chemistry

Sulfuryl chloride

Sulfuryl 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 Sulfuryl chloride rather than just read about it. In short: Sulfuryl chloride is an inorganic compound with the formula SO2Cl2. At room temperature, it is a colorless liquid with a pungent odor.

Key takeaways

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

Reference excerpt

Sulfuryl chloride is an inorganic compound with the formula SO2Cl2. At room temperature, it is a colorless liquid with a pungent odor. Sulfuryl chloride is not found in nature. Sulfuryl chloride is commonly confused with thionyl chloride, SOCl2. The properties of these two sulfur oxychlorides are quite different: sulfuryl chloride is a source of chlorine whereas thionyl chloride is a source of chloride ions. An alternative IUPAC name is sulfuryl dichloride. Sulfur is tetrahedral in SO2Cl2 and the oxidation state of the sulfur atom is +6, as in sulfuric acid.

Synthesis SO2Cl2 is prepared by the reaction of sulfur dioxide and chlorine in the presence of a catalyst, such as activated carbon.

SO2 + Cl2 → SO2Cl2 The product can be purified by fractional distillation.

Legacy routes Sulfuryl chloride was first prepared in 1838 by the French chemist Henri Victor Regnault. Older routes include oxidation of thionyl chloride:

5 SOCl2 + HgO → ClSSCl + HgCl2 + 3 SO2Cl2 2 SOCl2 + MnO2 → SO2 + MnCl2 + SO2Cl2

Reactions Sulfuryl chloride reacts with water, releasing hydrogen chloride gas and sulfuric acid:

2 H2O + SO2Cl2 → 2 HCl + H2SO4 For sulfuryl chloride, this happens at room temperature, but the related sulfuryl fluoride does not hydrolyse at temperatures up to 150 °C. SO2Cl2 will also decompose when heated to or above 100 °C, about 30 °C above its boiling point. Upon standing, SO2Cl2 decomposes to sulfur dioxide and chlorine, which gives the older samples a slightly yellowish color. SO2Cl2 can be used as a source of chlorine in alkane radical chlorination, initiated chemically (usually by peroxide) or by light:

CH4 + SO2Cl2 → CH3Cl + SO2 + HCl

Uses Sulfuryl chloride is used as a source of Cl2. Because it is a pourable liquid, it is considered more convenient than Cl2 to dispense. Sulfuryl chloride is used in the conversion of C−H to C−Cl adjacent to activating substituents such as carbonyls and sulfoxides:

RC(O)CH2R' + SO2Cl2 → RC(O)CHClR' + HCl + SO2 It also chlorinates alkanes, alkenes, alkynes, aromatics, ethers (such as tetrahydrofuran) and epoxides. Such reactions occur under free radical conditions using an initiator such as AIBN. It convert thiols or disulfides into the corresponding sulfenyl chlorides:

RSH + SO2Cl2 → RSCl + HCl + SO2 Occasionally, sulfinyl chlorides result from such reactions. SO2Cl2 can also convert alcohols to alkyl chlorides. In industry, sulfuryl chloride is most used in producing pesticides. Phosphorus pentachloride is prepared by the reaction of white phosphorus with sulfuryl chloride. Sulfuryl chloride can also be used to treat wool to prevent shrinking.

Precautions Sulfuryl chloride is toxic, corrosive, and acts as a lachrymator. It releases hydrogen chloride upon contact with water, as well as donor solvents such as dimethyl sulfoxide and dimethylformamide.

See also Disulfuryl chloride Trisulfuryl chloride

References

Illustrations

Worked examples

Example 1 — a first encounter with Sulfuryl chloride

Start with the simplest possible case. Write down what Sulfuryl 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 Sulfuryl 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 Sulfuryl 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 Sulfuryl chloride

In research: Sulfuryl 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 Sulfuryl 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: Sulfuryl chloride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Oxychlorides, Sulfur oxohalides, Sulfuryl compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Sulfuryl 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 Sulfuryl chloride in 20 minutes

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

Frequently asked questions

What is Sulfuryl chloride in simple terms?

Sulfuryl chloride is an inorganic compound with the formula SO2Cl2. At room temperature, it is a colorless liquid with a pungent odor.

Why does Sulfuryl 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 Sulfuryl 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 Sulfuryl chloride.