mathematics

Vinyl group

Vinyl group is a mathematics 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 Vinyl group rather than just read about it. In short: In organic chemistry, a vinyl group (abbr. Vi; IUPAC name: ethenyl group) is a functional group with the formula −CH=CH2.

Key takeaways

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

Reference excerpt

In organic chemistry, a vinyl group (abbr. Vi; IUPAC name: ethenyl group) is a functional group with the formula −CH=CH2. It is the ethylene (IUPAC name: ethene) molecule (H2C=CH2) with one fewer hydrogen atom. The name is also used for any compound containing that group, namely R−CH=CH2 where R is any other group of atoms. An industrially important example is vinyl chloride, precursor to PVC, a plastic commonly known as vinyl.

Vinyl is one of the alkenyl functional groups. On a carbon skeleton, sp2-hybridized carbons or positions are often called vinylic. Allyls, acrylates and styrenics contain vinyl groups. (A styrenic crosslinker with two vinyl groups is called divinyl benzene.)

Vinyl polymers

Vinyl groups can polymerize with the aid of a radical initiator or a catalyst, forming vinyl polymers. Vinyl polymers contain no vinyl groups. Instead they are saturated. The following table gives some examples of vinyl polymers.

Synthesis and reactivity Vinyl derivatives are alkenes. If activated by an adjacent group, the increased polarization of the bond gives rise to characteristic reactivity, which is termed vinylogous:

In allyl compounds, where the next carbon is saturated but substituted once, allylic rearrangement and related reactions are observed. Allyl Grignard reagents (organomagnesiums) can attack with the vinyl end first. If next to an electron-withdrawing group, conjugate addition (Michael addition) can occur. Vinyl organometallics, e.g. vinyllithium and vinyl tributyltin, participate in vinylations including coupling reactions such as in Negishi coupling.

History and etymology The radical was first reported by Henri Victor Regnault in 1835 and initially named aldehydène. Due to the incorrect measurement of the atomic mass of carbon it was believed to be C4H6 at the time. Then in 1839 it was renamed by Justus von Liebig to "acetyl", because he believed it to be the radical of the acetic acid. The modern term was coined by German chemist Hermann Kolbe in 1851, who rebutted Liebig's hypothesis. However even in 1860 Marcellin Berthelot still based the name he coined for acetylene on Liebig's nomenclature and not on Kolbe's. The etymology of "vinyl" is the Latin vinum = "wine", and the Greek word "hylos" 'υλος (matter or material), because of its relationship with ethyl alcohol.

See also Acetylenic Allylic/Homoallylic Alpha-olefin Benzylic Propargylic/Homopropargylic Vinylogous

References

Illustrations

Worked examples

Example 1 — a first encounter with Vinyl group

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

In research: Vinyl group appears in mathematics 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 Vinyl group 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: Vinyl group is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alkenyl groups, Functional groups, Monomers, so understanding it makes those chapters shorter.
In everyday life: Look for Vinyl group 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 Vinyl group in 20 minutes

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

Frequently asked questions

What is Vinyl group in simple terms?

In organic chemistry, a vinyl group (abbr. Vi; IUPAC name: ethenyl group) is a functional group with the formula −CH=CH2.

Why does Vinyl group matter?

Because it connects several mathematics 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 Vinyl group?

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 Vinyl group.