chemistry

Sulfinyl halide

Sulfinyl halide 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 Sulfinyl halide rather than just read about it. In short: Sulfinyl halide have the general formula R−S(O)−X, where X is a halogen. They are intermediate in oxidation level between sulfenyl halides, R−S−X, and sulfonyl halides, R−SO2−X.

Key takeaways

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

Reference excerpt

Sulfinyl halide have the general formula R−S(O)−X, where X is a halogen. They are intermediate in oxidation level between sulfenyl halides, R−S−X, and sulfonyl halides, R−SO2−X. The best known examples are sulfinyl chlorides, thermolabile, moisture-sensitive compounds, which are useful intermediates for preparation of other sufinyl derivatives such as sulfinamides, sulfinates, sulfoxides, and thiosulfinates. Unlike the sulfur atom in sulfonyl halides and sulfenyl halides, the sulfur atom in sulfinyl halides is chiral, as shown for methanesulfinyl chloride.

Sulfinyl chlorides Sulfinic acid chlorides, or sulfinyl chlorides, are sulfinyl halides with the general formula R−S(O)−Cl. Methanesulfinyl chloride, CH3S(O)Cl, is prepared by chlorination of dimethyl disulfide to give CH3SCl3, which is treated with acetic anhydride. It is a straw-colored liquid. Arylsulfinyl chlorides are prepared by Friedel-Crafts reaction with thionyl chloride, or comproportionation of an arylsulfonate with the same. For example, toluenesulfinyl chloride is prepared by treating sodium tosylate with thionyl chloride. Also a straw-colored liquid, it boils near 100 °C at 0.5 mm Hg. A general approach to the formation of sulfinyl chlorides is by reaction of the corresponding thiol with sulfuryl chloride, SO2Cl2; in cases where the sulfenyl chloride, RSCl, results instead, a trifluoroperacetic acid oxidation affords the desired product, as in the case of 2,2,2-trifluoro-1,1-diphenylethanethiol:

Reactions These compounds react readily with nucleophiles like water, alcohols, amines, thiols, and Grignard reagents. If the nucleophile is water the product is a sulfinic acid, if it is an alcohol the product is a sulfinic ester, if it is a primary or secondary amine the product is a sulfinamide, if it is a thiol the product is a thiosulfinate, while if it is a Grignard reagent the product is a sulfoxide. Because of their reactivity and instability, alkanesulfinyl chlorides are generally used without purification immediately after their synthesis. Storage is not recommended since pressure develops within the container due to hydrogen chloride release. Treatment of alkanesulfinyl chlorides having α-hydrogens with tertiary amine bases gives thiocarbonyl S-oxides (sulfines) as isolable compounds. Thus, treatment of n-propanesulfinyl chloride with triethylamine gives syn-propanethial-S-oxide, the lachrymatory agent of the onion. Treatment of methanesulfinyl chloride or ethane-1,2-bis-sulfinyl chloride, ClS(O)CH2CH2S(O)Cl (prepared by oxidative chlorination of 1,2-ethanedithiol, HSCH2CH2SH), with a tertiary amine in the presence of the chiral glucose-derived secondary alcohol diacetone-D-glucose affords optically pure sulfinate esters by a process of Dynamic kinetic resolution. Sulfinyl chlorides undergo Friedel–Crafts reactions with arenes giving sulfoxides.

Sulfinyl fluorides, bromides, and iodides Room temperature hydrolysis of CF3SF3 gives the sulfinyl fluoride CF3S(O)F in a few hours in quantitative yield. Treatment of CF3S(O)F with hydrogen bromide at −78 °C gives the sulfinyl bromide CF3S(O)Br, which is unstable at room temperature and readily disproportionates. Sulfinyl iodides are apparently unknown compounds.

References

Illustrations

Worked examples

Example 1 — a first encounter with Sulfinyl halide

Start with the simplest possible case. Write down what Sulfinyl halide 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 Sulfinyl halide 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 Sulfinyl halide 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 Sulfinyl halide

In research: Sulfinyl halide 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 Sulfinyl halide 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: Sulfinyl halide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Halides, Organosulfur compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Sulfinyl halide 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 Sulfinyl halide in 20 minutes

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

Frequently asked questions

What is Sulfinyl halide in simple terms?

Sulfinyl halide have the general formula R−S(O)−X, where X is a halogen. They are intermediate in oxidation level between sulfenyl halides, R−S−X, and sulfonyl halides, R−SO2−X.

Why does Sulfinyl halide 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 Sulfinyl halide?

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 Sulfinyl halide.