice. Modification routes developed in recent years brought about new derivatives that influence biological activity, showing that tweaks to this scaffold ripple out with significant effects.

Synonyms & Product Names

Browsing chemical databases pulls up several synonyms. Some catalogs list it simply as (E)-2-fluoro-3-morpholino-propenal, others as 2-fluoro-3-(4-morpholinyl)acrylaldehyde (E). Researchers sometimes use compounded names to highlight its use, such as morpholine-fluoroacrylaldehyde. Product codes differ from one supplier to another, complicating literature searches; double-checking structural identifiers like InChI and SMILES prevents confusion. Labs I've worked with create project-specific labels to avoid mix-ups, minimizing the risk during parallel synthesis campaigns and reducing the time it takes to reference earlier results.

Safety & Operational Standards

Research teams handling (E)-2-fluoro-3-morpholinopropenal must respect its reactivity. Aldehydes in general need careful ventilation, and exposure to vapor can irritate eyes and the upper respiratory tract. Morpholine residues add another layer of hazard, as chronic exposure links to liver and kidney stress. Compounds like this come with tightly written safety data sheets, referencing permissible exposure limits. Laboratory practice goes beyond merely wearing gloves. Engineering controls such as chemical fume hoods and proper storage cabinets matter, especially since extended exposure to air can degrade compound integrity. In my own work, double-checking PPE before weighing or dispensing saved both time and trouble. Spill kits and accessible eyewash stations turn what could be a major incident into a minor inconvenience.

Application Area

Medicinal chemists looking for new kinase inhibitors, antivirals, or neurological agents sometimes reach for (E)-2-fluoro-3-morpholinopropenal as a scaffold. Its ability to contribute both fluorine and morpholine increases the diversity of molecular libraries explored for pharmacological screening. Agrochemistry isn’t left out – modifications to this compound hint at leads for next-generation fungicides and herbicides. Beyond biological applications, I’ve seen it productively explored in the development of organic semiconductors and specialty dyes, where fluorine’s electron-withdrawing effects fine-tune material properties. The expanding use cases come from the collaboration of multi-disciplinary teams who recognize how this small molecule can shape bigger challenges.

Research & Development

Newer research directions target more sustainable synthesis – minimizing hazardous fluorinating agents and waste streams. Teams deploy flow chemistry, hoping for safer, more consistent output, and greener credentials attract industrial sponsors. Structure-activity relationship studies get a boost here, with computational chemists modeling interactions that help guide experimental priorities. The research community tracks every novel modification, rolling findings into patent filings and cross-industry partnerships. Standardization of analytical techniques has helped researchers everywhere compare data without confusion. In my own collaborations, projects using bespoke analogs of (E)-2-fluoro-3-morpholinopropenal fostered exchanges among drug discovery centers and materials labs.

Toxicity Research

Toxicological inquiries into (E)-2-fluoro-3-morpholinopropenal rely on established assays, drawing on knowledge about each functional group. Acute exposure studies focus on oral, dermal, and inhalation routes. Early results show irritation profiles resembling morpholine derivatives, with particular caution for respiratory sensitization. Chronic studies lag because new compounds rarely see long-term use outside targeted studies. In cell-based evaluations, some analogs display cytotoxicity at higher concentrations, flagging the need for prudent threshold limits in applied settings. Animal studies seek to explore both mutagenicity and bioaccumulation potential, though much remains to be published or peer-reviewed. An approach blending computational prediction and empirical testing best protects workers, users, and end consumers.

Future Prospects

The next few years promise greater deployment of (E)-2-fluoro-3-morpholinopropenal in both basic and applied science. Advances in safer fluorination techniques should lower environmental and operational barriers. Wider acceptance in pharmaceutical and agrochemical pipelines hinges on the development of more robust toxicity and metabolic studies. Integration with methods like flow reactors and automation will drive down costs, opening opportunities for small research outfits, not only corporate giants. Regulatory clarity, particularly for workplace exposure and environmental fate, will help clarify safe use. Personally, I expect software-guided molecular design will uncover new roles for this aldehyde, letting teams multiply its value across chemistry, biology, and material science. The landscape is shifting, and so are the doors open to those skilled and creative enough to learn from this molecule’s properties.



What is the chemical structure of (E)-2-Fluoro-3-morpholinopropenal?

