chemistry

Laballenic acid

Laballenic 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 Laballenic acid rather than just read about it. In short: Laballenic acid is a linear fatty acid composed of 18 carbon atoms, with two consecutive double bonds (allene) in position 5=6=7. It has the structural formula CH3(CH2)10−CH=C=CH−(CH2)3COOH.

Key takeaways

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

Reference excerpt

Laballenic acid is a linear fatty acid composed of 18 carbon atoms, with two consecutive double bonds (allene) in position 5=6=7. It has the structural formula CH3(CH2)10−CH=C=CH−(CH2)3COOH. The acid is one of the rare allenic fatty acids found in nature.

Discovery The acid was initially isolated in 1964 from the seed oil of Leonotis nepetifolia, a plant of the family Lamiaceae by M.O. Bagby, C.R. Smith Jr., and I.A. Wolff, and identified by the same authors a year later. Laballenic acid has also been found in Phlomoides tuberosa.

Synthesis Several methods of synthesis have been published. An efficient and enantioselective synthesis dates back to the year 2022. A further enantioselective synthesis is based on copper(II) bromide catalysis and the use of diphenylprolinol as a chiral auxiliary. It has also been reported that lamenallenic acid is probably biosynthesized from laballenic acid.

Physical properties Laballenic acid has axial chirality and is therefore optically active. The absolute configuration of laballenic acid was determined by stereoselective synthesis. There exist two configurations: the (R)-form and the (S)-form of laballenic acid. The naturally occurring acid has the R-configuration: it is an isomer of linoleic acid related with the similar phlomic acid.

Use Plant derivatives with high content of allenic fatty acids have shown cytotoxic, anti-inflammatory, and antiviral activity.

References

Illustrations

Worked examples

Example 1 — a first encounter with Laballenic acid

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

In research: Laballenic 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 Laballenic 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: Laballenic acid is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alkenoic acids, Cumulated dienes, Fatty acids, so understanding it makes those chapters shorter.
In everyday life: Look for Laballenic 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 Laballenic acid in 20 minutes

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

Frequently asked questions

What is Laballenic acid in simple terms?

Laballenic acid is a linear fatty acid composed of 18 carbon atoms, with two consecutive double bonds (allene) in position 5=6=7. It has the structural formula CH3(CH2)10−CH=C=CH−(CH2)3COOH.

Why does Laballenic 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 Laballenic 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 Laballenic acid.