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1,2-Bis(2-Chloroethoxy)Ethane: Commentary on Its Evolution, Application, and Future

Historical Development

Chemistry has delivered an immense toolkit to industry, and 1,2-Bis(2-Chloroethoxy)Ethane stands as one of those versatile molecules that shows up across different periods of synthetic chemistry. Decades ago, when polymer science and specialty materials came into their own, manufacturers and researchers alike looked for intermediates with robust reactivity and manageable handling requirements. Memory recalls lab benches cluttered with glassware and an endless chase for reagents that offered both specificity and robustness. This compound became a popular favorite in the realm of functionalized ethylene derivatives. Its early adoption in the production of specialty polymers and resins was driven by a need for molecules that bring flexibility to synthesis, especially when cross-linking or introducing reactive chlorinated sites.

Product Overview

To the uninitiated, 1,2-Bis(2-Chloroethoxy)Ethane may sound arcane, a string of chemical syllables best left to desks lined with calculators. In practice, it serves as much more than an abstract formula on a datasheet. Production teams appreciate its predictable behavior in batch reactions, while researchers continually explore modifications that build on its twin chloroethoxy arms. In my experience, this molecule often rides the line between desired chemical reactivity and manageable physical attributes. Chemists use it to introduce reactive sites for further derivatization or as a deliberate, measured building block in larger chemical synthesis routes, particularly in the field of custom molecules for industrial polymers and specialty coatings.

Physical & Chemical Properties

Experience in the lab reveals that this compound comes across as a clear, nearly colorless liquid, which eases preliminary identification. Its molecular structure featuring two chloroethoxy groups tethered to an ethane core gives it a moderate boiling point and a certain stability under standard storage. Solubility trends show affinity for organic solvents but limited miscibility with water, a feature both beneficial and challenging during process separations. Its chlorinated nature influences both its reactivity and its precautions—adding potential routes for alkylation but calling for decent respect for toxicological exposure.

Technical Specifications & Labeling

Labels on chemical drums or bottles tell more than regulatory compliance stories; they hint at decades of standardization and the ongoing demand for safety. Analytical reports for 1,2-Bis(2-Chloroethoxy)Ethane, which I have often reviewed for quality assurance, typically focus on purity percentages, acidity, and water content. Most labs ask for specifications that reflect modern expectations for analytical rigor. Repeated exposure to the compound in quality-driven environments has reinforced the lesson that clear labeling and precise tracking—batch numbers, CAS registration, and concentration details—build confidence across supply chains, especially when operators rely on standardized stock for scale-up processes.

Preparation Method

Few things reveal the march of chemical progress as much as refining synthesis pathways. Early literature lists a straightforward approach: starting from ethylene glycol, reacting with excess thionyl chloride or similar chlorinating agents, and then linking via Williamson ether synthesis. Over years in process chemistry, reaction optimization has become more about maximizing yield while minimizing by-products, especially those that complicate downstream purification. Industry also pays more attention to waste disposal and environmental regulation—catalyzing a shift toward greener and more selective chlorination methods. The drive for safer, higher-yield preparation runs parallel to pressures from regulatory bodies keen on limiting chlorinated waste streams.

Chemical Reactions & Modifications

This compound’s two chloro-terminated chains set the stage for nucleophilic substitutions and further modifications. Chemists leverage these features for creating segmental copolymers, or for introducing heteroatoms by substitution reactions. Personal experience points to its use as a core intermediate, often linking organic frameworks or introducing branching through alkylation, etherification, or even ring closure under certain conditions. This flexibility means that 1,2-Bis(2-Chloroethoxy)Ethane is a workhorse when developing advanced intermediates for custom syntheses, especially in the fine chemicals and pharmaceuticals sectors.

Synonyms & Product Names

Naming conventions tend to trip up newcomers to any field. Across industry literature and catalogs, the compound appears as Bis(beta-chloroethoxy)ethane, beta,beta'-Dichlorodiethylether, or even under simplified labels like BCEE. Each name reflects a different heritage, with textbooks, patent filings, and supply chains favoring one over the other depending on regional or institutional precedent. This variability sometimes slows procurement or confuses researchers unfamiliar with a synonym-heavy landscape, but standardized CAS numbers help resolve most ambiguities.