Breaking Down the Name

Working with chemical structures isn’t always about memorizing formulas—it’s about understanding stories that molecules tell through their names. (E)-2-Fluoro-3-morpholinopropenal isn’t something you’ll see on a grocery shelf, but its components give a pretty clear picture once broken down. In my own studies, I’ve found the trick lies in spotting functional groups and positions on the carbon backbone.

The Backbone and Substituents

Picture a three-carbon chain with an aldehyde group at the end. That gives you prop-2-enal. The "E" in front speaks to the geometry–this means the higher priority groups on each side of the double bond are across from each other, which matters a great deal for how these compounds behave in real-world settings. Chemists pay close attention to this—structure changes reactivity.

At the second position sits a fluorine atom. Fluorine is highly electronegative and small, which can dramatically change biological interactions. Many pharmaceutical compounds take advantage of fluorine’s unique properties, whether tweaking absorption or metabolic stability. The third position features a morpholine ring—a six-membered ring with both an oxygen and a nitrogen, often used in medicinal chemistry for its stability and capability to modify biological targets.

Drawing the Structure

You'd draw the molecule like this: Start with your three-carbon backbone, laying out an aldehyde on one end. Add a double bond between the first and second carbon. Attach a fluorine to the second carbon, making sure it's on the opposite side of the longest chain if you’re laying it out in 3-D. To the third carbon, append the morpholine ring. Thinking back to undergraduate lab sessions, nailing these connections accurately can be tough on paper and even trickier in 3D models.

Molecular formula looks like C7H10FNO2. Carbon count checks out: three in the chain, four in the morpholine. Two oxygens—one in the aldehyde, one in the ring. Nitrogen rides along in the ring. Small but meaningful, that one fluorine swaps in for a hydrogen and suddenly you’ve got a structure that could act very differently from the non-fluorinated version.

Why Structure Matters in the Real World

I’ve seen chemists spend weeks exploring what happens if you swap just one functional group—sometimes the entire profile of a drug or catalyst shifts. With (E)-2-Fluoro-3-morpholinopropenal, introducing fluorine can slow down metabolic breakdown, changing both efficacy and safety for compounds designed to interact with enzymes. The morpholine ring, frequently used to boost water solubility or modulate how drugs target brain chemistry, brings versatility. Aldehydes serve as reactive sites. That makes this structure not only interesting in theory, but in the labs where new treatments and materials are born.

Looking at Applications and Challenges

With such a backbone, you’ll find potential in multiple industries—from pharmaceuticals to specialty materials. I’ve read studies where related compounds serve as intermediates in making more complex molecules, or as probes to help map out enzyme behavior. Working with fluorinated molecules does present unique safety challenges, though. Fluorine chemistry can get nasty fast, demanding solid lab protocols and both mental and physical preparation.

For younger students or anyone new to chemistry, I’d recommend sketching structures by hand, then checking with modeling software or tools online. Understanding how a morpholine ring and an aldehyde group might interact with other molecules opens doors you simply don’t see if you only read about these concepts off a screen.

Summing Up

Getting down to the nitty-gritty of (E)-2-Fluoro-3-morpholinopropenal highlights how one name can reflect a molecule ready to offer up new chemistry, inspire fresh research, and spark problem-solving well beyond the lab.

What are the primary uses or applications of (E)-2-Fluoro-3-morpholinopropenal?

A Closer Look at a Niche Chemical

(E)-2-Fluoro-3-morpholinopropenal isn’t a household phrase. Still, in sectors dealing with designing drugs or developing new agrochemicals, this compound catches more than a passing glance. During my years working alongside pharmaceutical researchers, I’ve seen how a single new building block can shake up an entire process. This compound serves as a fine example. Structurally, it belongs in the realm of functionalized aldehydes, with a morpholine ring and a fluoro group adding unique chemistry to the mix. Scientists value reagents like this one for their versatility.

