chemistry

Methyl trifluoromethanesulfonate

Methyl trifluoromethanesulfonate is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Methyl trifluoromethanesulfonate rather than just read about it. In short: Methyl trifluoromethanesulfonate, also commonly called methyl triflate and abbreviated MeOTf, is the organic compound with the formula CF3SO2OCH3. It is a colourless liquid which finds use in organic chemistry as a powerful methylating agent.

Key takeaways

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

Reference excerpt

Methyl trifluoromethanesulfonate, also commonly called methyl triflate and abbreviated MeOTf, is the organic compound with the formula CF3SO2OCH3. It is a colourless liquid which finds use in organic chemistry as a powerful methylating agent. The compound is closely related to methyl fluorosulfonate (FSO2OCH3). Although there has yet to be a reported human fatality, several cases were reported for methyl fluorosulfonate (LC50 (rat, 1 h) = 5 ppm), and methyl triflate is expected to have similar toxicity based on available evidence.

Synthesis Methyl triflate is commercially available, however it may also be prepared in the laboratory by using dimethyl sulfate to methylate triflic acid.

CF3SO2OH + (CH3O)2SO2 → CF3SO2OCH3 + CH3OSO2OH

Reactivity

Hydrolysis Upon contact with water, methyl triflate loses its methyl group, forming triflic acid and methanol:

CF3SO2OCH3 + H2O → CF3SO2OH + CH3OH

Methylation One ranking of methylating agents is (CH3)3O+ > CF3SO2OCH3 ≈ FSO2OCH3 > (CH3)2SO4 > CH3I. Methyl triflate will alkylate many functional groups which are very poor nucleophiles such as aldehydes, amides, and nitriles. It does not methylate benzene or the bulky 2,6-di-tert-butylpyridine. Its ability to methylate N-heterocycles is exploited in certain deprotection schemes.

Cationic polymerization Methyl triflate initiates the living cationic polymerization of lactide and other lactones including β-propiolactone, ε-caprolactone and glycolide.

Cyclic carbonates like trimethylene carbonate and neopentylene carbonate (5,5-dimethyl-1,3-dioxan-2-one) can be polymerized to the corresponding polycarbonates. 2-alkyl-2-oxazolines, for example 2-ethyl-2-oxazoline, are also polymerized to poly(2-alkyloxazoline)s.

Applications

Radiochemistry Carbon-11 methyl triflate ([11C]MeOTf), or methyl triflate containing the carbon-11 isotope, is commonly used in radiochemistry to synthesize radioactively labeled compounds that can be traced in living organisms using positron emission tomography (PET). For example, [11C]MeOTf has been used extensively in the production of Pittsburgh Compound B, which first allowed β-amyloid plaques to be imaged in a living brain.

Illustrations

Worked examples

Example 1 — a first encounter with Methyl trifluoromethanesulfonate

Start with the simplest possible case. Write down what Methyl trifluoromethanesulfonate 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 Methyl trifluoromethanesulfonate 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 Methyl trifluoromethanesulfonate 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 Methyl trifluoromethanesulfonate

In research: Methyl trifluoromethanesulfonate 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 Methyl trifluoromethanesulfonate 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: Methyl trifluoromethanesulfonate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Methyl esters, Methylating agents, Organic compounds with 2 carbon atoms, so understanding it makes those chapters shorter.
In everyday life: Look for Methyl trifluoromethanesulfonate 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Methyl trifluoromethanesulfonate” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Methyl trifluoromethanesulfonate in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Methyl trifluoromethanesulfonate 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 Methyl trifluoromethanesulfonate out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Methyl trifluoromethanesulfonate in simple terms?

Why does Methyl trifluoromethanesulfonate 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 Methyl trifluoromethanesulfonate?

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 Methyl trifluoromethanesulfonate.