chemistry

Triethylenetetramine

Triethylenetetramine 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 Triethylenetetramine rather than just read about it. In short: Triethylenetetramine (TETA and trien), also known as trientine (INN) when used medically, is an organic compound with the formula [CH2NHCH2CH2NH2]2. The pure free base is a colorless oily liquid, but, like many amines, older samples assume a yellowish color due to impurities resulting from air oxidation.

Key takeaways

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

Reference excerpt

Triethylenetetramine (TETA and trien), also known as trientine (INN) when used medically, is an organic compound with the formula [CH2NHCH2CH2NH2]2. The pure free base is a colorless oily liquid, but, like many amines, older samples assume a yellowish color due to impurities resulting from air oxidation. It is soluble in polar solvents. The branched isomer tris(2-aminoethyl)amine and piperazine derivatives may also be present in commercial samples of TETA. The hydrochloride salts are used medically as a treatment for copper toxicity.

Uses

Epoxy uses The reactivity and uses of TETA are similar to those for the related polyamines ethylenediamine and diethylenetriamine. It is primarily used as a crosslinker ("hardener") in epoxy curing. TETA, like other aliphatic amines, react quicker and at lower temperatures than aromatic amines due to less negative steric effects since the linear nature of the molecule provides it the ability to rotate and twist.

Medical uses

The hydrochloride salt of TETA, referred to as trientine hydrochloride, is a chelating agent that is used to bind and remove copper in the body to treat Wilson's disease, particularly in those who are intolerant to penicillamine. Some recommend trientine as first-line treatment, but experience with penicillamine is more extensive. Trientine hydrochloride (brand name Syprine) was approved for medical use in the United States in November 1985. Trientine tetrahydrochloride (brand name Cuprior) was approved for medical use in the European Union in September 2017. It is indicated for the treatment of Wilson's disease in adults, adolescents and children five years of age or older who are intolerant to D-penicillamine therapy. Trientine dihydrochloride (brand name Cufence) was approved for medical use in the European Union in July 2019. It is indicated for the treatment of Wilson's disease in adults, adolescents and children five years of age or older who are intolerant to D-penicillamine therapy. The most common side effects include nausea, especially when starting treatment, skin rash, duodenitis (inflammation of the duodenum, the part of the gut leading out of the stomach), and severe colitis (inflammation in the large bowel causing pain and diarrhea).

Society and culture

Controversies In the United States, Valeant Pharmaceuticals International raised the price of its Syprine brand of TETA from $625 to $21,267 for 100 pills over five years. The New York Times said that this "egregious" price increase caused public outrage. Teva Pharmaceuticals developed a generic, which patients and doctors expected to be cheaper, but when it was introduced in February 2018, Teva's price was $18,375 for 100 pills. Aaron Kesselheim, who studies drug pricing at Harvard Medical School, said that drug companies price the product at what they think the market will bear.

Production TETA is prepared by heating ethylenediamine or ethanolamine/ammonia mixtures over an oxide catalyst. This process gives a variety of amines, especially ethylene amines which are separated by distillation and sublimation. An idealized equation follows:

3 H2NCH2CH2NH2 → H2NCH2CH2NHCH2CH2NHCH2CH2NH2 + 2 NH3

Coordination chemistry TETA is a tetradentate ligand in coordination chemistry, where it is referred to as trien. Octahedral complexes of the type M(trien)L2 can adopt several diastereomeric structures. 1,4,8,11-Tetraazaundecane is a closely related tetraamine ligand.

References

Illustrations

Worked examples

Example 1 — a first encounter with Triethylenetetramine

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

In research: Triethylenetetramine 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 Triethylenetetramine 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: Triethylenetetramine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aminoethyl compounds, Chelating agents, Orphan drugs, so understanding it makes those chapters shorter.
In everyday life: Look for Triethylenetetramine 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 Triethylenetetramine in 20 minutes

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

Frequently asked questions

What is Triethylenetetramine in simple terms?

Why does Triethylenetetramine 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 Triethylenetetramine?

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 Triethylenetetramine.