chemistry

Picolinic acid

Picolinic 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 Picolinic acid rather than just read about it. In short: Picolinic acid is an organic compound with the formula NC5H4CO2H. It is a derivative of pyridine with a carboxylic acid (COOH) substituent at the 2-position.

Key takeaways

Picolinic 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 Picolinic acid to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Picolinic acid from memory before moving on to harder problems.

Reference excerpt

Picolinic acid is an organic compound with the formula NC5H4CO2H. It is a derivative of pyridine with a carboxylic acid (COOH) substituent at the 2-position. It is an isomer of nicotinic acid and isonicotinic acid, which have the carboxyl side chain at the 3- and 4-positions, respectively. It is a white solid although impure samples can appear tan. The compound is soluble in water.

Production On a commercial scale, picolinic acid is produced by ammoxidation of 2-picoline 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 picoline with nitric acid.

In the laboratory, picolinic acid is formed from 2-methylpyridine by oxidation with potassium permanganate (KMnO4).

Reactions

Hydrogenation of picolinic acid gives piperidine-2-carboxylic acid, a precursor to the drug Mepivacaine. Picolinic acid is a bidentate chelating agent of elements such as chromium, zinc, manganese, copper, iron, and molybdenum in the human body. It is a substrate in the Mitsunobu reaction. In the Hammick reaction, picolinic acid reacts with ketones to give pyridine-2-carbonols:

NC5H4CO2H + R2C=O → NC5H4CR2(OH) + CO2

Biosynthesis Picolinic acid is a catabolite of the amino acid tryptophan through the kynurenine pathway. The immediate precursor is 2-amino-3-carboxymuconic semialdehyde, which can spontaneously cyclise to quinolinic acid. However, the enzyme aminocarboxymuconate-semialdehyde decarboxylase removes one of its carboxylic acid groups and initially produces 2-aminomuconic semialdehyde.

This intermdiate is chemically unstable and ring-closes to picolinic acid, with loss of water.

The function of picolinic acid is unclear, but it has been implicated in a variety of neuroprotective, immunological, and anti-proliferative effects. In addition, it is suggested to assist in the absorption of zinc(II) ions and other divalent or trivalent ions through the small intestine.

Picolinates Salts of picolinic acid (picolinates) include:

Chromium(III) picolinate Zinc picolinate

Illustrations

Worked examples

Example 1 — a first encounter with Picolinic acid

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

In research: Picolinic 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 Picolinic 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: Picolinic acid is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2-Pyridyl compounds, Aromatic acids, Chelating agents, so understanding it makes those chapters shorter.
In everyday life: Look for Picolinic 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 Picolinic acid in 20 minutes

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

Frequently asked questions

What is Picolinic acid in simple terms?

Picolinic acid is an organic compound with the formula NC5H4CO2H. It is a derivative of pyridine with a carboxylic acid (COOH) substituent at the 2-position.

Why does Picolinic 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 Picolinic 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 Picolinic acid.