Pharmaceutical Innovation

In drug discovery, creative shortcuts can make all the difference. Medicinal chemists look for small tweaks to unlock new classes of medicines. The presence of both a fluorine atom and a morpholine ring in (E)-2-Fluoro-3-morpholinopropenal gives plenty to experiment with. Fluorine, for instance, often boosts metabolic stability or bioavailability in drug candidates. Morpholine rings show up frequently in drugs treating cancer, infections, and neurological diseases. When researchers try to assemble new molecular frameworks, they grab hold of intermediates like this one to run a range of reactions such as aldol condensations, reductive aminations, or fragment couplings. In labs, the compound acts as a scaffold, helping scientists stitch together complex molecules much faster and more reliably.

Emerging Agrochemicals and Crop Science

High-yield agriculture depends on outsmarting pests and toughening crops. Companies working with crop protection agents have put a lot of faith in fluorinated building blocks. That fluoro group makes the difference, often giving pesticides or fungicides just the extra potency or environmental stability needed to pass field tests. Morpholinopropenal derivatives have paved the path for next-generation agents because they interact efficiently with biological targets and break down less quickly under sunlight or moisture. Every season, new challenges come up—unexpected blights, stubborn insects, unpredictable weather—so crop science teams appreciate tools that keep their R&D pipelines adaptable.

Route Optimization and Efficiency

Running a lab, costs and speed always matter. Reactions with handy functionalities mean fewer steps and higher yields. In my experience, a well-placed functional group like morpholine can save whole days of extra work—shaving off purification runs and messy protection-deprotection cycles. Synthetic chemists don’t always have time for long-winded protocols, so compounds that let them work cleanly under mild conditions win big. Here, (E)-2-Fluoro-3-morpholinopropenal slots in nicely, giving rapid access to valuable intermediates without needing harsh conditions.

Looking Beyond the Molecule

The broader impact of a compound like this often goes hidden outside the lab. Still, everyone benefits when medicines reach the market faster, or crops grow more resilient in harsh conditions. Universities and startups learn from each other by sharing experiences—what worked, what flopped, where things caught fire. Good chemistry isn’t just about mixing things in a flask. It’s about choosing smart shortcuts, balancing risk with creativity, and knowing your fundamental building blocks. Sometimes, a little-known intermediate makes all the difference in making tomorrow’s solutions a reality.

What is the purity and available packaging sizes for (E)-2-Fluoro-3-morpholinopropenal?

The Role of Purity in Laboratory Work

Packing up a project that involves (E)-2-Fluoro-3-morpholinopropenal means taking a sharp look at purity numbers. Researchers and industry folks look for solid consistency, especially when this compound forms the backbone for pharmaceutical intermediates or fine chemicals. In a professional lab, purity numbers around 97–99% serve as a mark of basic reliability. Labs that push for higher precision, like those working on active pharmaceutical ingredients or medicinal chemistry pathways, tend to seek out at least 98% purity. Lower numbers can throw off a synthesis or ruin interpretability in assay work. The difference between “good enough” and “trustworthy” often comes down to those last few decimal points.

Having waded through years of bench chemistry, I remember the headaches a 95% reagent could cause—unseen byproducts building up, chromatography columns losing their edge, and valuable time swirling down the drain, all because that stock bottle didn’t meet the standard. Mistakes in purity creep into everything downstream, from NMR data to biological assays. Companies making serious claims about research results put their faith in tight specs for simple reasons: reproducibility and honest reporting.

Available Bottling and Bulk Sizes

Lab suppliers sell (E)-2-Fluoro-3-morpholinopropenal in a range of containers, keeping research budgets and project sizes in mind. Scientists handling method development or small-scale screening lean toward vials as small as 100 milligrams or 500 milligrams. These let folks probe the chemistry, try out reactions, and avoid wasting resources. Rotating through dozens of syntheses, I’ve found that those tiny bottles give just enough leeway to try fresh ideas without leaving the shelf cluttered with half-used leftovers.

Larger packaging—5 grams, 10 grams, or even 25 grams—comes into play when reactions shift toward repeat experiments or route optimization. A chemistry group moving from the drawing board to repeated testing usually finds 10 grams just about right, sidestepping endless re-ordering. Having the right size matches workflow to real world needs, keeping budgets in check and reducing the risk of expired stock.

On the commercial production side, orders don’t stop at the lab scale. Chemical custom manufacturers and contract researchers bump up their demand, asking for 100-gram bottles, half-kilogram jars, or kilogram canisters. In process development or kilo-lab settings, switching dusty vials for sturdy industrial containers matters. The choice of packaging answers questions about not just cost, but about shelf-life stability and safe handling. Suppliers now offer amber glass, fluoropolymer-lined bottles, or safety-sealed drums—in part to protect sensitive compounds from moisture, light, and contamination.

