chemistry

Organonickel(IV) complex

Organonickel(IV) complex 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 Organonickel(IV) complex rather than just read about it. In short: Organonickel(IV) complex are organonickel compounds that feature nickel in the +4 oxidation state. These high-valent nickel compounds are intermediates or models thereof for various catalytic reactions.

Key takeaways

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

Reference excerpt

Organonickel(IV) complex are organonickel compounds that feature nickel in the +4 oxidation state. These high-valent nickel compounds are intermediates or models thereof for various catalytic reactions.

Representative preparation Ni(IV) complexes are typically supported by highly basic and chelating ligands. They are often produced by oxidation of related Ni(II) and Ni(III) complexes using both conventional and exotic oxidants, such as ferrocenium and S-(trifluoromethyl)dibenzothiophenium triflate (Umemoto reagent). For example, one of the first isolated NiIV complexes that was used in a cross coupling transformation was reported by Linden and Dimitrov in 2003 and was prepared by simple air-induced oxidation of the following anionic NiII complex:

Reactivity and synthetic transformations

Carbon-heteroatom bond formation Studies reported by Sanford and Camasso in 2015 revealed the ability of a NiIV organometallic complex to deliver carbon(sp3)-oxygen, carbon(sp3)-nitrogen, and carbon(sp3)-sulfur bonds. The NiIV species was generated by oxidation of a nickel(II) trispyrazolylborate complex.

C-H activation In 2014, Chatani and coworkers proposed that a NiIV intermediate was formed during an aminoquinoline-directed aliphatic C-H activation process using diaryliodonium salts as an oxidant.

Trifluoromethylations NiIV can perform challenging trifluoromethylation reactions on (hetero)arenes. A representative method is shown below, reported by Nebra and coworkers in 2017. Here, a six-coordinate NiIV complex transfers a CF3 ligand to a functionalized arene.

A catalytic variant was reported by Sanford and coworkers in 2019. The mechanism for this transformation is shown in the following scheme. Here, the key NiIV intermediate undergoes a slow homolysis to produce a NiIII intermediate and a trifluoromethyl radical, which can promote propagation of the catalytic cycle.

References

Illustrations

Organonickel(IV) complex: AQ-directed C-H activation — AQ-directed C-H activation

Organonickel(IV) complex: Stoichiometric trifluromethylation by a Ni(IV) reagent. — Stoichiometric trifluromethylation by a Ni(IV) reagent.

Worked examples

Example 1 — a first encounter with Organonickel(IV) complex

Start with the simplest possible case. Write down what Organonickel(IV) complex 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 Organonickel(IV) complex 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 Organonickel(IV) complex 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 Organonickel(IV) complex

In research: Organonickel(IV) complex 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 Organonickel(IV) complex 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: Organonickel(IV) complex is common in secondary-school and first-year university syllabi. It links to neighbouring topics Nickel compounds, Organometallic compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Organonickel(IV) complex 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 Organonickel(IV) complex in 20 minutes

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

Frequently asked questions

What is Organonickel(IV) complex in simple terms?

Why does Organonickel(IV) complex 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 Organonickel(IV) complex?

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 Organonickel(IV) complex.