chemistry

Troparil

Troparil 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 Troparil rather than just read about it. In short: Troparil (also known as (–)-2β-Carbomethoxy-3β-phenyltropane, WIN 35,065-2, or β-CPT) is a stimulant drug used in scientific research. Troparil is a phenyltropane-based dopamine reuptake inhibitor (DRI) that is derived from methylecgonidine.

Key takeaways

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

Reference excerpt

Troparil (also known as (–)-2β-Carbomethoxy-3β-phenyltropane, WIN 35,065-2, or β-CPT) is a stimulant drug used in scientific research. Troparil is a phenyltropane-based dopamine reuptake inhibitor (DRI) that is derived from methylecgonidine. Troparil is a few times more potent than cocaine as a dopamine reuptake inhibitor, but is less potent as a serotonin reuptake inhibitor, and has a duration spanning a few times longer, since the phenyl ring is directly connected to the tropane ring through a non-hydrolyzable carbon-carbon bond. The lack of an ester linkage removes the local anesthetic action from the drug, so troparil is a pure stimulant. This change in activity also makes troparil slightly less cardiotoxic than cocaine. The most commonly used form of troparil is the tartrate salt, but the hydrochloride and naphthalenedisulfonate salts are also available, as well as the free base.

Background The first known published synthesis of troparil and the related compound WIN 35428 is by Clarke and co-workers during the 1970s. Apparently, it was their intention to separate the stimulant actions of cocaine from its toxicity and dependence liability. Troparil is the only regular phenyltropane having a NET affinity that exceeds the DAT affinity.

Application Phenyltropanes are likely to have less abuse and dependency compared with cocaine. Troparil is used in scientific research into the dopamine reuptake transporter. 3H-radiolabelled forms of troparil have been used in humans and animals to map the distribution of dopamine transporters in the brain. It is also used for animal research into stimulant drugs as an alternative to cocaine which produces similar effects, but avoids the stringent licensing requirements for the use of cocaine itself. Troparil has similar effects to cocaine in animal studies, but recreational use of this compound to date has proven extremely rare. Despite being easily made by the reaction of methylecgonidine with phenylmagnesium bromide, the relative scarcity of methylecgonidine and the demanding reaction conditions required for the synthesis put production of this compound beyond the capacity of most illicit drug manufacturers, and legitimate supplies of troparil are available only in very small quantities for a very high price.

Legality The legal status of troparil is unclear, but it may be considered a controlled substance analog of cocaine in the United States on the grounds of its related chemical structure. The legal status of troparil and many other cocaine analogs in Canada, is dependent on if ecgonine, coca, or cocaine were derivatives of the compound, according to the wording on the entry of coca in Schedule 1 of the Controlled Drugs and Substances Act.

See also List of phenyltropanes List of cocaine analogues Amfonelic acid

References

Illustrations

Worked examples

Example 1 — a first encounter with Troparil

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

In research: Troparil 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 Troparil 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: Troparil is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dopamine reuptake inhibitors, Drugs not assigned an ATC code, Phenyl compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Troparil 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 Troparil in 20 minutes

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

Frequently asked questions

What is Troparil in simple terms?

Why does Troparil 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 Troparil?

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 Troparil.