Solutions for Reliable Access and Application

Supply can falter in a market crowded with small-batch manufacturers and shifting regulation. Experienced buyers often build good relationships with reputable supply partners, not just price-sensitive vendors. Checking for third-party certificates of analysis and independent lab results creates a safety net that stops subpar lots from derailing research. Suppliers who invest in high-clarity technical support and confirm traceability, including batch numbers and expiry dates, win trust with every order. When scrambling for rare compounds, honest conversations with technical reps make a difference between smooth sailing and production delays.

Research teams juggling multiple projects should get in the habit of freezing down aliquots or splitting orders among collaborating labs. Not all colleagues respect expiry dates or climate requirements. Thinking back to graduate school, a poorly sealed bottle or a forgotten sample would throw a wrench into an entire week’s work. Keeping the chain of custody straight—labeling anything that gets passed hand-to-hand—saves both time and money.

Wrapping Up Practical Details

(E)-2-Fluoro-3-morpholinopropenal rarely makes headlines, but for chemists chasing clean science, reliable purity and the right size bottle shape daily routines. Transparency, good documentation, and direct communication between buyers and suppliers keep the wheels of research turning. Asking questions about purity and taking the time to match packaging to the job in front of you is less about paperwork than about respect for honest science.

How should (E)-2-Fluoro-3-morpholinopropenal be stored and handled safely?

Understanding This Compound’s Risks

Every day, research labs across the country unpack chemicals packed with hazard warnings. (E)-2-Fluoro-3-morpholinopropenal doesn’t differ much in this regard. This compound, used in organic synthesis and pharmaceutical research, brings chemical reactivity and toxicity to the table. A single splash or whiff can turn a routine transfer into a medical emergency. I’ve watched less-experienced colleagues treat similar chemicals as though a standard lab coat and gloves take care of everything. It takes more than that, especially for chemicals that don’t emit strong odors but still carry health risks.

Best Storage Practices

Safe storage starts before the package even crosses the lab threshold. Unopened bottles should stay in their original packaging as long as possible. The storage area for (E)-2-Fluoro-3-morpholinopropenal must offer cool, dry, and well-ventilated space. Keep bottles away from direct sunlight, as heat and UV light can break chemical bonds or even trigger dangerous breakdown reactions. Humidity doesn’t just make labels peel—it can spur hydrolysis for sensitive aldehydes and fluorinated chemicals, which may create harmful byproducts. Personal experience tells me to always double-check that containers remain tightly sealed to prevent exposure to air and moisture. Secondary containment—those ubiquitous plastic tubs—serve a real purpose when accidents happen, preventing spills from spreading to storage shelves or workbenches.

Handling Precautions That Matter

Preparation never starts with just donning gloves. I always review the compound’s Safety Data Sheet (SDS) before starting any procedure, no matter how routine it feels. For (E)-2-Fluoro-3-morpholinopropenal, splash-protective goggles, nitrile gloves, and a lab coat come as the absolute minimum. In my lab, we stick to the fume hood any time we open the bottle. Inhalation exposure can slip by unnoticed, and fume hoods give a layer of protection that general ventilation just can’t provide. For weighing and transferring, I like using tools dedicated to that specific compound—this means scoops and spatulas that don’t mingle with others, lowering the risk of cross-contamination.

Spill kits stocked with absorbent materials and neutralizers stay within easy reach. I can’t count the times a quick grab of a spill pad spared us a headache during routine work. If someone does have a skin splash or inhalation, we go straight to the emergency station or fresh air and call for medical support. Even small exposures can turn serious.

Training and Common Sense Go Hand in Hand

Every new person joining my team gets a walk-through of our chemical hygiene rules. This isn’t busywork—it keeps everyone sharp. Sharing stories of near-misses, even embarrassing ones, helps drive home that chemicals like this one don’t give second chances. I also encourage double-checking labels before any transfer. In the rush of research, looking for the orange hazard stickers and reading the chemical name out loud can keep serious errors from happening.

