mathematics

Sulfonamide

Sulfonamide is a mathematics 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 Sulfonamide rather than just read about it. In short: In organic chemistry, the sulfonamide functional group (also spelled sulphonamide) is an organosulfur group with the structure R−S(=O)2−NR2. It consists of a sulfonyl group (O=S=O) connected to an amine group (−NH2).

Key takeaways

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

Reference excerpt

In organic chemistry, the sulfonamide functional group (also spelled sulphonamide) is an organosulfur group with the structure R−S(=O)2−NR2. It consists of a sulfonyl group (O=S=O) connected to an amine group (−NH2). Relatively speaking this group is unreactive. Because of the rigidity of the functional group, sulfonamides are typically crystalline; for this reason, the formation of a sulfonamide is a classic method to convert an amine into a crystalline derivative which can be identified by its melting point. Many important drugs contain the sulfonamide group. A sulfonamide (compound) is a chemical compound that contains this group. The general formula is R−SO2NR'R" or R−S(=O)2−NR'R", where each R is some organic group; for example, "methanesulfonamide" (where R = methane, R' = R" = hydrogen) is CH3SO2NH2. Any sulfonamide can be considered as derived from a sulfonic acid by replacing a hydroxyl group (−OH) with an amine group. In medicine, the term "sulfonamide" is sometimes used as a synonym for sulfa drug, a derivative or variation of sulfanilamide. The first sulfonamide was discovered in Germany in 1932.

Synthesis and reactions Sulfonamides can be prepared in the laboratory in many ways. The classic approach entails the reaction of sulfonyl chlorides with an amine.

RSO2Cl + R'2NH → RSO2NR'2 + HCl A base such as pyridine is typically added to absorb the HCl that is generated. Illustrative is the synthesis of sulfonylmethylamide. The reaction of primary and secondary amines with benzenesulfonyl chloride is the basis of the Hinsberg reaction, a method for detecting primary and secondary amines. Sulfonamides undergo a variety of acid-base reactions. The N-H bond can be deprotonated. The alkylsulfonamides can be deprotonated at carbon. Arylsulfonamides undergo ortho-lithiation.

Sultams

Sultams are cyclic sulfonamides. Bioactive sultams include the antiinflammatory ampiroxicam and the anticonvulsant sulthiame. Sultams are prepared analogously to other sulfonamides, allowing for the fact that sulfonic acids are deprotonated by amines. They are often prepared by one-pot oxidation of disulfides or thiols linked to amines. An alternative synthesis of sultams involves initial preparation of a linear sulfonamide, followed by intramolecular C-C bond formation (i.e. cyclization), a strategy that was used in the synthesis of a sultam-based deep-blue emitter for organic electronics.

Disulfonimides The disulfonimides are of the type R−S(=O)2−N(H)−S(=O)2−R' with two sulfonyl groups flanking an amine. As with sulfinamides, this class of compounds is used as catalysts in enantioselective synthesis. Bis(trifluoromethanesulfonyl)aniline is a source of the triflyl (CF3SO+2) group.

See also Sulfamide — the sulfonamide parent compound Sulfamic acid — HOSO2NH2 Sulfinamide — compounds of the form RS(=O)NR′R″

References

Further reading Greenwood, David. Antimicrobial Drugs: Chronicle of a twentieth century medical triumph (Oxford University Press, 2008) popular history; summary

Illustrations

Worked examples

Example 1 — a first encounter with Sulfonamide

Start with the simplest possible case. Write down what Sulfonamide claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In mathematics, 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 Sulfonamide 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 Sulfonamide 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 Sulfonamide

In research: Sulfonamide appears in mathematics 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 Sulfonamide 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: Sulfonamide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Functional groups, Sulfonamides, so understanding it makes those chapters shorter.
In everyday life: Look for Sulfonamide 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 Sulfonamide in 20 minutes

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

Frequently asked questions

What is Sulfonamide in simple terms?

Why does Sulfonamide matter?

Because it connects several mathematics 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 Sulfonamide?

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 Sulfonamide.