chemistry

Tert-Butyldiphenylsilyl

Tert-Butyldiphenylsilyl 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 Tert-Butyldiphenylsilyl rather than just read about it. In short: tert-Butyldiphenylsilyl, also known as TBDPS, is a protecting group for alcohols. Its formula is C16H19Si-.

Key takeaways

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

Reference excerpt

tert-Butyldiphenylsilyl, also known as TBDPS, is a protecting group for alcohols. Its formula is C16H19Si-.

Development The tert-butyldiphenylsilyl group was first suggested as a protecting group by Hanessian and Lavallée in 1975. It was designed to supersede the use of Corey's tert-butyldimethylsilyl as a protecting group for alcohols:

In addition to retaining all the known features that are associated with silyl ethers, such as their ease and selectivity of formation, their adaptability to various analytical techniques, and their compatibility with a variety of conditions or synthetic transformations in organic chemistry, the [TBDPS] group offers some unique and novel features that constitute a significant improvement over the existing related groups, and warrants their communication at this time. The novel features that they highlight are the increased resistance to acidic hydrolysis and increased selectivity towards protection of primary hydroxyl groups. The group is unaffected by treatment with 80% acetic acid, which catalyses the deprotection of O-tetrapyranyl, O-trityl and O-tert-butyldimethylsilyl ethers. It is also unaffected by 50% trifluoroacetic acid (TFA), and survives the harsh acidic conditions used to install and remove isopropylidene or benzylidene acetals.

Applications in chemical synthesis The TBDPS group is prized for its increased stability towards acidic conditions and nucleophilic species over the other silyl ether protecting groups. This can be thought of as arising from the extra steric bulk of the groups surrounding the silicon atom. The protecting group is easily introduced by using the latent nucleophilicity of the hydroxyl group and an electrophilic source of TBDPS. This might involve using the triflate or the less reactive chloride of TBDPS along with a mild base such as 2,6-lutidine or pyridine and potentially a catalyst such as DMAP or imidazole. The ease of installation of the protecting group follows the order: 1o > 2o > 3o, allowing the least hindered hydroxyl group to be protected in the presence of more hindered hydroxyls.

Protection of equatorial hydroxyl groups can be achieved over axial hydroxyl groups by the use of a cationic silyl species generated by tert-butyldiphenylsilyl chloride and a halogen abstractor, silver nitrate.

The increased stability towards acidic hydrolysis and nucleophilic species allows for the TBDPS groups in a substrate to be retained while other silyl ethers are removed. The TMS group may easily be removed in the presence of a TBDPS group by reaction with TsOH. The group is even more resistant to acid hydrolysis than the bulky TIPS. However, in the presence of a fluoride source such as TBAF or TAS-F, TIPS groups are more stable than TBDPS groups. The TBDPS group is of similar stability to the TBDMS group and is more stable in the presence of fluoride than all other simple alkyl silyl ethers. It is possible to remove the TBDPS group selectively, leaving a TBDMS group intact, using NaH in HMPA at 0 °C for five minutes.

Stability The TBDPS group is stable under a wide variety of conditions:

References

Illustrations

Worked examples

Example 1 — a first encounter with Tert-Butyldiphenylsilyl

Start with the simplest possible case. Write down what Tert-Butyldiphenylsilyl 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 Tert-Butyldiphenylsilyl 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 Tert-Butyldiphenylsilyl 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 Tert-Butyldiphenylsilyl

In research: Tert-Butyldiphenylsilyl 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 Tert-Butyldiphenylsilyl 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: Tert-Butyldiphenylsilyl is common in secondary-school and first-year university syllabi. It links to neighbouring topics Organosilicon compounds, Protecting groups, Tert-butyl compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Tert-Butyldiphenylsilyl 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 Tert-Butyldiphenylsilyl in 20 minutes

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

Frequently asked questions

What is Tert-Butyldiphenylsilyl in simple terms?

tert-Butyldiphenylsilyl, also known as TBDPS, is a protecting group for alcohols. Its formula is C16H19Si-.

Why does Tert-Butyldiphenylsilyl 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 Tert-Butyldiphenylsilyl?

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 Tert-Butyldiphenylsilyl.