chemistry

Lilial

Lilial 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 Lilial rather than just read about it. In short: Lilial (a trade name for lily aldehyde, also known as lysmeral or lilestralis) is a chemical compound commonly used as a perfume in cosmetic preparations and laundry powders, often under the name butylphenyl methylpropional. It is an aromatic aldehyde, naturally occurring in crow-dipper and tomato plants, and produced synthetically in large scale.

Key takeaways

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

Reference excerpt

Lilial (a trade name for lily aldehyde, also known as lysmeral or lilestralis) is a chemical compound commonly used as a perfume in cosmetic preparations and laundry powders, often under the name butylphenyl methylpropional. It is an aromatic aldehyde, naturally occurring in crow-dipper and tomato plants, and produced synthetically in large scale. It was banned for use in cosmetics by the EU in March 2022 after being found to be harmful to fertility. It is also used as an intermediate in the synthesis of agrochemicals such as fenpropimorph and fenpropidin.

Synthesis Lilial is produced by the mixed aldol coupling of 4-tert-butylbenzaldehyde (typically as it's methanol acetal) and propionaldehyde, followed by hydrogenation.

Properties Lilial is commonly produced and sold as a racemic mixture; however, testing has indicated that the different enantiomers of the compound do not contribute equally to its odor. The (R)-enantiomer has a strong floral odor, reminiscent of cyclamen or lily of the valley; whereas the (S)-enantiomer possesses no strong odor.

Like most aldehydes, lilial is not long term stable and tends to slowly oxidize on storage.

Safety The Scientific Committee on Consumer Safety (SCCS, scientific committee for consumer safety of the EU Commission) concluded in May 2019 that the use of lilial in both rinse-off and leave-on cosmetics "cannot be considered as safe". After animal studies found it to be toxic for reproduction, it was reclassified as a prohibited substance in the EU, and banned from use in cosmetics as of March 2022. It can sometimes act as an allergen and may cause contact dermatitis in susceptible individuals. Lilial was used in many perfumes (examples: Byredo Inflorescence, Salvador Dali Laguna, Elizabeth Arden 5th Avenue, etc.) produced before 2022 as a synthetic substitute for the scent of lily of the valley. Due to the ban on the use of Lilial, safe analogues are currently used in perfume production.

Illustrations

Worked examples

Example 1 — a first encounter with Lilial

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

In research: Lilial 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 Lilial 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: Lilial is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aldehydes, Perfume ingredients, Tert-butyl compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Lilial 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 Lilial in 20 minutes

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

Frequently asked questions

What is Lilial in simple terms?

Why does Lilial 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 Lilial?

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 Lilial.