chemistry

Trifluoromethyltrimethylsilane

Trifluoromethyltrimethylsilane 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 Trifluoromethyltrimethylsilane rather than just read about it. In short: Trifluoromethyltrimethylsilane (known as Ruppert-Prakash reagent, TMSCF3) is an organosilicon compound with the formula CF3Si(CH3)3. It is a colorless liquid.

Key takeaways

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

Reference excerpt

Trifluoromethyltrimethylsilane (known as Ruppert-Prakash reagent, TMSCF3) is an organosilicon compound with the formula CF3Si(CH3)3. It is a colorless liquid. The compound is a reagent used in organic chemistry for the introduction of the trifluoromethyl group.

History The compound was first prepared in 1984 by Ingo Ruppert It was further developed as a reagent by G. K. Surya Prakash, who reported activation of TMSCF3 by fluoride to perform nucleophilic trifluoromethylation of carbonyl compounds. In the same year, Stahly described similar reactions for the synthesis of trifluoromethylated phenols and anilines. Since then TMSCF3 has been widely used as a nucleophilic trifluoromethylating agent. Potassium (trifluoromethyl)trimethoxyborate for this purpose has been synthesised from B(OMe)3, CF3SiMe3 and KF. Aryl functionalization by C-H activation has also been reported.

Preparation The reagent is prepared from trimethylsilyl chloride and bromotrifluoromethane in the presence of a phosphorus(III) reagent that serves as a halogen acceptor.

Mechanism of action In the presence of a metal salt (M+ X−), the reagent reacts with aldehydes and ketones to give a trimethylsilyl ether, the net product of insertion of the carbonyl into the Si-CF3 bond. Hydrolysis gives trifluoromethyl methanols. The reagent also converts esters to trifluoromethyl ketones. A typical initiator is a soluble fluoride-containing species such as tetrabutylammonium fluoride; however, simple alkoxides such as KOtBu are also effective. The mechanism begins by generation of Si(CH3)3X and a highly reactive [CF3]− (trifluoromethide) intermediate. The [CF3]− attacks the carbonyl to generate an alkoxide anion. The alkoxide is silylated by the reagent to give the overall addition product, plus [CF3]−, thus propagating an anionic chain reaction. The reagent competes with the carbonyl for the reactive intermediate, rapidly sequestering [CF3]− in a reversibly-generated -ate complex [(CF3)2Si(CH3)3]−. This -ate complex is unable to react directly with the carbonyl, resulting in powerful inhibition of the chain reaction by the reagent. This inhibitory process is common to all anion-initiated reactions of the reagent, with the identity of the counter-cation (M+) playing a major role in controlling the overall rate.

Applications One of the known uses of TMSCF3 is in the synthesis of Alpelisib.

References

Illustrations

Worked examples

Example 1 — a first encounter with Trifluoromethyltrimethylsilane

Start with the simplest possible case. Write down what Trifluoromethyltrimethylsilane 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 Trifluoromethyltrimethylsilane 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 Trifluoromethyltrimethylsilane 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 Trifluoromethyltrimethylsilane

In research: Trifluoromethyltrimethylsilane 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 Trifluoromethyltrimethylsilane 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: Trifluoromethyltrimethylsilane is common in secondary-school and first-year university syllabi. It links to neighbouring topics Carbosilanes, Reagents for organic chemistry, Trifluoromethyl compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Trifluoromethyltrimethylsilane 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.

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How to study Trifluoromethyltrimethylsilane in 20 minutes

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

Frequently asked questions

What is Trifluoromethyltrimethylsilane in simple terms?

Trifluoromethyltrimethylsilane (known as Ruppert-Prakash reagent, TMSCF3) is an organosilicon compound with the formula CF3Si(CH3)3. It is a colorless liquid.

Why does Trifluoromethyltrimethylsilane 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 Trifluoromethyltrimethylsilane?

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 Trifluoromethyltrimethylsilane.