Chemistry has this funny way of revisiting old compounds for new ideas, and methyl dichloroacetate shows exactly why the basics matter. Decades ago, as industrial chemistry boomed after the Second World War, curiosity about halogenated organics shot up. Researchers started to study simple chloroacetate esters, tracing their origins to labs investigating new solvents and intermediates for pharmaceuticals. This compound's track record winds through labs across Europe and North America, popping up in patent filings and research papers on selective alkylations and metabolic experiments. At one point, toxicologists tested it to see what it did to the liver. At another, folks in plastics gave it a try as a building block. Old chemistry journals reveal careful studies showing how even subtle changes in the number and placement of chlorine atoms can make something suddenly interesting for industry or science.
Methyl dichloroacetate falls into that family of small, low-molecular-weight organochlorines that are easy to overlook but hard to dismiss once you see their potential. Its basic framework consists of a methyl ester clinging onto a dichloro-substituted acetic acid backbone, which puts it in a rare category with just a handful of siblings. People working with it often comment on its sharp, maybe even slightly sweet odour—not necessarily dangerous, but not something you forget either. The molecule attracts attention from chemists who need reagents that are just reactive enough for subtle transformations yet stable enough to bottle and ship. Whether published studies focus on mechanistic details or just the practical business of making useful intermediates, the compound ends up showing a knack for slotting into bigger problems in fine chemicals, solvents, and research.
Nobody who sees methyl dichloroacetate in its pure form would call it exciting—clear, colorless, and with a pungent smell. The low boiling point means it turns to vapour at modest temperatures, so labs run proper ventilation if more than a few millilitres are involved. Two chlorine atoms drag the molecular weight higher than you’d guess for such a small molecule, and those same atoms make the compound noticeably denser than water. These halogens also add a level of chemical persistence, something multiple generations of scientists have flagged for both stability and environmental concern. Mix it with polar solvents like ethanol or acetone, and it dissolves well, so it fits into many kinds of formulations or reactions without drama. That volatility makes it a little tricky to store, especially where temperature swings or poor capping might cause pressure to build in sealed glass bottles.
It’s easy to lose track of labels and specs when working with many similar chemicals, but methyl dichloroacetate shows up under several standardized names, and its packaging ought to come with clear hazard statements due to its chlorinated nature. Purity levels often reach analytical standards thanks to the simple distillation and washing steps, avoiding trace acidic leftovers that could kick off unwanted reactions. In the lab, you’ll find it listed by CAS number alongside synonyms, as regulations surrounding organochlorines call for careful recordkeeping. People who work professionally with this compound tend to double-check that safety data sheets and international transport guidelines are in order, and the labeling often flags flammability and irritation concerns front and center.
Anyone who’s run organic synthesis at scale will nod along to the main methods for making methyl dichloroacetate. Classic writers cited acid-catalyzed esterification, where dichloroacetic acid meets excess methanol and a little sulfuric acid, with the result purified by distillation. Some manufacturers opt for direct halogenation routes starting with methyl acetate, though this trickier method risks side products and lower yields. The keys to consistent product quality lie in controlling water content and neutralizing residual acids after reaction, since unchecked conditions can lead to corrosion of glassware or degradation during storage. Making this compound in quantity takes steady hands, good separation equipment, and patience—nobody wants to breathe the fumes, so engineering controls always matter more than just using a fume hood and hoping for the best.
Methyl dichloroacetate doesn’t just sit idle on a shelf—it steps up in a variety of transformations. Chemists rely on it as a source of reactive dichloroacetyl groups, handy for building more complex molecules in pharmaceuticals or agrochemicals. The ester reacts with nucleophiles like amines or alcohols, opening up the possibility for new derivatives. Under harsher conditions, it can serve as a feedstock for making specialized acids or as a stepping stone toward perhalogenated compounds. That dichloro motif sometimes provides just the right balance of reactivity for selective substitutions, in contrast to the trickier business of working with trichloroacetates or simpler acetates. As synthetic strategies lean more toward green chemistry, researchers re-examine routes to make modifications cleaner, with fewer byproducts—always weighing cost against safety and yield.
