chemistry

Griseoxanthone C

Griseoxanthone C 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 Griseoxanthone C rather than just read about it. In short: Griseoxanthone C is an organic compound in the structural class of chemicals known as xanthones. Its chemical formula is 1,6-dihydroxy-3-methoxy-8-methylxanthen-9-one, and its molecular formula is C15H12O5.

Key takeaways

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

Reference excerpt

Griseoxanthone C is an organic compound in the structural class of chemicals known as xanthones. Its chemical formula is 1,6-dihydroxy-3-methoxy-8-methylxanthen-9-one, and its molecular formula is C15H12O5. It is found in a plant and some fungi, including a lichen.

History Griseoxanthone C was first isolated from the fungus Penicillium patulum by McMaster and colleagues in 1960. They were investigating the biosynthesis of the somewhat structurally related compound griseofulvin and discovered it in the residual material of the growth medium containing the fungi. A year later, another group studying griseofulvin biosynthesis discovered that the production of griseoxanthone C could be induced by inhibiting the chlorination of griseophenone C (an intermediate in the biosynthetic pathway leading to griseofulvin), and that griseoxanthone C could be created chemically from griseophenone C. Jayalakshmi and colleagues proposed a chemical synthesis of griseoxanthone C in 1974.

Properties In its purified form, griseoxanthone C exists as yellowish needles with a melting point of 253–255 °C (487–491 °F). An ethanolic solution of griseoxanthone C reacts with iron(III) chloride to produce a violet-brown colour. Its ultraviolet spectrum has four peaks of maximum absorption (λmax) at 242, 269, 309, and 340 nm. In laboratory tests, griseoxanthone C showed strong antibiotic effects toward Bacillus subtilis and methicillin-resistant Staphylococcus aureus. It also has strong cytotoxicity to Hep2 liver cancer cells in in vitro experiments.

Occurrence In 1992, John Elix and Caroline Crook reported griseoxanthone C from the lichen Lecanora vinetorum. It has since been reported from various other species, including the flowers of the plant Ficus hookeriana, the fungi Fusarium equiseti, Penicillium concentricum, and Urocladium.

Illustrations

Worked examples

Example 1 — a first encounter with Griseoxanthone C

Start with the simplest possible case. Write down what Griseoxanthone C 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 Griseoxanthone C 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 Griseoxanthone C 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 Griseoxanthone C

In research: Griseoxanthone C 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 Griseoxanthone C 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: Griseoxanthone C is common in secondary-school and first-year university syllabi. It links to neighbouring topics Hydroxyarenes, Lichen products, Methoxy compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Griseoxanthone C 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 Griseoxanthone C in 20 minutes

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

Frequently asked questions

What is Griseoxanthone C in simple terms?

Why does Griseoxanthone C 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 Griseoxanthone C?

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 Griseoxanthone C.