science

Triphenylbromoethylene

Triphenylbromoethylene is a science 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 Triphenylbromoethylene rather than just read about it. In short: Triphenylbromoethylene (TPBE; brand names Bromylene, Eitriphin, Oestronyl, Prostilban, Tribenorm), also known as bromotriphenylethylene or as phenylstilbene bromide, is a synthetic nonsteroidal estrogen of the triphenylethylene group that was marketed in the 1940s similarly to the closely related estrogen triphenylchloroethylene. SAR A diethoxylated derivative of triphenylbromoethylene, estrobin (DBE), is also an es…

Key takeaways

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

Reference excerpt

Triphenylbromoethylene (TPBE; brand names Bromylene, Eitriphin, Oestronyl, Prostilban, Tribenorm), also known as bromotriphenylethylene or as phenylstilbene bromide, is a synthetic nonsteroidal estrogen of the triphenylethylene group that was marketed in the 1940s similarly to the closely related estrogen triphenylchloroethylene.

SAR A diethoxylated derivative of triphenylbromoethylene, estrobin (DBE), is also an estrogen, but, in contrast, was never marketed. An ethylated derivative of triphenylbromoethylene, broparestrol (BDPE), is a selective estrogen receptor modulator (SERM) that has been marketed. Although the vinylic halogens has already been discussed, it was discovered that Triphenylacrylonitrile [6304-33-2] also potently modulates the estrogen receptor.

Synthesis and reactions The synthesis of triphenylbromoethylene has been discussed previously: Grignard reaction of Triphenylbromoethylene with carbon dioxide gives a compound that is called Triphenylacrylic acid [4452-05-5]. The acid can then undergo esterification with Diethylethanolamine [100-37-8] (via the acid chloride for example would work). This agent was claimed to have hormonal activity but was also stated to function as a coronary vasodilator. In terms of the SAR it is counselled to consider an agent that is called Cinnamaverine [1679-75-0]. Cinnamaverine has the same structure as the compound just described but differs in that it was made by the esterification of 2,3-diphenylacrylic acid [91-48-5]. By contrast though, Cinnamaverine was claimed to function as a Local anaesthetic, antispasmodic agent. It does need to be said though that saponification of Triphenylacrylonitrile [6304-33-2] would also yield the Triphenylacrylic acid. It is worth pointing out that this compound was made by a reaction that is called a Knoevenagel condensation. (The related Perkin reaction only works with benzaldehydes and not benzophenones.)

See also Chlorotrianisene M2613 Triphenyliodoethylene

References

Illustrations

Worked examples

Example 1 — a first encounter with Triphenylbromoethylene

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

In research: Triphenylbromoethylene appears in science 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 Triphenylbromoethylene 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: Triphenylbromoethylene is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genito-urinary system drug stubs, Organobromides, Synthetic estrogens, so understanding it makes those chapters shorter.
In everyday life: Look for Triphenylbromoethylene 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 Triphenylbromoethylene in 20 minutes

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

Frequently asked questions

What is Triphenylbromoethylene in simple terms?

Why does Triphenylbromoethylene matter?

Because it connects several science 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 Triphenylbromoethylene?

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 Triphenylbromoethylene.