Anyone with a few years of chemical catalogues under their belt recognizes how the same substance picks up different names depending on the context. Methyl dichloroacetate has gone by its IUPAC label, and by trade names referencing its core structure. Some suppliers may list it under alternative designations tied to its functional group or relate it to similar esters. This variety in naming has occasionally sparked confusion in regulatory filings or import-export paperwork, leading to errant shipments or mistaken identity in the lab. Reliable communication, both in procurement and in data reporting, depends on cross-referencing all known synonyms and double-checking registry numbers. Doctors, researchers, and industrial hygienists stay alert for any naming drift that could obscure safety issues or material traceability.
Working with chlorinated organics always means respecting their potential for harm. Methyl dichloroacetate is no exception. Splashing it on skin or catching a lungful of its vapour brings its irritant properties to the fore. Regulatory agencies have set up guidelines for making and handling it, and they insist on gloves, goggles, and ventilation. Chemical hygiene plans in research and industry stress the importance of storing it in sealed, well-labeled containers away from oxidizers or open flames, since low flash points raise the risk of fire. People tasked with waste disposal remember the environmental concerns associated with chlorinated volatiles. Waste handling demands extra caution so that solvents and residues don’t end up in routine drains or evaporate into unventilated spaces. These rules follow a pattern learned from a century of mistakes with similar compounds—nobody wants history to repeat with preventable spills or exposures.
Methyl dichloroacetate’s practical impact stretches across niches in research, manufacturing and medicine. In chemistry labs it helps stitch together more complex molecules, especially in projects aiming to place precise halogen atoms in a framework. Select drug development pipelines explored it as a metabolic modulator, looking to tweak mitochondrial activity in early-stage research. Certain plastics and specialty solvents grew out of its use as an intermediate, taking advantage of the dichloroacetyl group’s compatibility and reactivity. Small-scale synthetic work thrives on reagents like this—sometimes a complex project fails or succeeds based on the availability of reliable starting materials like methyl dichloroacetate. Though headline-making products might not list it on the bottle, ripple effects from its chemistry show up in the innovation pipeline for coatings, pharmaceuticals, and fine chemicals.
Researchers looking to understand, improve, or replace halogenated compounds have found methyl dichloroacetate an interesting yardstick. Labs studying new metabolic therapies have focused on its ability to influence cellular respiration, leading to a modest but significant burst of peer-reviewed research in oncology and neurology. These efforts build on decades of basic chemical and toxicological studies, searching for new clinical windows while also mapping out the limitations. Other R&D programs dig into its reactivity—aiming to squeeze higher yields out of catalytic processes, green up synthesis steps, and minimize formation of hazardous byproducts. Over the past twenty years, top journals have chronicled shifts in how labs approach halogenated esters like this: automated purification, greener solvents, and tighter process analytics aim to reduce the environmental and operational downsides. People working in these programs know that commercial adoption always lags behind the proof-of-concept stage, especially where safety or regulatory risk looms.
No compound with two chlorines gets a regulatory free pass, and methyl dichloroacetate has faced its share of scrutiny. Early case reports in the literature detailed effects on animal livers and kidneys at relatively high doses, prompting caution in both workplace and therapeutic settings. Chronic exposure studies raised questions about subtle metabolic impacts—often prompting biochemists to dig deeper into both its benefits and risks. Different regulatory bodies responded with occupational exposure limits to keep risks manageable in professional environments. Pharmaceutical teams studying potential clinical uses have outlined the need for controlled dosing and close monitoring, especially since halogenated compounds can affect mitochondrial function in unexpected ways. This balance of risk against potential benefit means that toxicologists are usually the first and last word in development projects involving this ester.
Methyl dichloroacetate sits on the edge of both old challenges and new opportunities. Greener chemistry has shifted expectations toward lower emissions, less persistent waste, and safer alternatives—so efforts to clean up its manufacture get attention from environmental chemists. Medical researchers see limited but real potential in applying derivatives as metabolic modulators, though regulatory hurdles mean slow progress. The market for fine chemicals and pharmaceutical intermediates keeps steady demand ticking over, especially as niche applications crop up requiring specific reactivity or structural motifs. Product stewardship has moved up the agenda for manufacturers, ensuring that supply chains track purity, safety and environmental impact more closely than in years past. Collaboration between industry, academic labs, and regulators holds the best promise for managing risks and finding new ways to tap the compound’s value without repeating past mistakes. In the years ahead, methyl dichloroacetate will either evolve along with new standards or find itself replaced by smarter, safer alternatives—its story is far from finished.
