science

Shibasaki catalyst

Shibasaki catalyst is a science 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 Shibasaki catalyst rather than just read about it. In short: Shibasaki catalysts constitute a class of hetero-bimetallic complexes with the general formula [Ln(binol)3(M)3] (M = alkali metal, Ln = lanthanide). They are named after Masakatsu Shibasaki, whose group first developed them, and are used as asymmetric catalysts.

Key takeaways

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

Reference excerpt

Shibasaki catalysts constitute a class of hetero-bimetallic complexes with the general formula [Ln(binol)3(M)3] (M = alkali metal, Ln = lanthanide). They are named after Masakatsu Shibasaki, whose group first developed them, and are used as asymmetric catalysts.

Development The Shibasaki group produced the first chiral lanthanide-binaphtholate complex in 1992, which was used to catalyse nitroaldol reactions. The complex was not characterised but was the first to perform the reaction enantioselectively. This success led to further research which resulted in the development of heterometallic complexes with the formula [Ln(binol)3(M)3], the structure of which was elucidated by X-ray crystallography.

Scope Shibasaki catalysts are effective for a wide range of enantioselective reactions including nitroaldol, Michael, Diels-Alder and hydrophosphonylation reactions. Their effectiveness arises in part from their ability to act as both a Brønsted base by virtue of the metal alkoxide and a Lewis acid via the lanthanide ion. Enantioselectivity has been found to be sensitive to both Ln and M; with the nitroaldol reaction being most effective when Ln = Eu and M = Li whereas the Michael reaction requires Ln = La and M = Na. It was observed that alterations of Ln and M caused predictable changes in the bite angle of the binaphthol backbone.

References

Illustrations

Worked examples

Example 1 — a first encounter with Shibasaki catalyst

Start with the simplest possible case. Write down what Shibasaki catalyst claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Shibasaki catalyst 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 Shibasaki catalyst 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 Shibasaki catalyst

In research: Shibasaki catalyst appears in science 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 Shibasaki catalyst 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: Shibasaki catalyst is common in secondary-school and first-year university syllabi. It links to neighbouring topics Catalysts, so understanding it makes those chapters shorter.
In everyday life: Look for Shibasaki catalyst 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 “Shibasaki catalyst” →

Affiliate

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

How to study Shibasaki catalyst in 20 minutes

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

Frequently asked questions

What is Shibasaki catalyst in simple terms?

Why does Shibasaki catalyst matter?

Because it connects several science 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 Shibasaki catalyst?

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 Shibasaki catalyst.