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Isonicotinic acid

Isonicotinic acid 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 Isonicotinic acid rather than just read about it. In short: Isonicotinic acid or pyridine-4-carboxylic acid is an organic compound with the formula C5H4N(CO2H). It is a derivative of pyridine with a carboxylic acid substituent at the 4-position.

Isonicotinic acid — main illustration
Isonicotinic acid — illustration

Key takeaways

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

Reference excerpt

Isonicotinic acid or pyridine-4-carboxylic acid is an organic compound with the formula C5H4N(CO2H). It is a derivative of pyridine with a carboxylic acid substituent at the 4-position. It is an isomer of picolinic acid and nicotinic acid, which have the carboxyl group at the 2- and 3-position respectively compared to the 4-position for isonicotinic acid.

Production On a commercial scale, isonicotinic acid, like other pyridine carboxylic acid is produced by ammoxidation of 4-picoline (4-methylpyridine) followed by hydrolysis of the resulting nitrile:

NC5H4CH3 + 1.5 O2 + NH3 → NC5H4C≡N + 3 H2O NC5H4C≡N + 2 H2O → NC5H4CO2H + NH3 It is also produced by oxidation of 4-picoline with nitric acid.

Derivatives Isonicotinic acids is a term loosely used for derivatives of isonicotinic acid. Hydrazide derivatives include isoniazid, iproniazid, and nialamide. Amide and ester derivatives include ethionamide and dexamethasone isonicotinate. Its conjugate base forms coordination polymers and MOFs by binding metal ions through both the N and carboxylate.

See also Pyridinecarboxylic acids

References

External links Isonicotinic+Acids at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

Illustrations

Isonicotinic acid: Ball-and-stick model
Ball-and-stick model
Isonicotinic acid illustration

Worked examples

Example 1 — a first encounter with Isonicotinic acid

Start with the simplest possible case. Write down what Isonicotinic acid 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 Isonicotinic acid 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 Isonicotinic acid 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 Isonicotinic acid

In research
Isonicotinic acid 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 Isonicotinic acid 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
Isonicotinic acid is common in secondary-school and first-year university syllabi. It links to neighbouring topics 4-Pyridyl compounds, Aromatic acids, so understanding it makes those chapters shorter.
In everyday life
Look for Isonicotinic acid 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 Isonicotinic acid in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Isonicotinic acid means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Isonicotinic acid out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Isonicotinic acid in simple terms?

Isonicotinic acid or pyridine-4-carboxylic acid is an organic compound with the formula C5H4N(CO2H). It is a derivative of pyridine with a carboxylic acid substituent at the 4-position.

Why does Isonicotinic acid 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 Isonicotinic acid?

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 Isonicotinic acid.

Tags

  • 4-Pyridyl compounds
  • Aromatic acids

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