astronomy

Oyo Mitsunobu

Oyo Mitsunobu is a astronomy 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 Oyo Mitsunobu rather than just read about it. In short: Ōyō Mitsunobu (光延旺洋, Mitsunobu Ōyō; 1934–2003) was a Japanese chemist specializing in organic synthesis. In 1967, he introduced the Mitsunobu reaction, which is named after him.

Key takeaways

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

Reference excerpt

Ōyō Mitsunobu (光延旺洋, Mitsunobu Ōyō; 1934–2003) was a Japanese chemist specializing in organic synthesis. In 1967, he introduced the Mitsunobu reaction, which is named after him. His father was Tōyō Mitsunobu, an admiral (posthumously) of the Japanese navy. Mitsunobu earned his bachelor's degree at Gakushuin University in Tokyo and subsequently studied at the Tokyo Institute of Technology starting in 1959, where he obtained his doctorate in 1966 under the supervision of Teruaki Mukaiyama. From 1986-2002 he was a Professor in the Faculty of Science and Engineering, Aoyama Gakuin University. His work focused on the chemistry of nucleosides and nucleotides, as well as stereoselective reactions. He is best known for the Mitsunobu reaction which involves the substitution of (primary or secondary) alcohols with nucleophiles (the original reaction was an esterification) and has found widespread application, particularly in the synthesis of natural products and in biochemistry. It proceeds under relatively mild conditions and is stereospecific. It is an oxidation-reduction condensation reaction in which triphenylphosphine is oxidized and diethyl azodicarboxylate (DEAD) is reduced to its corresponding hydrazine derivative (reagents serving a similar function to triphenylphosphine and DEAD in the original version of the reaction are known as Mitsunobu reagents). Mitsunobu introduced the reaction in 1967 and developed several variants shortly thereafter. Between 1996 and 2008, 1,615 papers with "Mitsunobu reaction" in the title were published according to SciFinder, including 186 patents. In 1984 he received the Synthetic Organic Chemistry Award, Japan. The text of the award states that it is for the "Discovery and development of stereospecific reactions through activation of alcoholic hydroxyl groups".

References

Worked examples

Example 1 — a first encounter with Oyo Mitsunobu

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

In research: Oyo Mitsunobu appears in astronomy 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 Oyo Mitsunobu 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: Oyo Mitsunobu is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1934 births, 2003 deaths, Academic staff of Aoyama Gakuin University, so understanding it makes those chapters shorter.
In everyday life: Look for Oyo Mitsunobu 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 Oyo Mitsunobu in 20 minutes

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

Frequently asked questions

What is Oyo Mitsunobu in simple terms?

Ōyō Mitsunobu (光延旺洋, Mitsunobu Ōyō; 1934–2003) was a Japanese chemist specializing in organic synthesis. In 1967, he introduced the Mitsunobu reaction, which is named after him.

Why does Oyo Mitsunobu matter?

Because it connects several astronomy 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 Oyo Mitsunobu?

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 Oyo Mitsunobu.