Methyl dichloroacetate sounds like something only folks in white coats need to worry about. Dig a little deeper and you’ll see it shows up in more places than you might expect. The chemical formula tells you two things: there’s a methyl group, and there’s chlorine attached to an acetate backbone. In short, it’s a clear liquid you run into in labs and in certain corners of manufacturing.
Chemists use methyl dichloroacetate to build more complicated molecules. You start with simple building blocks; this compound helps tack on two chlorines and a methyl group, kicking off reactions that lead to pharmaceuticals, pesticides, or specialty plastics. My old college lab kept a dusty bottle near the fume hood, tucked safely behind more glamorous compounds, but every year it made a cameo in tricky reactions. Its structure, with two chlorines, means it’s reactive but not explosively so—you can count on it to move reactions along without melting your bench. Specialty plastics and pharmaceutical ingredients, as well as flame retardant chemicals, sometimes start life in a reaction involving methyl dichloroacetate.
Outside the lab, methyl dichloroacetate gets involved in making solvents and intermediates. Factories with big stainless-steel vats pump it around to help produce chemicals that become everything from paint thinners to processing aids used in electronics. If you’ve ever handled electronics, you can thank compounds like these for purifying tiny chips and wires. In agriculture, it sometimes pops up in synthesis for herbicide or pesticide ingredients, thanks to its way of sticking to organic chains and helping control just how strong the active ingredient turns out.
No getting around it: this is not a chemical you want on your hands or in your lungs. The Environmental Protection Agency classifies dichloroacetates as substances to handle with care. During my brief stint as a chemical technician, I fumbled a bottle of something similar and learned the hard way that fumes from halogenated compounds linger in your clothes and irritate your eyes. Factories invest in air filtrations, goggles, and proper gloves because exposure can threaten workers’ health—dizziness, breathing problems, and even possible long-term risks if safety gets too loose.
Leaks and spills leave real marks. Waterways near industrial sites sometimes see run-off, and persistent chlorinated compounds can harm fish. Regulators in the United States and Europe keep pressure on plants to limit discharges and carry out regular monitoring. New research aims to break down these chemicals faster, using bioremediation and designer catalysts. Over the past decade I’ve watched growing calls for companies to publish their handling and disposal protocols. Shining a light on these steps helps keep communities safe and encourages better housekeeping throughout the supply chain.
Some newer processes move toward using less hazardous agents, or lock up the chlorine so it can’t escape. Green chemistry keeps pushing for swaps—finding reagents with shorter lifespans in the environment or better safety profiles. The jury’s still out on dropping chlorinated chemicals altogether, but the wave of regulation and customer demand for transparency keeps improvement moving forward. My work with startups in chemical engineering showed me that even small changes in reagent choice can ripple through procurement, storage, and disposal—every shift counts for safety and sustainability.
Methyl dichloroacetate comes up in chemistry labs more often than most folks outside the field might think. This clear liquid is used in research, including some early-stage cancer studies and industrial chemistry. Its sharp, almost biting odor gives you an immediate sense that it’s no gentle player. Handling it safely should never become an afterthought.
One spill on your skin will tell you all you need to know about how irritating methyl dichloroacetate can be. Skin contact stings and may cause redness or a rash—chemical burns aren’t out of the question after longer exposures. A splash in the eyes can leave lasting injury. Speaking from experience, lab coats, gloves made from nitrile, and a decent pair of goggles become essential gear instead of mere suggestions—especially for students new to organic chemistry labs.
Breathing its fumes feels like taking a deep breath near potent cleaning fluids. The inhalation risk is real, with symptoms like coughing, dizziness, or headaches. Chronic exposure could lead to much more serious problems with nerves and organs. These qualities separate methyl dichloroacetate from common solvents you might have handled in a garage workshop.
Methyl dichloroacetate evaporates quickly and forms flammable mixtures with air. Flammable vapors, especially close to hot surfaces or sparks, create dangers that can’t be shrugged off. Local universities have had more than one evacuation over careless chemical storage or open flames near volatile compounds.
Disposal takes its own careful planning—anyone who pours leftover methyl dichloroacetate down the drain risks polluting water supplies and harming aquatic life. Waste must head to a chemical collection facility, not the neighborhood landfill.
