Glycol ethers

Key takeaways

Glycol ethers belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Glycol ethers to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Glycol ethers from memory before moving on to harder problems.

Reference excerpt

Glycol ethers are a class of chemical compounds consisting of alkyl ethers that are based on glycols such as ethylene glycol or propylene glycol. They are commonly used as solvents in paints and cleaners. They have good solvent properties while having higher boiling points than the lower-molecular-weight ethers and alcohols.

History The name Cellosolve was registered in 1924 as a United States trademark by Carbide & Carbon Chemicals Corporation (a division of Union Carbide Corporation) for "Solvents for Gums, Resins, Cellulose Esters, and the Like". Ethyl Cellosolve, or simply Cellosolve, consists mainly of ethylene glycol monoethyl ether and was introduced as a lower-cost solvent alternative to ethyl lactate. Butyl Cellosolve (ethylene glycol monobutyl ether) was introduced in 1928, and Methyl Cellosolve (ethylene glycol monomethyl ether) in 1929.

Types Glycol ethers are designated E-series or P-series for those made from ethylene oxide or propylene oxide, respectively. Typically, E-series glycol ethers are found in pharmaceuticals, sunscreens, cosmetics, inks, dyes and water-based paints, while P-series glycol ethers are used in degreasers, cleaners, aerosol paints and adhesives. Both E- and P-series glycol ethers can be used as intermediates that undergo further chemical reactions, producing glycol diethers and glycol ether acetates. P-series glycol ethers are marketed as having lower toxicity than the E-series.

Health impacts

Most glycol ethers are water-soluble, biodegradable and only a few are considered toxic. In the early 1990s, studies found a higher than expected rates of human reproductive health issues in both males and females, such as elevated risk of miscarriages among women who worked in semiconductor plants as well as male gonadal changes such as testicular atrophy and sperm morphology changes, which was traced back to glycol ethers; in particular: ethylene glycol ethers (diethylene glycol dimethyl ether or ethylene glycol monoethyl ether acetate) used in the photoresist substances that coat semiconductors. One study suggests that occupational exposure to glycol ethers is related to lowering the motility of the sperm and sperm count, a finding disputed by the chemical industry.

Subclasses

Monoalkyl ethers Ethylene glycol monomethyl ether (2-methoxyethanol, CH3OCH2CH2OH) Ethylene glycol monoethyl ether (2-ethoxyethanol, CH3CH2OCH2CH2OH) Ethylene glycol monopropyl ether (2-propoxyethanol, CH3CH2CH2OCH2CH2OH) Ethylene glycol monoisopropyl ether (2-isopropoxyethanol, (CH3)2CHOCH2CH2OH) Ethylene glycol monobutyl ether (2-butoxyethanol, CH3CH2CH2CH2OCH2CH2OH), a widely used solvent in paintings and surface coatings, cleaning products and inks Ethylene glycol monophenyl ether (2-phenoxyethanol, C6H5OCH2CH2OH) Ethylene glycol monobenzyl ether (2-benzyloxyethanol, C6H5CH2OCH2CH2OH) Propylene glycol methyl ether, (1-methoxy-2-propanol, CH3OCH2CH(OH)CH3) Diethylene glycol monomethyl ether (2-(2-methoxyethoxy)ethanol, methyl carbitol, CH3OCH2CH2OCH2CH2OH) Diethylene glycol monoethyl ether (2-(2-ethoxyethoxy)ethanol, carbitol cellosolve, CH3CH2OCH2CH2OCH2CH2OH) Diethylene glycol mono-n-butyl ether (2-(2-butoxyethoxy)ethanol, butyl carbitol, CH3CH2CH2CH2OCH2CH2OCH2CH2OH) Dipropyleneglycol methyl ether C12-15 pareth-12 a polyethylene glycol ether used as an emulsifier in cosmetics

Dialkyl ethers Ethylene glycol dimethyl ether (dimethoxyethane, monoglyme, CH3OCH2CH2OCH3), a higher boiling alternative to diethyl ether and THF, also used as a solvent for polysaccharides, a reagent in organometallic chemistry and in some electrolytes of lithium batteries Diethylene glycol dimethyl ether (1-Methoxy-2-(2-methoxyethoxy)ethane, diglyme, CH3OCH2CH2OCH2CH2OCH3) Triethylene glycol dimethyl ether (2,5,8,11-Tetraoxadodecane, triglyme, CH3OCH2CH2OCH2CH2OCH2CH2OCH3) Tetraethylene glycol dimethyl ether (2,5,8,11,14-Pentaoxapentadecane, tetraglyme, CH3OCH2CH2OCH2CH2OCH2CH2OCH2CH2OCH3) Ethylene glycol diethyl ether (diethoxyethane, CH3CH2OCH2CH2OCH2CH3) Ethylene glycol dibutyl ether (dibutoxyethane, CH3CH2CH2CH2OCH2CH2OCH2CH2CH2CH3)

Esters Ethylene glycol methyl ether acetate (2-methoxyethyl acetate, CH3OCH2CH2OCOCH3) Ethylene glycol monoethyl ether acetate (2-ethoxyethyl acetate, CH3CH2OCH2CH2OCOCH3) Ethylene glycol monobutyl ether acetate (2-butoxyethyl acetate, CH3CH2CH2CH2OCH2CH2OCOCH3) Propylene glycol methyl ether acetate (1-methoxy-2-propanol acetate)

References

Worked examples

Example 1 — a first encounter with Glycol ethers

Start with the simplest possible case. Write down what Glycol ethers claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Glycol ethers before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Glycol ethers ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Glycol ethers

In research: Glycol ethers appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Glycol ethers in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Glycol ethers is common in secondary-school and first-year university syllabi. It links to neighbouring topics Commodity chemicals, Glycol ethers, so understanding it makes those chapters shorter.
In everyday life: Look for Glycol ethers outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study Glycol ethers in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Glycol ethers means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Glycol ethers out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Glycol ethers in simple terms?

Glycol ethers are a class of chemical compounds consisting of alkyl ethers that are based on glycols such as ethylene glycol or propylene glycol. They are commonly used as solvents in paints and cleaners.

Why does Glycol ethers matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Glycol ethers?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Glycol ethers.