chemistry

Furazan

Furazan 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 Furazan rather than just read about it. In short: Furazan, or 1,2,5-oxadiazole, is a heterocyclic aromatic organic compound consisting of a five-atom ring containing 1 oxygen and 2 nitrogen atoms. The furazan ring system is also found in the steroid furazabol.

Key takeaways

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

Reference excerpt

Furazan, or 1,2,5-oxadiazole, is a heterocyclic aromatic organic compound consisting of a five-atom ring containing 1 oxygen and 2 nitrogen atoms. The furazan ring system is also found in the steroid furazabol. Furazan and its derivatives are obtained from the oxime derivatives of 1,2-diketones.

Synthesis In theory the simplest means of producing furazan is the cyclic-dehydration of glyoxime (the di-oxime of glyoxal), but the instability of furazan to high temperature or extremes of pH requires that this process be performed carefully. The formation of furazan from glyoxime is also exothermic and takes place with the copious evolution of noxious gases. The reaction may be achieved by heating glyoxime to 150 °C in the presence of succinic anhydride. Furazan will evaporate at that temperature, which continuously removes the product from the reaction mixture.

Derivatives

3,4-Dimethylfurazan 3,4-Dimethylfurazan (b.p. 154–159 °C) is prepared by an analogous process by dehydrating dimethylglyoxime. A variety of related derivatives are known, including diphenyl- and methylethylfurazan.

Carboxylic acid derivatives Potassium permanganate oxidizes 3,4-dimethylfurazan first to methylfurazancarboxylic acid and then to furazandicarboxylic acid. By warming oxyfurazan acetic acid with excess of potassium permanganate, oxyfurazancarboxylic acid is obtained. It crystallizes as prisms (m.p. 175 °C). Furazancarboxylic acid (m.p. 107 °C) is prepared by oxidation of furazanpropionic acid with potassium permanganate. It dissolves in base to give nitrosocyanacetate.

Diaminofurazan The energetic precursor, diaminofurazan, can be prepared by heating diaminoglyoxime with potassium hydroxide followed by cooling to give white crystals. Like many other furazans, diaminofurazan forms stable complexes with copper(II) salts.

Furoxan Furoxan may be formed by dimerization of nitrile oxides

References

Chisholm, Hugh, ed. (1911). "Furazanes" . Encyclopædia Britannica. Vol. 11 (11th ed.). Cambridge University Press. p. 357.

Illustrations

Worked examples

Example 1 — a first encounter with Furazan

Start with the simplest possible case. Write down what Furazan 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 Furazan 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 Furazan 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 Furazan

In research: Furazan 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 Furazan 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: Furazan is common in secondary-school and first-year university syllabi. It links to neighbouring topics Organic compounds with 2 carbon atoms, Oxadiazoles, so understanding it makes those chapters shorter.
In everyday life: Look for Furazan 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 Furazan in 20 minutes

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

Frequently asked questions

What is Furazan in simple terms?

Why does Furazan 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 Furazan?

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 Furazan.