Safety & Operational Standards

Safety deservedly dominates discussions whenever handling chlorinated organics. Over years supervising and training lab users, I learned quickly that the halogenated nature of 1,2-Bis(2-Chloroethoxy)Ethane brings both opportunity and risk. Skin exposure and inhalation pose real hazards; gloves, goggles, and fume hoods have always sat at the top of the checklist. Ventilation and spill protocols aren’t just bureaucratic—they come from real-world incidents and a shared desire to get home without consequence. Data from regulatory bodies back up this caution, flagging the compound for possible irritation or longer-term toxicity effects.

Application Area

From personal encounters with research and industry teams, this chemical most often finds itself at the crossroads of polymer science and specialty surface modification. Its role in making polyethers, high-performance lubricants, and reactive diluents keeps it on inventory lists for large chemical plants. Research teams appreciate its adaptability in synthesizing molecules that demand both flexibility and reactivity, a feature cherished in projects focused on new coatings, adhesives, and sometimes pharmaceutical agents. As projects scale, technical staff and supply chain managers look to this molecule for its predictable output and straightforward handling, which allows parallelized production.

Research & Development

Investment in R&D has kept 1,2-Bis(2-Chloroethoxy)Ethane relevant far past its debut. Ongoing efforts strive to limit chlorinated waste and improve both atom economy and process safety. From time in the lab, I’ve seen both successes and setbacks—higher yields sometimes bring trickier purification challenges, and every tweak in the process opens new opportunities for improvement. Specialists in green chemistry trailblaze safer reagents for chlorination steps, aiming at scalable, less hazardous approaches. On the analytical front, improved detection methods for contaminants or by-products keep pushing the envelope for purity and safety.

Toxicity Research

Research into toxicology shows the careful balancing act that chemicals like this demand. Animal and cellular studies have recorded concerns about exposure, both acute and chronic. Regulatory updates and academic inquiries prompt regular reviews of exposure limits and safety data sheets. Colleagues in industrial hygiene stress clear communication about risks and necessary controls, from basic PPE to more involved ventilation and engineering controls. Risks of overexposure—either by contact or inhalation—never stay theoretical for long. Incidents and near-misses keep safety training grounded in reality, a lesson companies re-learn every time a new hire joins the team.

Future Prospects

Looking forward, the future of 1,2-Bis(2-Chloroethoxy)Ethane ties closely to the fate of specialty synthesis and the relentless drive for safer, cleaner chemical manufacturing. Environmental pressures grow as regulations tighten on both production and downstream handling of chlorinated intermediates. Green chemistry initiatives will play a bigger part, aiming for alternative chlorination strategies and even replacement molecules that deliver the same synthetic flexibility with reduced environmental impact. Specialty applications—tailored polymers, smart adhesives, and targeted intermediates for advanced materials—will continue to keep this compound relevant. Its ongoing utility stands as a testament to chemistry’s capacity for evolution, adaptation, and the determined pursuit of solutions that balance innovation and responsibility.




What is the chemical formula of 1,2-Bis(2-Chloroethoxy)Ethane?

Getting Straight to the Heart of the Compound

Chemistry can look intimidating on paper, but most compounds tell their story through structure. Take 1,2-Bis(2-Chloroethoxy)ethane. Its name pulls apart easily for those who have ever mixed household cleaners or fixed a bike chain with basic solvents. This molecule has two ethoxy groups, both holding two-carbon chains, joined by an ethane backbone, and each of those ethoxy arms grabs a chlorine atom. Its chemical formula is C6H12Cl2O2.

Why Structure Matters

People rarely talk about obscure compounds unless they show up in industry, lab work, or the environment. Here, the presence of two chlorine atoms on flexible ether linkages raises flags and possibilities. Chlorinated hydrocarbons carry heft; they can stick around, resist simple breakdown, and sometimes pose risks to air, water, and health. The structure packs potential for reactivity and persistence. Experiences in industrial chemistry laboratories have shown that ethers like these can slip through standard water treatment steps and migrate from spills into the soil or air.

Factoring in Real-World Impact

Chemists and environmental workers have traced patterns between chemical structure and environmental fate. Those chlorine atoms often slow breakdown by bacteria or sunlight. Ethers add another hurdle, confusing natural enzymes. According to EPA data, similar chlorinated ethers have turned up in groundwater near manufacturing sites, sparking expensive cleanups and stricter safety standards.