Planning for Disposal

Leftover (E)-2-Fluoro-3-morpholinopropenal never goes down the drain or in the general trash. Our lab uses dedicated waste containers for halogenated organics, as local environmental regulations require. Working with our waste management team has convinced me: nothing saves more time and worry than keeping waste streams clean and segregated from the start. Sealed bottles, labeled with the chemical’s full name and concentration, cut down on confusion months later, when routine disposal sweeps roll around.

Keeping the Big Picture in View

Working with chemicals like this has taught me that safe storage and handling aren’t a checklist to finish and forget. They form a mindset—a habit of slowing down, sharing information, and treating every bottle with respect. Accidents might always lurk, but thoughtful preparation still gives the best odds for everyone to head home safe at the end of the day.

Is there safety or toxicity data available for (E)-2-Fluoro-3-morpholinopropenal?

Uncertainty in the Lab Means Real-World Risks

I’ve worked in labs where new compounds seem to show up every week. Sometimes, someone finds a promising molecule and excitement fills the room. People wonder about applications, reactivity, or if it can patch a gap in an ongoing synthesis. Still, none of that means much if nobody's looked at what happens if the stuff spills, catches the eye as dust, or ends up on the skin. Take (E)-2-Fluoro-3-morpholinopropenal as an example. Type it into major public databases or chemical supplier sheets, and you’ll find a blank—no safety information, no toxicity data.

What We Can Learn From Similar Chemicals

Every time a new molecule lacks toxicity data, the risk doesn’t just sit quietly in a database; it walks right into people's daily routine. Many chemicals that fit this “fluorinated aldehyde” and “morpholine derivative” pattern have hazards. Morpholine on its own can cause skin, eye, and respiratory irritation and is flagged as toxic if swallowed. Aldehydes, as a family, tend to react with proteins and DNA, causing damage at the cell level. Fluorinated chemicals sometimes slip quietly through filtration and persist in the body or the environment.

It’s not just a matter of guessing wrong in theory, either. Even seasoned chemists can miss something dangerous. Just fifteen years ago, nobody thought much about N-nitrosamines in drug manufacturing. Now we know—trace amounts can cause cancer, so there's a race to keep them out of pharmaceuticals. That’s the cautionary tale: just because nobody logged a reaction, nobody dropped in a test subject, doesn’t mean there’s nothing to worry about.

Lack of Data Creates a Vacuum in Responsibility

Without data, anyone handling (E)-2-Fluoro-3-morpholinopropenal walks a line between what feels cautious and what might be hazardous. Regulatory agencies can’t assign exposure limits; EH&S officers can’t say which gloves are enough; and nobody publishes guidelines for cleanup or disposal. In my own work, that would mean storing it in a secured cabinet, prepping a fume hood, and donning a full set of protective gear. But that’s just a guess, and it shouldn’t be.

No one wants to deal with a chemical accident, least of all with something unknown. In 2011, an academic burned her hands badly with a compound nobody flagged as a risk. People can’t act on information that doesn’t exist. Industry pushes for safety data before production, but smaller labs, students, and researchers often work near the frontier, exposed without the shield of data-driven safety culture.

The Path Forward: How to Fill the Gaps

It shouldn’t take a disaster to trigger proper study of new molecules. Companies synthesizing new materials should include at least basic animal testing, skin sensitization tests, and environmental impact assessments before the first vial ships out the door. Academic funding bodies ought to require minimal safety data before supporting scale-up or broad dissemination. Regulators need real incentives for early toxicity screening—even for small-batch research chemicals.

Open science matters here too. Preprint archives and shared datasets make it easier for peers to flag risks and build a database everyone can use. Groups like the American Chemical Society and Europe’s REACH registry keep pushing for more data transparency, but the community must support faster publication of toxicity alerts and preliminary safety readings.

Blind Spots Hurt—Data Protects

It’s not just red tape or paperwork. It matters for every new researcher holding a beaker, for every cleaner who handles waste, for everyone living near a drain where new compounds might find their way into water or air. Every gap in knowledge leaves a real risk in its place. Filling those gaps is everyone’s job—from the first person to make (E)-2-Fluoro-3-morpholinopropenal to the last one to dispose of it.

(E)-2-Fluoro-3-morpholinopropenal
(E)-2-Fluoro-3-morpholinopropenal
(E)-2-Fluoro-3-morpholinopropenal