The United States Environmental Protection Agency labels chemicals in this class as hazardous substances. The Occupational Safety and Health Administration sets strict workplace exposure limits. These guidelines exist for good reason. Peer-reviewed literature and safety advisories from chemical societies consistently highlight its toxicity and volatility. That comes not just from animal studies, but from unfortunate accidents where lab workers faced acute symptoms during unprotected handling.
Simple routines help bring safety up to par. Always work in a fume hood with chemical-resistant gloves and safety goggles. Keep spill kits ready and check labels before even opening a bottle. Students and seasoned chemists keep to a checklist: gloves on hands, ventilation running, no eating or drinking anywhere in the lab. Training isn’t just for new hires—regular refreshers reduce the risk of oversight. Supervisors need to enforce the rules, not just post them.
On a larger scale, organizations should run annual safety audits. Equipment—ventilation, eyewash stations, fire extinguishers—needs regular inspection. Labeling every bottle clearly, using secondary containment, and keeping incompatible chemicals apart helps everyone go home at the end of the day. Spills require immediate cleanup with proper neutralizing agents and disposal measures laid out in Material Safety Data Sheets.
Treating methyl dichloroacetate with casual care leads down a risky road. Shortcuts and lapses create the right conditions for serious harm, and the science backing up these concerns leaves little room for debate. Careful respect for safety, strong habits, and serious oversight make all the difference in keeping this compound’s risks firmly in check.
Anytime you bring a new chemical into a lab or facility, storage turns into one of the big questions, and methyl dichloroacetate stands out as a good example of why people ought to pay attention. Over the years, I’ve seen what happens when storage gets sloppy or corners get cut—leaks, strange smells, sometimes far worse. A clear-cut approach matters for basic safety, for regulatory compliance, but also because many of us don’t get a second shot when a mistake happens with volatile chemicals.
Open a bottle of methyl dichloroacetate and you’ll notice a sharp, stinging smell right away. This stuff evaporates quickly and catches fire easily. There’s no debating the need for a cool, well-ventilated spot. I don’t stick it on a shelf next to anything flammable or near sunlight. Non-sparking, flame-proof storage cabinets should be the standard—no shortcuts. Every chemical safety training I’ve run drills the same priority: use tightly-sealed containers, preferably glass or high-grade plastic. Metal can cause reactions, and cheap plastics break down after enough exposure.
Humidity gives this compound trouble. Absorption of moisture from the air degrades methyl dichloroacetate and sometimes triggers unwanted chemical changes. Imagine fixing one leak only to find out water in the air has rusted the container shut or ruined your material. So, adding some desiccant packs inside the cabinet or using purpose-built chemical safes solves a good chunk of the moisture problem.
It’s tempting to think just shutting the bottle tight does the job, yet most dangerous incidents in my experience happen after a spill or container failure. Methyl dichloroacetate vapors can irritate your lungs and skin, so ventilation takes center stage. An exhaust fan or fume hood in the storage area protects workers, stops the room from turning into a hazard zone, and keeps the air clear. Ample signage helps too—nobody should reach for a bottle thinking it’s water or something less risky.
I always set up bright labels, hazard diamonds, and keep the safety data sheet nearby. New staff, experienced hands, or outside inspectors all spot what’s inside and which safety measures to follow. It sounds like basic protocol, but in emergencies, well-marked containers and simple instructions save time—and maybe lives.
OSHA doesn’t pull punches about hazardous materials. Fines stack up fast if regulations aren’t followed, and insurance companies refuse claims for incidents tied to bad storage. I’ve seen organizations land in legal battles or shut down for less. The right setup—a certified chemical cabinet, staff training, and proper documentation—protects everyone.
Regulations often mirror what practical experience already shows. Regular inventory audits catch expired or leaking containers. Safe disposal minimizes environmental risks. Emergency plans for spills or exposure matter much more than folks expect—having eyewash stations and spill kits nearby pays off. Prevention works better than treatment, as anyone who has dealt with a chemical accident will confirm.
Methyl dichloroacetate deserves the same respect as any dangerous reagent. Practical storage comes down to attitude as much as equipment. Treat every new drum or bottle like it’s a problem waiting to happen, and fewer mistakes crop up. I trust checklist routines and see fewer gray areas in training. Nobody benefits from taking risks with chemicals, and the right storage saves money, health, and even reputations in the long run.
