chemistry

Methallenestril

Methallenestril 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 Methallenestril rather than just read about it. In short: Methallenestril (INNTooltip International Nonproprietary Name) (brand names Cur-men, Ercostrol, Geklimon, Novestrine, Vallestril), also known as methallenoestril (BANTooltip British Approved Name) and as methallenestrol, as well as Horeau's acid, is a synthetic nonsteroidal estrogen and a derivative of allenolic acid and allenestrol (specifically, a methyl ether of it) that was formerly used to treat menstrual issue…

Key takeaways

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

Reference excerpt

Methallenestril (INNTooltip International Nonproprietary Name) (brand names Cur-men, Ercostrol, Geklimon, Novestrine, Vallestril), also known as methallenoestril (BANTooltip British Approved Name) and as methallenestrol, as well as Horeau's acid, is a synthetic nonsteroidal estrogen and a derivative of allenolic acid and allenestrol (specifically, a methyl ether of it) that was formerly used to treat menstrual issues but is now no longer marketed. It is a seco-analogue of bisdehydrodoisynolic acid, and although methallenestril is potently estrogenic in rats, in humans it is only weakly so in comparison. Vallestril was a brand of methallenestril issued by G. D. Searle & Company in the 1950s. Methallenestril is taken by mouth. By the oral route, a dose of 25 mg methallenestril is approximately equivalent to 1 mg diethylstilbestrol, 4 mg dienestrol, 20 mg hexestrol, 25 mg estrone, 2.5 mg conjugated estrogens, and 0.05 mg ethinylestradiol.

Synthesis The chemical synthesis has been described. Unavailable methods:

The Grignard reaction between 2-propionyl-6-methoxynaphthalene (promen) [2700-47-2] (1) and Ethyl 2-bromoisobutyrate [600-00-0] (2) occurs to give ethyl beta-ethyl-beta-hydroxy-6-methoxy-alpha,alpha-dimethylnaphthalene-2-propionate [85536-81-8] (3). Dehydration of the carbinol in aqueous lye may be accompanied by saponification of the ester (although not in the patented version) to give [60533-05-3] (4). Re-esterification with diazomethane gave (5). Catalytic hydrogenation of the olefin led to PC608080 (6). Saponification of the ester completed the synthesis of Methallenestril (7). An alternative method is described in the patent that relies on 2-cyano-6-methoxynaphthalene (cyanonerolin) [67886-70-8]. The precursor to this is described in a Hoechst patent.

See also Carbestrol Fenestrel Doisynoestrol Doisynolic acid SC-4289 & allenestrol

References

Illustrations

Worked examples

Example 1 — a first encounter with Methallenestril

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

In research: Methallenestril 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 Methallenestril 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: Methallenestril is common in secondary-school and first-year university syllabi. It links to neighbouring topics Carboxylic acids, Naphthalenes, Synthetic estrogens, so understanding it makes those chapters shorter.
In everyday life: Look for Methallenestril 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 Methallenestril in 20 minutes

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

Frequently asked questions

What is Methallenestril in simple terms?

Why does Methallenestril 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 Methallenestril?

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 Methallenestril.