chemistry

N-Oleoylsarcosine

N-Oleoylsarcosine 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 N-Oleoylsarcosine rather than just read about it. In short: N-Oleoylsarcosine (Sarkosyl O) is an amphiphilic oleic acid derivative having a sarcosine head group (N-methylglycine) which is used as a water-in-oil emulsifier and corrosion inhibitor. Production A standard method for the preparation of N-acylamino acids is the Schotten-Baumann reaction, in which oleoyl chloride (from oleic acid and, e.g. phosphorus trichloride) is added to an aqueous solution of N-methylglycine a…

Key takeaways

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

Reference excerpt

N-Oleoylsarcosine (Sarkosyl O) is an amphiphilic oleic acid derivative having a sarcosine head group (N-methylglycine) which is used as a water-in-oil emulsifier and corrosion inhibitor.

Production A standard method for the preparation of N-acylamino acids is the Schotten-Baumann reaction, in which oleoyl chloride (from oleic acid and, e.g. phosphorus trichloride) is added to an aqueous solution of N-methylglycine at pH 10 (kept constant by the addition of sodium hydroxide solution).

Fatty acid-free N-oleoylsarcosine is obtained as an oil. The method is not suitable for industrial surfactant synthesis because of the relatively expensive production of the carboxylic acid chlorides and the expensive disposal of the phosphonic acid obtained as a byproduct. N-Oleoylsarcosine can be obtained in the reaction of oleic acid, N-methylglycine and its sodium salt at 170 °C for 8 to 10 hours upon elimination of water. More gentle conditions (120 °C) and shorter reaction times (3.5 hours) can be used when methyl oleate is reacted with sodium N-methylglycinate upon the addition of equimolar amounts of sodium methoxide in methanol. After absorption in water, acidification with concentrated sulfuric acid and extraction with butanone, N-Oleoylsarcosine is obtained in 92.5% yield.

Properties N-Oleoylsarcosine is a clear, yellow to brown, viscous liquid, which is sparsely soluble in water and acts acidic. As long-chain N-acylamino acid, the surfactant is soluble in many organic solvents and in mineral oil. In the alkaline it dissolves well in water. Because of its carboxamide structure, Sarkosyl O is chemically stable even at high pH values and strongly foaming as an anionic surfactant. N-oleyl sarcosine is only slightly toxic and easily biodegradable.

Applications N-Oleoylsarcosine is a mild surfactant which irritates skin and eyes comparatively little and is therefore used in personal care products such as skin cleansing agents because of its antimicrobial and virucidal properties. The sarcosine head group of the long-chain amphiphilic N-acylamino acid is responsible for the formation of chelate-like structures in the adsorption on polar and charged surfaces, e.g. on metals.

The molecules form oriented monomolecular films that protect the metal surface from corrosive attack. N-Oleoylsarcosine possesses already at low concentrations very good rust protection properties (in particularly in combination with the imidazoline derivative 2-(2-heptadec-8-enyl-2-imidazolin-1-yl)ethanol which also acts emulsifying and anticorrosive), also against non-ferrous metals such as aluminum and copper. Therefore, N-oleoylsarcosine is added as a corrosion inhibitor and emulsifier to rust protection fluids and lubricating greases, fuels and lubricants and refrigerating lubricants such as drilling and cutting oils.

References

Illustrations

Worked examples

Example 1 — a first encounter with N-Oleoylsarcosine

Start with the simplest possible case. Write down what N-Oleoylsarcosine 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 N-Oleoylsarcosine 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 N-Oleoylsarcosine 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 N-Oleoylsarcosine

In research: N-Oleoylsarcosine 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 N-Oleoylsarcosine 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: N-Oleoylsarcosine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Corrosion prevention, Fatty acid amides, Surfactants, so understanding it makes those chapters shorter.
In everyday life: Look for N-Oleoylsarcosine 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 N-Oleoylsarcosine in 20 minutes

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

Frequently asked questions

What is N-Oleoylsarcosine in simple terms?

N-Oleoylsarcosine (Sarkosyl O) is an amphiphilic oleic acid derivative having a sarcosine head group (N-methylglycine) which is used as a water-in-oil emulsifier and corrosion inhibitor. Production A standard method for the preparation of N-acylamino acids is the Schotten-Baumann reaction, in which…

Why does N-Oleoylsarcosine 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 N-Oleoylsarcosine?

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 N-Oleoylsarcosine.