chemistry

Substituted β-hydroxyamphetamine

Substituted β-hydroxyamphetamine 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 Substituted β-hydroxyamphetamine rather than just read about it. In short: Substituted β-hydroxyamphetamines, or simply β-hydroxyamphetamines, also known as phenylisopropanolamines, phenylpropanolamines, norephedrines, or cathinols, are derivatives of β-hydroxyamphetamine with one or more chemical substituents. They are substituted phenethylamines, phenylethanolamines (β-hydroxyphenethylamines), and amphetamines (α-methylphenethylamines), and are closely related to but distinct from the su…

Key takeaways

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

Reference excerpt

Substituted β-hydroxyamphetamines, or simply β-hydroxyamphetamines, also known as phenylisopropanolamines, phenylpropanolamines, norephedrines, or cathinols, are derivatives of β-hydroxyamphetamine with one or more chemical substituents. They are substituted phenethylamines, phenylethanolamines (β-hydroxyphenethylamines), and amphetamines (α-methylphenethylamines), and are closely related to but distinct from the substituted cathinones (β-ketoamphetamines). Examples of β-hydroxyamphetamines include the β-hydroxyamphetamine stereoisomers phenylpropanolamine and cathine and the stereospecific N-methylated β-hydroxyamphetamine derivatives ephedrine and pseudoephedrine, among many others. In terms of pharmacological activity, the β-hydroxyamphetamines include indirectly acting norepinephrine and dopamine releasing agents and directly acting α- and β-adrenergic receptor agonists, among other actions. In contrast to their amphetamine counterparts, ephedrine and 4-fluoroephedrine are not agonists of the human trace amine-associated receptor 1 (TAAR1). With regard to medical and other uses, β-hydroxyamphetamines are employed as sympathomimetics, decongestants, bronchodilators, vasoconstrictors, vasodilators, tocolytics, antitussives, cardiac stimulants, antihypotensive agents, appetite suppressants, psychostimulants, wakefulness-promoting agents, antidepressants, euphoriants or recreational drugs, and performance-enhancing drugs (in exercise and sports), among others. β-Hydroxyamphetamines have increased hydrophilicity and lower lipophilicity relative to their amphetamine counterparts owing to their β-hydroxyl group. For comparison, the predicted log P (XLogP3) of amphetamine is 1.8, of β-hydroxyamphetamine is 0.8, and of cathinone is 1.1. As a result of their reduced lipophilicity, they are generally less able to cross the blood–brain barrier and show greater peripheral selectivity in comparison to the corresponding amphetamine analogues. This makes the β-hydroxyamphetamines less applicable for use as centrally-acting agents but more applicable for peripherally-specific uses such as sympathomimetic stimulation. Besides different physicochemical properties, there is also a large drop in the potency of β-hydroxyamphetamines as monoamine releasing agents in vitro relative to amphetamines and cathinones.

List of substituted β-hydroxyamphetamines

Side-chain-cyclized substituted β-hydroxyamphetamines Some β-hydroxyamphetamines have had their side chain extended and cyclized. Examples include certain substituted phenylmorpholines like phenmetrazine and phendimetrazine and their analogues; substituted phenylmorpholines related to bupropion like radafaxine (cyclized (2S,3S)-hydroxybupropion) and manifaxine; certain substituted aminorexes like 4-methylaminorex and 4,4'-dimethylaminorex; and other compounds including cilobamine, diphenylprolinol, ifenprodil, levophacetoperane, pipradrol, rimiterol, traxoprodil, vibegron, and zilpaterol.

Activity profiles

See also Substituted amphetamine Substituted methylenedioxyphenethylamine Substituted cathinone Substituted phenylmorpholine 2Cs, DOx, 25-NB Substituted benzofurans List of aminorex analogues List of methylphenidate analogues Substituted tryptamine Substituted α-alkyltryptamines PiHKAL

References

Illustrations

Worked examples

Example 1 — a first encounter with Substituted β-hydroxyamphetamine

Start with the simplest possible case. Write down what Substituted β-hydroxyamphetamine 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 Substituted β-hydroxyamphetamine 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 Substituted β-hydroxyamphetamine 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 Substituted β-hydroxyamphetamine

In research: Substituted β-hydroxyamphetamine 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 Substituted β-hydroxyamphetamine 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: Substituted β-hydroxyamphetamine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Beta-Hydroxyamphetamines, Chemical classes of psychoactive drugs, so understanding it makes those chapters shorter.
In everyday life: Look for Substituted β-hydroxyamphetamine 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 Substituted β-hydroxyamphetamine in 20 minutes

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

Frequently asked questions

What is Substituted β-hydroxyamphetamine in simple terms?

Why does Substituted β-hydroxyamphetamine 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 Substituted β-hydroxyamphetamine?

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 Substituted β-hydroxyamphetamine.