science

Norboletone

Norboletone is a science 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 Norboletone rather than just read about it. In short: Norboletone (INNTooltip International Nonproprietary Name) (former proposed brand name Genabol), or norbolethone, is a synthetic and orally active anabolic–androgenic steroid (AAS) which was never marketed. It was first developed in 1966 by Wyeth Laboratories and was investigated for use as an agent to encourage weight gain and for the treatment of short stature, but was never marketed commercially because of fears…

Key takeaways

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

Reference excerpt

Norboletone (INNTooltip International Nonproprietary Name) (former proposed brand name Genabol), or norbolethone, is a synthetic and orally active anabolic–androgenic steroid (AAS) which was never marketed. It was first developed in 1966 by Wyeth Laboratories and was investigated for use as an agent to encourage weight gain and for the treatment of short stature, but was never marketed commercially because of fears that it might be toxic. It subsequently showed up in urine tests on athletes in competition in the early 2000s. Norboletone was found to have been brought to the market by the chemist Patrick Arnold, of the Bay Area Laboratory Co-operative (BALCO), an American nutritional supplement company. It is reputed to have been the active ingredient in the original formulation of the "undetectable" steroid formulation known as "The Clear" before being replaced by the more potent drug tetrahydrogestrinone. In 2002, Don Catlin, the founder and then-director of the UCLA Olympic Analytical Lab, identified norboletone for the first time in an athlete's urine sample. In the same year, U.S. bicycle racer Tammy Thomas was caught using it and was banned from her sport. The following year, Catlin identified and developed a test for tetrahydrogestrinone (THG), the second reported designer anabolic sample—a key development in the BALCO Affair. Norboletone is on the World Anti-Doping Agency's list of prohibited substances, and is therefore banned from use in most major sports.

Chemistry

Synthesis Hughes & Smith reported the original synthesis of norboletone. Commercial: NB: Although the synthesis has involved the formation of no fewer than 6 chiral centers, only two of the possible 64 possible isomers are formed.

The halogenation of 3-(3-methoxyphenyl)propan-1-ol [7252-82-6] (1) with phosphorus tribromide gives 1-(3-bromopropyl)-3-methoxybenzene [6943-97-1] (2). Treatment with monosodium acetylide gives 5-m-methoxyphenylpent-1-yne [1424-70-0] (3) . (Ex 1) The Mannich reaction gives 1-Diethylamino-6-m-methoxyphenylhex-2-yne, PC21485597 (4). (Ex 8) The oxymercuration reaction with mercury(II) sulfate in aqueous sulfuric acid gives a mixture of 1-(Diethylamino)-6-(3-methoxyphenyl)hexan-3-one [3706-69-2] (5) and 6-m-Methoxyphenylhex-1-en-3-one, PC10798238 (6). (Ex 17) Treatment with 2-Ethyl-1,3-cyclopentanedione [823-36-9] (7) in the presence of pyridine base causes a Michael reaction to occur to give 2-Ethyl-2-[6-(m-methoxyphenyl)-3-oxohexyl]-1,3-cyclopentanedione, PC21485569 (8). (Ex 43) The cyclodehydration step was achieved by refluxing with a catalytic amount of TsOH in a DS-trap to give [848-07-7] (9). (Ex 68) Catalytic hydrogenation over Raney nickel gives (10). (Ex 83) Ethynylation with ethynyl lithium gave (11). (Ex 96) Catalytic hydrogenation gave (12). (Ex 104) Reduction of the remaining olefin gave PC68145890 (13). Birch reduction gave PC68144974 (14). (Ex 172 & 188) Hydrolysis of the enol ether in mineral acid completed the synthesis of norboletone (15).

See also Norgestrel is the unreduced alkyne (ethynyl group).

References

Illustrations

Worked examples

Example 1 — a first encounter with Norboletone

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

In research: Norboletone appears in science 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 Norboletone 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: Norboletone is common in secondary-school and first-year university syllabi. It links to neighbouring topics Abandoned drugs, Androgens, Designer drugs, so understanding it makes those chapters shorter.
In everyday life: Look for Norboletone 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 Norboletone in 20 minutes

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

Frequently asked questions

What is Norboletone in simple terms?

Why does Norboletone matter?

Because it connects several science 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 Norboletone?

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 Norboletone.