chemistry

Subpsoromic acid

Subpsoromic acid 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 Subpsoromic acid rather than just read about it. In short: Subpsoromic acid is a depsidone with the molecular formula C17H12O8 that was originally isolated from the lichen species Ocellularia praestans. It belongs to a small subclass of depsidones that combine a β-orcinol A-ring with an orcinol B-ring; few other natural products share that architectural motif.

Key takeaways

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

Reference excerpt

Subpsoromic acid is a depsidone with the molecular formula C17H12O8 that was originally isolated from the lichen species Ocellularia praestans. It belongs to a small subclass of depsidones that combine a β-orcinol A-ring with an orcinol B-ring; few other natural products share that architectural motif.

Natural occurrence and isolation The compound was discovered during a thin-layer chromatographic survey of O. praestans thalli collected on tree bark in Brazil's coastal Restinga forest . Soxhlet extraction of 0.39 g of dried material with anhydrous diethyl ether, followed by preparative-layer chromatography, yielded 2.4 mg of pure subpsoromic acid—about 0.6 % of the dry thallus mass. The product formed colourless crystals that decomposed above 350 °C, and its homogeneity was confirmed by high-performance liquid chromatography and proton nuclear magnetic resonance. The compound has since been reported as a minor metabolite in Herpothallon rubroechinatum and in Acanthothecis verrucosa.

Structure and chemical properties High-resolution mass spectrometry established the molecular formula and showed that subpsoromic acid contains one fewer methylene unit than the better-known psoromic acid. One- and two-dimensional NMR spectra revealed a single carbon-bound methyl group (δ 2.54 ppm), one methoxy group (δ 3.83 ppm), two meta-coupled aromatic protons, an aldehydic proton (δ 10.56 ppm), and a strongly chelated phenolic hydroxyl (δ 12.36 ppm). These data, together with diagnostic mass spectral fragments at m/z 179 and 177 arising from the A-ring, support the structure 4-formyl-3-hydroxy-8-methoxy-1-methyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-6-carboxylic acid. The compound's thin-layer chromatography Rf values (0.34–0.38 in standard solvent systems) and HPLC retention index (RI 14; RT ≈ 21.6 min) further permit routine analytical identification.

References

Illustrations

Worked examples

Example 1 — a first encounter with Subpsoromic acid

Start with the simplest possible case. Write down what Subpsoromic acid 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 Subpsoromic acid 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 Subpsoromic acid 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 Subpsoromic acid

In research: Subpsoromic acid 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 Subpsoromic acid 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: Subpsoromic acid is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aromatic acids, Aromatic aldehydes, Dibenzodioxepines, so understanding it makes those chapters shorter.
In everyday life: Look for Subpsoromic acid 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 Subpsoromic acid in 20 minutes

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

Frequently asked questions

What is Subpsoromic acid in simple terms?

Why does Subpsoromic acid 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 Subpsoromic acid?

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 Subpsoromic acid.