chemistry

Triisopropylamine

Triisopropylamine 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 Triisopropylamine rather than just read about it. In short: Triisopropylamine is an organic chemical compound consisting of three isopropyl groups bound to a central nitrogen atom. As a hindered tertiary amine, it can be used as a non-nucleophilic base and as a stabilizer for polymers; however, its applications are limited by its relatively high cost and difficult synthesis.

Key takeaways

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

Reference excerpt

Triisopropylamine is an organic chemical compound consisting of three isopropyl groups bound to a central nitrogen atom. As a hindered tertiary amine, it can be used as a non-nucleophilic base and as a stabilizer for polymers; however, its applications are limited by its relatively high cost and difficult synthesis.

Structure In the early 1990s, theoretical studies and electron diffraction analysis of the 3D structure of the molecule, in the gas phase or in non-polar solvents, indicated that the bonds between the nitrogen atom and the three carbon atoms were nearly coplanar in the ground state, instead of forming a trigonal pyramid as in simpler amines. The average C-N-C angle was claimed to be 119.2°, much closer to the 120° of the flat configuration than to the 111.8° of trimethylamine. This peculiarity was attributed to steric hindrance by the bulky isopropyl radicals. However, in 1998 X-ray diffraction analysis of the crystallized solid showed that the C3N core is actually pyramidal, with the N atom lying approximately 0.28 Å off the carbons' plane (whereas in trimethylamine the distance is about 0.45 Å). However the researchers could not rule out the crystal field effect as the cause of the asymmetry. The C-C-C planes of the isopropyl groups are slightly tilted (about 5°) relative to the threefold symmetry axis of the C3N core.

Even more hindered amines Triisopropylamine is notable as being among the most sterically hindered amines currently known. To date, di(tert-alkyl)(sec-alkyl)amines like di-tert-butyl(isopropyl)amine (tBu2iPrN) and diadamantylcyclohexylamine (Ad2CyN) have been prepared in low yield, as have a handful of tri-tert-alkylamines in which two of the tert-alkyl groups are tied together in a five-membered ring. As a result of the extreme steric crowding, these tertiary amines were found to be unusually susceptible to β-elimination to give an alkene and a secondary amine, even at temperatures close to room temperature (as low as 40 °C). As a result of these and other synthetic difficulties, the authors of a 2018 study predict that the even more crowded tri-tert-butylamine (tBu3N, unknown as of 2023) will likely remain a longstanding unsolved synthetic challenge, even though ab initio calculations indicate that it would be of reasonable stability if it could be prepared. Calculations indicate that tri-tert-butylamine should be planar at nitrogen. Though arguably a more hindered molecule, the structurally analogous tri-tert-alkyl carbinol 2,2,4,4-tetramethyl-3-t-butyl-pentane-3-ol (tri-tert-butylcarbinol, tBu3COH), has been known for decades (prepared by Bartlett and coworkers in 1945).

Preparation Steric effects make triisopropylamine difficult to synthesise and unlike less hindered tertiary amines (such as triethylamine) it cannot be produced by the alkylation of ammonia with alcohol; attempts to do so stall at diisopropylamine. It can be prepared from diisopropylamine on the laboratory scale:

Illustrations

Worked examples

Example 1 — a first encounter with Triisopropylamine

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

In research: Triisopropylamine 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 Triisopropylamine 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: Triisopropylamine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Diisopropylamino compounds, Non-nucleophilic bases, Tertiary amines, so understanding it makes those chapters shorter.
In everyday life: Look for Triisopropylamine 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 Triisopropylamine in 20 minutes

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

Frequently asked questions

What is Triisopropylamine in simple terms?

Why does Triisopropylamine 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 Triisopropylamine?

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 Triisopropylamine.