chemistry

Pentomone

Pentomone 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 Pentomone rather than just read about it. In short: Pentomone (INNTooltip International Nonproprietary Name, USANTooltip United States Adopted Name; development codes Lilly 113935 and LY-113935) is a nonsteroidal antiandrogen (NSAA) described as a "prostate growth inhibitor" which was never marketed. It was synthesized and assayed in 1978.

Key takeaways

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

Reference excerpt

Pentomone (INNTooltip International Nonproprietary Name, USANTooltip United States Adopted Name; development codes Lilly 113935 and LY-113935) is a nonsteroidal antiandrogen (NSAA) described as a "prostate growth inhibitor" which was never marketed. It was synthesized and assayed in 1978.

Synthesis

Condensation of two equivalents of o-vanillin with 4,4-dimethylcyclohexadienone (2) gives the five-ring ketone derivative (3). The reaction may be visualized as initial conjugate addition of phenoxide to the enone followed by interception of the resulting anion by the aldehyde carbonyl group. Catalytic hydrogenation then reduces both olefin pi-bonds as well as the ketone, to give (4). Re-oxidation of the alcohol thus formed with pyridinium chlorochromate affords pentomone.

References

Illustrations

Worked examples

Example 1 — a first encounter with Pentomone

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

In research: Pentomone 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 Pentomone 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: Pentomone is common in secondary-school and first-year university syllabi. It links to neighbouring topics Drugs not assigned an ATC code, Ethers, Heterocyclic compounds with 5 rings, so understanding it makes those chapters shorter.
In everyday life: Look for Pentomone 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 Pentomone in 20 minutes

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

Frequently asked questions

What is Pentomone in simple terms?

Why does Pentomone 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 Pentomone?

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 Pentomone.