Methyl dichloroacetate sounds like something buried in a chemistry textbook, but for folks working in labs or manufacturing, it shows up often enough to become a headache. This isn’t a chemical you want to take lightly—exposure can cause irritation, and long-term risks for workers handling it are real. Having spent years working near chemical storerooms, I have seen the importance of proper disposal get brushed aside until an inspector knocks on the door. No one wants that panic. The safe road always involves knowing local and federal rules. Tossing it down the drain? Illegal and dangerous. Pouring it into regular trash? Don’t even think about it.
Clean-ups get messy and costly fast. Methyl dichloroacetate qualifies as hazardous waste under U.S. Environmental Protection Agency (EPA) regulations. State agencies tend to tighten those rules even further. As someone who’s run waste manifests and managed hazardous containers, ignoring these rules brings fines or worse. Facility management needs team buy-in, so training isn’t just a yearly box to tick off. Each person handling chemicals deserves tools and know-how to keep themselves—and everyone nearby—safe. A simple slip, like storing a half-bottle under a fume hood instead of the proper drum, can leave a permanent stain on a safety record.
Once it comes time to toss methyl dichloroacetate, the process involves more than carrying it to a storage closet. Designated hazardous waste containers—labeled and sealed—should be the default. Closed-top drums or specialty jugs, all marked with type and risk, keep this stuff separated. Every worker needs to know the difference between a regular trash can and a hazardous collection bin. Don’t wait until things go wrong to sort through mishaps.
Disposal schedules also matter. Most organizations bring in licensed hazardous waste handlers to ferry the chemicals to compliant facilities. These specialists tackle neutralization, incineration, or advanced treatments which lock away the danger. For those of us in research or production, handing over the problem to the pros is smart—worries about groundwater or air quality drop off the list.
Scrambles over chemical waste have left neighbors angry and regulators handing out hefty penalties. Local water boards monitor for sudden spikes in contamination—catching violations traces back to one careless pour. Safety rules grew out of lessons from the past. People living nearby any facility trust that the ground and water will stay clean. That trust can break easily, and once gone, it drags down reputations for years.
It takes more than a sign on the wall. Regular audits reveal slip-ups before they snowball. Strong protocols, reinforced at weekly meetings, go far further than an annual video. Digital tracking tools help, logging every container picked up, moved, or discarded. After witnessing a company scramble due to outdated records, I’d never skip digital tracking again.
Everyone in the building, not just chemists, should feel comfortable bringing up concerns. Open talk about risks and sharing near-miss stories turn fear into practice. Invest in training and quality safety gear. No one should wonder what to do if a bottle cracks or a spill soaks into the countertop. When everyone owns their role in safe handling, accidents drop and the focus returns to the work that matters.
Methyl dichloroacetate packs quite a name for something so compact. Its chemical formula is C3H4Cl2O2. Kind of looks like a mouthful until you break it down: Three carbon atoms, four hydrogen atoms, two chlorine atoms, two oxygen atoms. This formula links to deeper topics we deal with every day: chemical safety, industrial use, and basic scientific literacy.
Chemical formulas like this don't just belong in a textbook. They give you the map you need to understand how a compound behaves. Methyl dichloroacetate shows up in labs thanks to its role as an ester. That structure shapes its reactivity, boiling and melting points, and interactions with other chemicals. If you miss a single atom in the formula, you end up with an entirely different compound, possibly something far more dangerous — or completely useless for your goal.
I’ve seen chemists stop a reaction mid-step because an ingredient was mislabeled. One wrong digit on a formula led to hours lost and dangerous fumes in the air. Anyone handling or studying this compound needs the right formula, not just for accuracy but for safety. Methyl dichloroacetate, with those chlorines, brings toxicity risks. OSHA points out the health risks tied to chlorinated compounds — these aren’t trivia topics; they’re on-the-job realities. Understanding the chemical structure shapes decisions about handling, storing, and even transporting materials safely.
