chemistry

RU-16117

RU-16117 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 RU-16117 rather than just read about it. In short: RU-16117 is an estrogen medication which was investigated for the potential treatment of symptoms of estrogen deficiency such as hot flashes and osteoporosis in women but was never marketed. It was developed for use by mouth.

Key takeaways

RU-16117 belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect RU-16117 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of RU-16117 from memory before moving on to harder problems.

Reference excerpt

RU-16117 is an estrogen medication which was investigated for the potential treatment of symptoms of estrogen deficiency such as hot flashes and osteoporosis in women but was never marketed. It was developed for use by mouth.

Pharmacology

Pharmacodynamics RU-16117 is an estrogen, or an agonist of the estrogen receptor (ER). In mouse uterine tissue, it shows about 5 to 13% of the affinity of estradiol for the ER and about 1% of the estrogenic activity of estradiol. Conversely, it shows no affinity for the androgen, progesterone, glucocorticoid, and mineralocorticoid receptors, nor any activities associated with interactions with these receptors. While the association rate of RU-16117 to the ER is the same as that of moxestrol, it dissociates from the ER extremely rapidly at rates of about three times faster than estradiol and about 20 times faster than moxestrol. This is similar to the case of estriol, which RU-16117 is described as sharing similarities with. RU-16117 is described as a weak or partial estrogen or a mixed estrogen/antiestrogen. It has been described as having highly active antiestrogenic activity with very weak uterotrophic activity. However, higher doses and/or prolonged administration of RU-16117 have been reported to induce equivalent estrogenic responses relative to estradiol and moxestrol.

Chemistry

RU-16117, also known as 11α-methoxy-17α-ethynylestradiol (11α-MeO-EE) or as 11α-methoxy-17α-ethynylestra-1,3,5(10)-triene-3,17β-diol, is a synthetic estrane steroid and a derivative of estradiol. It is specifically a derivative of ethinylestradiol (17α-ethynylestradiol) with a methoxy group at the C11α position. The compound is the C11α isomer or C11 epimer of moxestrol (11β-methoxy-17α-ethynylestradiol).

Synthesis

RU-16117 is derived from Δ9,11-dehydroestradiol (1). Its two hydroxy groups are first protected by the formation of benzyl ethers, giving (2) and the isolated double bond is hydrated by hydroboration, followed by oxidation with hydrogen peroxide in alkali to give (3). The newly-introduced alcohol is methylated with iodomethane to produce (4). After removal of the protecting groups by catalytic hydrogenation to form (5), the hydroxyl group in the five-membered ring is oxidized to a ketone with chromium trioxide and the product, (6), is reacted with potassium acetylide to introduce the acetylide group of the drug.

References

Illustrations

Worked examples

Example 1 — a first encounter with RU-16117

Start with the simplest possible case. Write down what RU-16117 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 RU-16117 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 RU-16117 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 RU-16117

In research: RU-16117 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 RU-16117 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: RU-16117 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Abandoned drugs, Antiestrogens, Estranes, so understanding it makes those chapters shorter.
In everyday life: Look for RU-16117 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 RU-16117 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what RU-16117 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 RU-16117 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is RU-16117 in simple terms?

Why does RU-16117 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 RU-16117?

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 RU-16117.