Chemical properties aren’t just trivia. The structure of 1,2-Bis(2-Chloroethoxy)ethane creates value in flexible coatings and specialty solvents but also demands respect. I once worked in a lab formulating polymers, and a single spill of a similar compound lingered in the air for hours. This kind of persistence is what drives scientists and regulators to take a closer look at storage, handling, and disposal practices.

Supporting Informed Decisions Through Careful Management

Care around chlorinated ethers begins at the point of synthesis. Factories track inventories tightly because of high regulatory costs and potential hazards. Proper labeling, airtight containers, and controlled access keep both workers and the community safe. Emergency response plans include detailed information to deal with contamination, fire, or accidental release.

Technology provides help. Carbon filters, ultraviolet breakdown, and incineration target compounds with this kind of structure. Companies that value community relations work with local authorities to test water and soil, even when laboratory analysis gets expensive. Sharing information openly—something more effective than legal minimums—builds trust.

Pushing for Climate and Health-Smart Choices

Chlorinated organic compounds press the need for smarter choices across industry. The formula of 1,2-Bis(2-Chloroethoxy)ethane marks it as both useful and a candidate for stricter oversight. Developing safer substitutes for jobs like degreasing, solvent extraction, or synthesis helps limit risk. Plant managers back research on greener alternatives by funding university partnerships, which encourages real innovation beyond regulations.

Every step, from research benches to warehouses, shapes the legacy of these compounds. Responsible chemistry isn’t just rule-following—it grows from seeing the connection between a single molecule's formula and the world outside the lab. Real improvements happen when everyone in the chain—scientist, worker, neighbor—has a say in how these chemicals show up in daily life.

What are the primary uses or applications of 1,2-Bis(2-Chloroethoxy)Ethane?

What It Means for Industry

Factories and labs don’t always get the spotlight, but much of what puts goods on shelves and essentials on workbenches starts with basic chemical compounds. Among them, 1,2-Bis(2-Chloroethoxy)Ethane works as a quiet, behind-the-scenes player. This chemical turns up in places you wouldn’t expect, which says something about how deeply it’s woven into making modern life run.

You’ll find this compound in the toolbox for building other chemicals. Sitting in a row of bottles in the lab, it looks no different from any other clear liquid. In reality, it acts as a building block. When chemists want to make certain specialty polymers or pharmaceutical intermediates, they often start with something like 1,2-Bis(2-Chloroethoxy)Ethane. Its structure—with the two chlorine atoms and an ethylene chain—lets it be a good target for reactions that swap out the chlorine for other groups. That means it isn’t just sitting idle; it tends to be at the core of each new batch of tailored chemicals.

Breaking It Down in Practice

People working on new drugs or tweaking existing ones might use 1,2-Bis(2-Chloroethoxy)Ethane as a linker. Some drugs work better or get absorbed faster if certain parts of their molecules connect through a bridge like this. I’ve seen colleagues use it to connect two separate molecules, making an entirely new compound that wouldn’t have held together otherwise. The idea is to get the best of both worlds—a flexible solution that binds stronger or works longer in the system.

In industry, particularly where solvents or specialty coatings come into play, this chemical moves things along as both a tool and an ingredient. Factories making anti-static agents or lubricants, for example, pick up 1,2-Bis(2-Chloroethoxy)Ethane for its dual reaction points. Those points make it easier to weave longer molecules together or to add functional side-chains. The upshot is better performance—maybe a lubricant that lasts longer under pressure, or an anti-static agent that doesn’t wash off so easily.

Managing Risks

Big gains in chemistry sometimes mean big challenges for health and the environment. Nobody wants factory workers breathing in unstable vapors or rivers choked with byproducts. 1,2-Bis(2-Chloroethoxy)Ethane brings both value and risk. The industry keeps a close watch on exposure, thanks to safety guidelines set by authorities like OSHA or the EPA. There’s no escaping the care it takes to store and handle this substance. Proper ventilation, gloves, goggles—they all come standard.

On the bright side, it’s possible to cut waste and manage emissions with careful engineering and upgraded processes. Many facilities now recycle their solvents, or capture byproducts before they get out into the air or water. A friend once switched her lab from open handling to closed systems, and their air quality numbers improved overnight. Moving in this direction doesn’t just help the workers; it helps the neighborhoods they call home.