I remember my first chemistry class, nervously tipping a beaker over a Bunsen burner. The teacher drove home the point: Chemistry starts with accurate information. Every element in that formula changes how something interacts with the environment and people. For example, those two chlorines change how methyl dichloroacetate dissolves in water and how it breaks down. That affects everything from disposal methods to personal protective equipment. Students and professionals make real-world choices based on formulas like C3H4Cl2O2, and those choices don’t sit on the sidelines.
Methyl dichloroacetate isn’t usually on the front page, but it brings real-world impact. Cleaning agents, paints, specialized solvents, and lab research all involve its kind of chemistry. The specifics might feel niche, but each formula connects to questions about health, environment, and product safety. Mistakes get expensive and dangerous fast. Even routine exposures to chlorinated esters tie into tighter regulations from government agencies like the EPA, which watches for compounds that linger or break down slowly.
The first step is easy: Insist on accuracy with chemical labeling and education. I’ve worked with teams who cut incidents by half after double-checking formula sheets and reviewing safety data before mixing anything. Open communication between supply, storage, and lab workers keeps everyone on the same page.
On a larger scale, backing scientific literacy early makes a difference. Community college courses and industrial training programs make formulas less intimidating, more second nature. Encouraging curiosity doesn’t just help the next chemist — it helps the next warehouse worker, teacher, and parent keep spaces safer. Through sharing real formulas, like methyl dichloroacetate’s C3H4Cl2O2, we move past memorization and into a stronger, more knowledgeable society.
| Names | |
| Preferred IUPAC name | Methyl 2,2-dichloroacetate |
| Other names |
Dichloroacetic acid methyl ester Methyl 2,2-dichloroacetate |
| Pronunciation | /ˈmɛθɪl daɪˌklɔːroʊəˈsiːteɪt/ |
| Identifiers | |
| CAS Number | 16630-55-0 |
| Beilstein Reference | 1720734 |
| ChEBI | CHEBI:141503 |
| ChEMBL | CHEMBL15439 |
| ChemSpider | 22555 |
| DrugBank | DB08311 |
| ECHA InfoCard | 03b7e6eb-0adf-4b18-b5fd-c33c92e68e81 |
| EC Number | 205-502-3 |
| Gmelin Reference | 5975 |
| KEGG | C18721 |
| MeSH | D003976 |
| PubChem CID | 14214 |
| RTECS number | PA8575000 |
| UNII | 13T1OD945S |
| UN number | UN2660 |
| Properties | |
| Chemical formula | C3H4Cl2O2 |
| Molar mass | 143.98 g/mol |
| Appearance | Colorless liquid |
| Odor | Sweet, pleasant |
| Density | 1.436 g/mL at 25 °C |
| Solubility in water | Soluble |
| log P | 0.84 |
| Vapor pressure | 13 mmHg (20°C) |
| Acidity (pKa) | 1.48 |
| Basicity (pKb) | pKb = 12.46 |
| Magnetic susceptibility (χ) | -10.36 × 10⁻⁶ cm³/mol |
| Refractive index (nD) | 1.412 |
| Viscosity | 0.62 cP (25°C) |
| Dipole moment | 2.24 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 329.1 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -542.9 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -693.7 kJ/mol |
| Pharmacology | |
| ATC code | D08AX04 |
| Hazards | |
| Main hazards | Harmful if swallowed, causes skin and eye irritation, may cause respiratory irritation |
| GHS labelling | GHS02, GHS07 |
| Pictograms | GHS05,GHS07 |
| Signal word | Warning |
| Hazard statements | H302, H312, H315, H319, H332 |
| Precautionary statements | P210, P261, P280, P305+P351+P338, P304+P340, P312, P337+P313 |
| NFPA 704 (fire diamond) | 2-2-0 |
| Flash point | Flash point: 70 °C |
| Autoignition temperature | 232°C |
| Lethal dose or concentration | LD₅₀ (oral, rat): 4700 mg/kg |
| LD50 (median dose) | 400 mg/kg (rat, oral) |
| NIOSH | PQ9350000 |
| PEL (Permissible) | PEL (Permissible Exposure Limit) of Methyl Dichloroacetate: "10 ppm (parts per million) as an 8-hour TWA |
| REL (Recommended) | 50-100 mg/L |
| IDLH (Immediate danger) | 50 ppm |
| Related compounds | |
| Related compounds |
Dichloroacetic acid Ethyl dichloroacetate Methyl chloroacetate Methylene chloride Acetyl chloride |