chemistry

Trichloromethane sulfenyl chloride

Trichloromethane sulfenyl chloride 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 Trichloromethane sulfenyl chloride rather than just read about it. In short: Trichloromethane sulfenyl chloride or perchloromethyl mercaptan is the organosulfur compound with the formula Cl3C−S−Cl. It is mainly used as an intermediate for the synthesis of dyes and fungicides (captan, folpet).

Key takeaways

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

Reference excerpt

Trichloromethane sulfenyl chloride or perchloromethyl mercaptan is the organosulfur compound with the formula Cl3C−S−Cl. It is mainly used as an intermediate for the synthesis of dyes and fungicides (captan, folpet). It is a colorless oil, although commercial samples are yellowish. It is insoluble in water but soluble in organic solvents. It has a foul, acrid odor. Perchloromethyl mercaptan is a common name. The systematic name is trichloromethanesulfenyl chloride, because the compound is a sulfenyl chloride, not a mercaptan.

History It was used as a chemical warfare agent by the French in the 1915 battle of Champagne. Shortly thereafter, wartime use was abandoned due to the clear warning properties, the decomposition in the presence of iron and steel, and the easy removal of the vapor by charcoal.

Preparation The method to prepare perchloromethyl mercaptan was first described by Rathke in 1873 and is still used. Carbon disulfide is chlorinated using an iodine catalyst. The following equations operate most efficiently at temperatures below about 30 °C

CS2 + 3 Cl2 → CCl3SCl + SCl2 2 CS2 + 5 Cl2 → 2 CCl3SCl + S2Cl2 At higher temperatures, the chlorination gives carbon tetrachloride and additional sulfur chlorides. The formation of byproducts can be suppressed by performing the reaction in the presence of diketones. Another byproduct is thiophosgene. The more volatile byproducts such as carbon tetrachloride and sulfur dichloride can be removed by distillation. The separation of perchloromethyl mercaptan from S2Cl2 by distillation is challenging since their boiling points are very close. Another byproduct that forms is hexachloroethane. Innovations in the basic Rathke method have been reported.

Reactivity The compound slowly hydrolyzes:

8 Cl3C−S−Cl + 16 H2O → 8 CO2 + 32 HCl + S8 Controlled hydrolysis affords chlorocarbonylsulfenyl chloride:

Cl3C−S−Cl + H2O → Cl−S−C(=O)−Cl + 2 HCl Perchloromethyl mercaptan is corrosive to most metals. It reacts with iron, evolving carbon tetrachloride. Perchloromethyl mercaptan is oxidized by nitric acid to trichloromethanesulfonyl chloride (Cl3C−S(=O)2−Cl), a white solid.

Toxicity

When it is heated or in a fire, it will emit toxic and corrosive gases. It is also very toxic by inhalation or skin absorption. At least two mechanisms could account for the toxicity of perchloromethyl mercaptan, as hypothesized by Althoff (1973). The first mechanism is a reaction between perchloromethyl mercaptan and biological functional groups such as hydroxyl, sulfhydryl, amino and carboxyl groups. This results in an inactivation of key enzymes. A second general pathway reaction is the hydrolysis to give hydrochloric acid.

References

External links CDC - NIOSH Pocket Guide to Chemical Hazards

Illustrations

Worked examples

Example 1 — a first encounter with Trichloromethane sulfenyl chloride

Start with the simplest possible case. Write down what Trichloromethane sulfenyl chloride 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 Trichloromethane sulfenyl chloride 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 Trichloromethane sulfenyl chloride 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 Trichloromethane sulfenyl chloride

In research: Trichloromethane sulfenyl chloride 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 Trichloromethane sulfenyl chloride 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: Trichloromethane sulfenyl chloride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Foul-smelling chemicals, Organic compounds with 1 carbon atom, Organosulfur compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Trichloromethane sulfenyl chloride 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 Trichloromethane sulfenyl chloride in 20 minutes

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

Frequently asked questions

What is Trichloromethane sulfenyl chloride in simple terms?

Why does Trichloromethane sulfenyl chloride 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 Trichloromethane sulfenyl chloride?

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 Trichloromethane sulfenyl chloride.