Looking Forward

Science asks for better, safer, and more efficient materials every year. Companies keep searching for ways to keep what works about 1,2-Bis(2-Chloroethoxy)Ethane while minimizing the downsides. Finding alternatives or improving recycling strategies can only help. At the end of the day, it’s got a secure role because it solves problems that nothing else quite does. Still, it pays to keep improving, both for the people involved and for the planet we share.

What safety precautions should be taken when handling 1,2-Bis(2-Chloroethoxy)Ethane?

Recognizing Real Hazards

A chemical like 1,2-Bis(2-Chloroethoxy)Ethane rarely sits on a shelf by accident. It carries risks that can knock the careless sideways. When working in a lab, I learned pretty quickly that even one tiny spill of a chlorinated ether could land me in the medical office with a headache and a lecture. This substance gives off fumes that can irritate lungs, eyes, and skin. Direct contact sticks around—red patches, peeling, and eye stinging rush in fast.

Ventilation Can Never Wait

No chemical needs fresh air more. Strong local exhaust makes a difference. Even with the right gloves, masks, and lab coats, I make sure those fume hoods are humming. Once, I saw someone pour a solution outside the hood, thinking it wasn’t much—a minute later, everyone downwind coughed and reached for the eyewash. Protecting your lungs always comes first. Fresh airflow and fume extraction help everyone work in the clear.

Choosing Real Protective Gear

Non-negotiable: always put on gloves that keep out organic solvents—nitrile or neoprene, not convenience-store latex. Face shields matter just as much as goggles because splashes do more than sting. I learned from an old-timer in the field to double up on protection, and he was right. One forgotten sleeve, and there goes a week of scratching and ointment. Chemical-resistant aprons and closed-toe shoes keep your skin from paying the price.

Labeling and Storage Prevent Trouble

At a busy bench, someone once refilled a plain bottle with what they thought was harmless buffer. Turned out they grabbed 1,2-Bis(2-Chloroethoxy)Ethane. Accidents like that make clear labeling crucial. A label should include not just the name, but a bold hazard warning and the date. Good storage rules keep this chemical tucked away from heat, open flames, or oxidizers. Locking cabinets and climate control are worth the extra minute. There’s no shortcut to peace of mind.

Be Ready to Clean Spills—Not to Panic

Sooner or later a beaker tips. The key is a plan. Spill kits with neutralizer, absorbent pads, and plenty of gloves live at arm’s reach in my workspace. If a drop lands somewhere it shouldn’t, I shut off the source, clear the area, and suit up. Cleaning without the right tools means spreading the mess and raising the risk.

Respect Means Following the Rules

Reading the safety data sheet sounds basic, but too many folks put it off. I set aside time before I open a fresh bottle. The manufacturer’s guidelines go into detail about disposal—you can’t just toss leftovers down the drain without breaking both rules and pipes. I send waste to a proper disposal site each week with full documentation, so nothing comes back to haunt the department.

Training: Not Just for Newcomers

Everyone on the team, from interns to managers, gets a walk-through—no exceptions. We practice emergency eye washes and shower runs like fire drills. No one rolls their eyes; everybody hears stories that stick. Surprises in the lab usually happen when collective memory grows dull and shortcuts look tempting.

Staying Ahead of Mistakes

Working with chemicals that can do real harm isn’t about paranoia. It’s about respect, vigilance, and sometimes sharing a lesson learned the hard way. Good habits mean safer outcomes. Training, equipment, and solid routines keep dangerous compounds from turning a workday into a disaster.

How should 1,2-Bis(2-Chloroethoxy)Ethane be stored?

Straight Talk: Why Storage Matters

Anyone who handles chemicals like 1,2-Bis(2-Chloroethoxy)Ethane knows storage shouldn’t be an afterthought. In industry, safety often depends on choices made at the storage stage. If you don’t take this seriously, the risks aren’t just inconvenience or wasted material—they extend to real harm: toxic fumes, fire hazards, maybe even long-term health issues. Watching a safety bulletin get issued after a poor storage mishap makes a strong impression.

