chemistry

Naphyrone

Naphyrone 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 Naphyrone rather than just read about it. In short: Naphyrone, also known as O-2482 and naphthylpyrovalerone, is a stimulant drug of the cathinone and naphthylaminopropane families. It was derived from pyrovalerone and acts as a serotonin–norepinephrine–dopamine reuptake inhibitor (SNDRI).

Key takeaways

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

Reference excerpt

Naphyrone, also known as O-2482 and naphthylpyrovalerone, is a stimulant drug of the cathinone and naphthylaminopropane families. It was derived from pyrovalerone and acts as a serotonin–norepinephrine–dopamine reuptake inhibitor (SNDRI). Naphyrone has been reported as a novel designer drug. No safety or toxicity data is available on the drug. The drug has been marketed under the name "NRG-1," although only a minority of samples of substances sold under this name have been found to actually contain naphyrone, and even samples that proved to contain genuine β-naphyrone were in some cases also found to contain the 1-naphthyl isomer α-naphyrone in varying proportions, further confusing the reported effects profile.

Use in the United Kingdom Naphyrone emerged as a new legal high in the United Kingdom only months after the ban of similar drug mephedrone (which was also a cathinone derivative). Until July 2010 the substance was not controlled by the Misuse of Drugs Act 1971 and was therefore not illegal for someone to possess. The Medicines Act prevented naphyrone from being sold for human consumption, and therefore it was sometimes sold as 'pond cleaner' or as another substance not normally consumed by humans. A study by researchers at Liverpool John Moores University found that only one out of ten products labelled as "NRG-1" actually contained naphyrone when they were subjected to laboratory analysis. Compounds found in products labelled NRG-1 included MDPV, flephedrone, mephedrone, butylone and caffeine, one product tested was inorganic in composition. In the case of an individual possessing a product labelled NRG-1 that contains MDPV or other illegal substances, they are in possession of a controlled substance. On 12 July 2010, the Home Office announced that naphyrone had been banned and made a Class B drug, following a report from the Advisory Council on the Misuse of Drugs.

Pharmacology As a triple reuptake inhibitor, naphyrone has been shown in vitro to affect the reuptake of the neurotransmitters serotonin, dopamine and norepinephrine by interacting with the serotonin transporter (SERT), dopamine transporter (DAT), and norepinephrine transporter (NET). One study found that the dissociation constant of naphyrone interacting with SERT is 33.1 nM ± 1.1, with DAT is 20.1 nM ± 7.1 and with NET is 136 nM ± 27. The concentration of naphyrone required to inhibit the transporters by 50% is 46.0 nM ± 5.5 for SERT, 40.0 nM ± 13 for DAT and 11.7 nM ± 0.9 for NET. Of a number of pyrovalerone analogues tested, naphyrone was found to be the only serotonin–norepinephrine–dopamine reuptake inhibitor found to be active at nM concentrations. Some samples of β-naphyrone sold have also been found to contain the alternative isomer α-naphyrone, presumably produced accidentally as an impurity in synthesis. The in vitro data available in the scientific literature was all obtained using pure β-naphyrone, and the pharmacological properties of α-naphyrone are unknown, further complicating the pharmacological profile of this little-studied designer drug.

Legal status

Finland Naphyrone is scheduled in the "government decree on psychoactive substances banned from the consumer market".

See also α-PVP α-Pyrrolidinopentiothiophenone (α-PVT) BMAPN HDEP-28 HDMP-28 (methylnaphthidate) MDPV Naphthylisopropylamine Naphthylpropylaminopentane N,O-Dimethyl-4-(2-naphthyl)piperidine-3-carboxylate 2β-Propanoyl-3β-(2-naphthyl)-tropane (WF-23) O-2390 Pronethalol Pyrovalerone TH-PVP

References

Illustrations

Worked examples

Example 1 — a first encounter with Naphyrone

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

In research: Naphyrone 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 Naphyrone 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: Naphyrone is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2-Naphthyl compounds, Alpha-Propylphenethylamines, Cathinones, so understanding it makes those chapters shorter.
In everyday life: Look for Naphyrone 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 Naphyrone in 20 minutes

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

Frequently asked questions

What is Naphyrone in simple terms?

Why does Naphyrone 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 Naphyrone?

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 Naphyrone.