science

Triphenylchloroethylene

Triphenylchloroethylene 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 Triphenylchloroethylene rather than just read about it. In short: Triphenylchloroethylene (TPCE; brand names Gynosone, Oestrogyl), or triphenylchlorethylene, also known as chlorotriphenylethylene or as phenylstilbene chloride, is a synthetic nonsteroidal estrogen of the triphenylethylene group that was marketed in the 1940s for the treatment of menopausal symptoms, vaginal atrophy, lactation suppression, and all other estrogen-indicated conditions. The estrogenic effects of triphe…

Key takeaways

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

Reference excerpt

Triphenylchloroethylene (TPCE; brand names Gynosone, Oestrogyl), or triphenylchlorethylene, also known as chlorotriphenylethylene or as phenylstilbene chloride, is a synthetic nonsteroidal estrogen of the triphenylethylene group that was marketed in the 1940s for the treatment of menopausal symptoms, vaginal atrophy, lactation suppression, and all other estrogen-indicated conditions. The estrogenic effects of triphenylethylene, the parent compound of triphenylchloroethylene, were discovered in 1937. Triphenylchloroethylene was first reported in 1938 and was found to have 20 to 100 times the estrogenic activity of the relatively weak triphenylethylene, a potentiation of effect that was afforded by its halogen substituent. The drug has a relatively long duration of action when administered via subcutaneous injection but a duration similar to that of diethylstilbestrol or estradiol benzoate when administered orally. Along with diethylstilbestrol and triphenylmethylethylene, triphenylchloroethylene was studied in 1944 by Sir Alexander Haddow for the treatment of breast cancer and was found to be significantly effective, and this is historically notable in that it was the first time that high-dose estrogens were found to be effective in the treatment of breast cancer.

SAR analogs Chlorotrianisene, or tri-p-anisylchloroethylene (TACE), is a potent marketed estrogen and a derivative of triphenylchloroethylene in which each of the three phenyl rings has been substituted with a 4-methoxy group. Estrobin, or DBE, is a related, never-marketed estrogen in which there is a bromine in place of the chlorine and two of the three phenyl rings have ethoxy groups. Broparestrol, or BDPE is a marketed selective estrogen receptor modulator (SERM) that has a bromine in place of the chlorine of triphenylchloroethylene and a 4-ethyl group on one of the phenyl rings. The SERM clomifene is also a derivative of triphenylchloroethylene.

Synthesis The chemical synthesis has been described. The Grignard reaction of benzylmagnesium bromide on benzophenone (or the action of phenylmagnesium bromide on desoxybenzoin or ethyl phenylacetate or chloroacetyl chloride etc.) give a carbinol which is dehydrated to the stilbene (i.e. triphenylethylene). Halogenation with chlorine in e.g. CCl4 solvent (c.f. TACE) then yields the product.

See also Triphenylbromoethylene Triphenyliodoethylene Although the vinylic halogens has already been considered, it was discovered that Triphenylacrylonitrile [6304-33-2] also potently modulates the estrogen receptor.

References

Illustrations

Worked examples

Example 1 — a first encounter with Triphenylchloroethylene

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

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

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

Frequently asked questions

What is Triphenylchloroethylene in simple terms?

Why does Triphenylchloroethylene 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 Triphenylchloroethylene?

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 Triphenylchloroethylene.