chemistry

Otera's catalyst

Otera's catalyst 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 Otera's catalyst rather than just read about it. In short: Otera's catalyst, named after Japanese chemist Junzo Otera, is an organostannane compound which has been used as a transesterification catalyst. This isothioscyanate compound is a member of a family of organostannanes reported by Wada and coworkers, and elaborated upon by Otera and coworkers.

Key takeaways

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

Reference excerpt

Otera's catalyst, named after Japanese chemist Junzo Otera, is an organostannane compound which has been used as a transesterification catalyst. This isothioscyanate compound is a member of a family of organostannanes reported by Wada and coworkers, and elaborated upon by Otera and coworkers.

Preparation This class of compounds may be prepared generally by the reaction of an organotin halide and oxide:

2 R2SnO + 2 R2SnX2 → (XR2SnOSnR2X)2 In particular, the thiocyanate compound was prepared by the reaction of dibutyltin oxide with dibutyltin diisothiocyanate. Otherwise, this compound is not commercially available.

Applications This thiocyanate compound can be used as a transesterification catalyst. Although it is not well known, it has been used in a number of total syntheses. In this application, the reaction occurs via the displacement of the bridging isothiocyanate ligands with the incoming alcohol to form an alcohol-bridged active catalyst. Tin acts as the Lewis acid, and gives the transesterified product. The reaction must be performed in nonpolar solvents in order to colocate the acid and alcohol at the catalytic center.

References

Illustrations

Worked examples

Example 1 — a first encounter with Otera's catalyst

Start with the simplest possible case. Write down what Otera's catalyst 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 Otera's 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 Otera's 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 Otera's catalyst

In research: Otera's catalyst 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 Otera's 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: Otera's catalyst is common in secondary-school and first-year university syllabi. It links to neighbouring topics Catalysts, Four-membered rings, Heterocyclic compounds with 3 rings, so understanding it makes those chapters shorter.
In everyday life: Look for Otera's 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.

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How to study Otera's catalyst in 20 minutes

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

Frequently asked questions

What is Otera's catalyst in simple terms?

Why does Otera's catalyst 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 Otera's 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 Otera's catalyst.