Physical and Chemical Realities

This compound brings its own quirks. Clear, dense liquid, with a faintly sweet odor that doesn’t announce itself loudly but means business. It won’t explode if looked at wrong, but heat and moisture reveal its hazardous side. Stores I’ve worked in always keep these kinds of chlorinated ethers away from sunlight, heat, and any possible ignition source. Direct sun can warm even concrete rooms in summer. Desks or benches near windows are a terrible place for this chemical. Set it near anything that can spark and risk increases a hundredfold. Even a nearby forklift’s hot engine could tip things in the wrong direction.

Best Setup for Storage

The simple route—solid, sealed containers, labeled right and built to deal with chemicals that like reacting. Metal drums invite corrosion, especially if moisture finds a way in, so I've seen high-density polyethylene containers used most. They don’t rust, stand up to accidental knocks, and seal up tight. Lids and closures matter as much as the walls; dripping or sweating containers are a red flag nobody wants in their storeroom. An absorbent spill mat underneath adds a reassuring layer of protection.

Keep this compound at a cool, stable temperature—below ambient warmth when possible, but above freezing. Storage rooms I trust pay close attention to the thermometer. Air moves well, extraction fans keep vapors from building up, and access is limited to trained staff. Tall shelves can seem convenient, but low, front-facing shelving is far safer. If someone trips or has to act quickly during a leak, containers and safety gear are all grab-and-go.

Clear Labeling and Security

Labels matter, and I’ve seen trouble come from faded or missing tags. Anyone storing this kind of chemical should use clear hazard symbols and large print. Emergency numbers and instructions stay posted nearby, with both paper copies and digital backups. A separate logbook lists who took what, and the quantities used, creating accountability and helping spot problems before they grow.

Protecting People, Equipment, and the Environment

No one wants an accidental release. Liquid chlorinated ethers can seep into surfaces and react with pipes, wiring, or floor coatings. Secondary containment trays stop drips from traveling, acting like a moat around each storage row. Gloves, goggles, and aprons protect the handler, but smell can warn that something’s gone wrong even before instruments register a leak. Keeping a dedicated ventilation hood and eyewash station nearby shows respect not just for regulations but for the people clocking in each day.

Looking Ahead: Solutions That Stick

Routine inspections cut down on “set it and forget it.” Too many incidents start with the idea that once a chemical enters a cabinet, it just waits safely. Instead, maintenance teams check for swelling, corrosion, telltale odors, and always test spill response gear. Automated inventory systems track shelf life and trigger timely reminders for disposal.

Rigorous documentation and steady training sessions make a real difference. Whole teams stay up-to-date, and new folks learn about both risks and the best ways to avoid trouble. That’s how you keep accidents uncommon and build trust in the people and systems guarding your workspace.

What are the potential health hazards associated with exposure to 1,2-Bis(2-Chloroethoxy)Ethane?

What Makes This Chemical Worrisome

1,2-Bis(2-Chloroethoxy)ethane doesn’t have a name that rolls off the tongue or jumps out at most people, but that doesn’t make it harmless. In the workplace and in communities near manufacturing facilities, the dangers tied to this industrial chemical grow more concerning once you take a closer look. Often used as a plasticizer, intermediate, or solvent, this compound brings with it several clear health risks.

The Pathways to the Body

People typically face exposure at work. Breathing in vapors during handling, catching liquid on the skin, or even getting it in the eyes—these are how it enters the body. I remember walking past drums of chemical solvents years ago in a warehouse, the smell sometimes strong enough to sting, and nobody ever really explained what those chemical labels meant. Workers in chemical plants face the effects more directly, especially when engineering controls lag behind, or gloves and masks stay in lockers.

Direct Health Effects

Short-term contact with 1,2-Bis(2-Chloroethoxy)ethane can irritate skin, eyes, and throat. Nosebleeds or coughing could signal exposure. Workers sometimes report fatigue, headaches, or trouble concentrating—not just nuisances, but signs the nervous system starts feeling the impact. Studies from the National Institute for Occupational Safety and Health (NIOSH) have noted chloroethoxy compounds trigger dizziness and nausea even at low doses. Over longer stretches, these chemicals can do harsher damage.

Cancer and Chronic Risks

Research on 1,2-Bis(2-Chloroethoxy)ethane shows the real worry comes with long-term exposure. Animal studies from the EPA and toxicology databases highlight risks for liver and kidney damage. Mutagenic properties—where a chemical changes DNA—put cancer on the table. OSHA and IARC both flag chlorinated ethers as possible carcinogens. Factory workers decades ago, for instance, often handled chemicals like this with little protection and paid the price years later, developing cancers or organ disease.

