chemistry

Lithium diphenylphosphide

Lithium diphenylphosphide 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 Lithium diphenylphosphide rather than just read about it. In short: Lithium diphenylphosphide contains lithium and the organophosphorus anion with the formula (C6H5)2PLi. It is a red, air-sensitive solid that is used in the preparation of diphenylphosphino compounds.

Key takeaways

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

Reference excerpt

Lithium diphenylphosphide contains lithium and the organophosphorus anion with the formula (C6H5)2PLi. It is a red, air-sensitive solid that is used in the preparation of diphenylphosphino compounds.

Synthesis and reactions The lithium, sodium, and potassium salts are prepared by reduction of chlorodiphenylphosphine, triphenylphosphine, or tetraphenyldiphosphine with alkali metals (M):

(C6H5)2PCl + 2 M → (C6H5)2PM + MCl (C6H5)3P + 2 M → (C6H5)2PM + MC6H5 (C6H5)4P2 + 2 M → 2 (C6H5)2PM They can also be obtained by deprotonation of diphenylphosphine. With water, the salts convert to diphenylphosphine:

(C6H5)2PLi + H2O → (C6H5)2PH + LiOH With halocarbons, the salts react to give tertiary phosphines:

(C6H5)2PM + RX → (C6H5)2PR + MX When treated with metal halides, lithium diphenylphosphide gives transition metal phosphido complexes.

Structure and physical properties Although treated as salts, alkali diphenylphosphides are highly aggregated in solution. They adopt polymeric structures as solids.

As an ether complex, the lithium salt is dark red.

Related compounds Sodium diphenylphosphide (CAS RN 4376-01-6) Potassium diphenylphosphide (CAS RN 15475-27-1)

References

Illustrations

Worked examples

Example 1 — a first encounter with Lithium diphenylphosphide

Start with the simplest possible case. Write down what Lithium diphenylphosphide 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 Lithium diphenylphosphide 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 Lithium diphenylphosphide 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 Lithium diphenylphosphide

In research: Lithium diphenylphosphide 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 Lithium diphenylphosphide 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: Lithium diphenylphosphide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lithium salts, Organolithium compounds, Phenyl compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Lithium diphenylphosphide 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Lithium diphenylphosphide” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Lithium diphenylphosphide in 20 minutes

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

Frequently asked questions

What is Lithium diphenylphosphide in simple terms?

Lithium diphenylphosphide contains lithium and the organophosphorus anion with the formula (C6H5)2PLi. It is a red, air-sensitive solid that is used in the preparation of diphenylphosphino compounds.

Why does Lithium diphenylphosphide 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 Lithium diphenylphosphide?

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 Lithium diphenylphosphide.