chemistry

Lamenallenic acid

Lamenallenic 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 Lamenallenic acid rather than just read about it. In short: Lamenallenic acid is a linear octadecatrienic fatty acid with the structural formula CH3CH=CH(CH2)8CH=C=CH(CH2)3COOH. The delta notation is 18:3-delta-5,6allene,16t.

Key takeaways

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

Reference excerpt

Lamenallenic acid is a linear octadecatrienic fatty acid with the structural formula CH3CH=CH(CH2)8CH=C=CH(CH2)3COOH. The delta notation is 18:3-delta-5,6allene,16t. This is one of the rare allenic fatty acids found in nature, probably biosynthesized from laballenic acid.

Physical properties Some authors have attributed the cis-configuration to the double bond in the position 16=17. The allene group is responsible for the marked optical activity of the acid. Lamenallenic acid is levorotatory with (R)-configuration.

Discovery The acid was initially isolated in 1967 by Mikolajczak, Rogers, Smith, and Wolff in the seed oil of Lamium purpureum (10-16%), a plant of the Lamiaceae family. The compound is also found in the seed oil of other Lamiaceae: Lamium maculatum (~8%), Lamium album (~5%), Lamium amplexicaule (~5%).

Synthesis The acid can be obtained by a highly enantioselective synthesis, utilizing the recently developed EATA (enantioselective allenylation of terminal alkynes) reaction and aerobic oxidation reaction.

References

Illustrations

Worked examples

Example 1 — a first encounter with Lamenallenic acid

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

In research: Lamenallenic 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 Lamenallenic 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: Lamenallenic 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 Lamenallenic 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 Lamenallenic acid in 20 minutes

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

Frequently asked questions

What is Lamenallenic acid in simple terms?

Lamenallenic acid is a linear octadecatrienic fatty acid with the structural formula CH3CH=CH(CH2)8CH=C=CH(CH2)3COOH. The delta notation is 18:3-delta-5,6allene,16t.

Why does Lamenallenic 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 Lamenallenic 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 Lamenallenic acid.