Communities at the Fence Line

It’s not just workers at risk. Manufacturing plants sometimes release small quantities into water or air. Even tiny leaks into groundwater over time could reach neighborhoods. People living near these factories have no choice but to rely on regulators and companies for protection. Growing up close to an industrial park made me worry about odd smells drifted over our yard at night. Parents always wondered if the headaches or allergies so common on our end of town had roots in that constant chemical tang.

Pushing for Solutions

Basic fixes exist. Tougher enforcement of exposure limits, regular workplace monitoring, and real investment in protective gear protect employees. Spill management and ventilation upgrades limit routine leaks. Outside the plant, community right-to-know laws, strict water and air monitoring, and rapid reporting of spills keep people informed and safer. Most importantly, shifting to greener chemicals or safer processes drops risks to near zero. It comes down to transparency, accountability, and personal vigilance—from the factory floor to the neighborhood next door.

Facts Still Matter

The more you learn about chemicals like 1,2-Bis(2-Chloroethoxy)ethane, the clearer it gets that trusted information and strong protections lag behind real risks for many workers. Facts push companies and regulators to do better. Health truly comes before convenience, and speaking up for clear air and safe jobs shouldn’t have to wait for someone to get sick.

1,2-Bis(2-Chloroethoxy)Ethane
1,2-Bis(2-Chloroethoxy)Ethane
1,2-Bis(2-Chloroethoxy)Ethane
Names
Preferred IUPAC name 2,2'-Dichloroethyl oxyethane
Other names Diethylene glycol dichloride
Bis(2-chloroethyl) ether
Ethane, 1,2-bis(2-chloroethoxy)-
Dichlorodiethylene ether
Pronunciation /ˈwʌn tuː bɪs tuː ˌklɔːroʊˈɛθɒksi ˈɛθeɪn/
Identifiers
CAS Number 111-91-1
Beilstein Reference 1718737
ChEBI CHEBI:81937
ChEMBL CHEMBL52990
ChemSpider 7281
DrugBank DB14015
ECHA InfoCard 03a51c45-0568-4e55-bbe7-9a0817c2bdf9
EC Number 203-944-7
Gmelin Reference 8095
KEGG C19617
MeSH D016696
PubChem CID 8232
RTECS number KH8575000
UNII Q44FX5J774
UN number UN2527
CompTox Dashboard (EPA) DTXSID3023722
Properties
Chemical formula C6H12Cl2O2
Molar mass 187.07 g/mol
Appearance Colorless liquid
Odor Odorless
Density 1.251 g/cm³
Solubility in water slightly soluble
log P 0.9
Vapor pressure 0.0085 mmHg (25°C)
Acidity (pKa) 14.5
Basicity (pKb) pKb = 4.01
Refractive index (nD) 1.487
Viscosity 26.16 mPa·s at 25°C
Dipole moment 2.19 D
Thermochemistry
Std molar entropy (S⦵298) 380.6 J·mol⁻¹·K⁻¹
Std enthalpy of formation (ΔfH⦵298) -393.1 kJ/mol
Std enthalpy of combustion (ΔcH⦵298) -1480.8 kJ/mol
Hazards
Main hazards Harmful if swallowed, causes serious eye irritation, causes skin irritation
GHS labelling GHS02, GHS07
Pictograms GHS06,GHS08
Signal word Warning
Hazard statements H302, H315, H319, H332
Precautionary statements P261, P264, P273, P280, P301+P312, P305+P351+P338, P337+P313, P330, P501
NFPA 704 (fire diamond) 1,2-2-0
Flash point 143°C
Autoignition temperature 210°C
Explosive limits Explosive limits: 1.3–7.8%
Lethal dose or concentration LD50 oral rat 149 mg/kg
LD50 (median dose) LD50 (median dose): 140 mg/kg (Oral, Rat)
NIOSH KK8225000
REL (Recommended) 10 mg/m3
IDLH (Immediate danger) 50 ppm
Related compounds
Related compounds Bis(2-chloroethyl) ether
1,2-Bis(2-bromoethoxy)ethane
1,2-Bis(2-chloroethoxy)propane
1,2-Dichloroethane
Diethylene glycol
Bis(2-chloroethoxy)methane