chemistry

LR132

LR132 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 LR132 rather than just read about it. In short: LR132 or (+)-3,4-dichloro-N-[(1R,2S)-2-(1-pyrrolidinyl)cyclohexyl]benzeneethanamine is a selective sigma receptor antagonist, with a reported binding affinity of Ki = 2 ± 0.1 nM for the sigma-1 receptor and more than 350 times selectivity over the sigma-2 receptor. Consistent with other reported sigma receptor antagonists, pretreating Swiss Webster mice with LR132 significantly decreases the convulsivity and lethali…

Key takeaways

LR132 belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect LR132 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of LR132 from memory before moving on to harder problems.

Reference excerpt

LR132 or (+)-3,4-dichloro-N-[(1R,2S)-2-(1-pyrrolidinyl)cyclohexyl]benzeneethanamine is a selective sigma receptor antagonist, with a reported binding affinity of Ki = 2 ± 0.1 nM for the sigma-1 receptor and more than 350 times selectivity over the sigma-2 receptor. Consistent with other reported sigma receptor antagonists, pretreating Swiss Webster mice with LR132 significantly decreases the convulsivity and lethality of cocaine.

Illustrations

Worked examples

Example 1 — a first encounter with LR132

Start with the simplest possible case. Write down what LR132 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 LR132 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 LR132 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 LR132

In research: LR132 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 LR132 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: LR132 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cyclohexanes, Dichlorophenyl compounds, Phenethylamines, so understanding it makes those chapters shorter.
In everyday life: Look for LR132 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 LR132 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what LR132 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 LR132 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is LR132 in simple terms?

Why does LR132 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 LR132?

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 LR132.