4-Pyrone on treatment with acid gets protonated on the carbonyl group oxygen to yield a stable product. Why the structure is so stable is to be explained using resonance structures and the Huckel’s (4n+2) rule. Concept introduction: A compound to become aromatic should obey Huckel’s rule. According to Huckel’s rule, any specie that is cyclic, planar and has (4n+2) delocalized Ï€ electrons will be aromatic and stable. Thus species with 2, 6, 10, 14 etc. Ï€ electrons will be aromatic and stable. To explain: Using resonance structures and the Huckel’s (4n+2) rule why the protonated product obtained when 4-pyrone reacts with acid is so stable.

Question

Which carbocation is more stable?

Answer 1

Question

Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 15.SE, Problem 42AP

Interpretation Introduction

Interpretation:

4-Pyrone on treatment with acid gets protonated on the carbonyl group oxygen to yield a stable product. Why the structure is so stable is to be explained using resonance structures and the Huckel’s (4n+2) rule.

Concept introduction:

A compound to become aromatic should obey Huckel’s rule. According to Huckel’s rule, any specie that is cyclic, planar and has (4n+2) delocalized Ï€ electrons will be aromatic and stable. Thus species with 2, 6, 10, 14 etc. Ï€ electrons will be aromatic and stable.

To explain:

Using resonance structures and the Huckel’s (4n+2) rule why the protonated product obtained when 4-pyrone reacts with acid is so stable.

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Which carbocation is more stable?

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The question below asks why the products shown are NOT the correct products. I asked this already, and the person explained why those are the correct products, as opposed to what we would think should be the correct products. That's the opposite of what the question was asking. Why are they not the correct products? A reaction mechanism for how we arrive at the correct products is requested ("using key intermediates"). In other words, why is HCl added to the terminal alkene rather than the internal alkene?

Answer 2

Question

Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 15.SE, Problem 42AP

Interpretation Introduction

Interpretation:

4-Pyrone on treatment with acid gets protonated on the carbonyl group oxygen to yield a stable product. Why the structure is so stable is to be explained using resonance structures and the Huckel’s (4n+2) rule.

Concept introduction:

A compound to become aromatic should obey Huckel’s rule. According to Huckel’s rule, any specie that is cyclic, planar and has (4n+2) delocalized Ï€ electrons will be aromatic and stable. Thus species with 2, 6, 10, 14 etc. Ï€ electrons will be aromatic and stable.

To explain:

Using resonance structures and the Huckel’s (4n+2) rule why the protonated product obtained when 4-pyrone reacts with acid is so stable.

Expert Solution & Answer

Trending nowThis is a popular solution!

See solution

Check out sample textbook solution

Answer 3

Question

Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 15.SE, Problem 42AP

Interpretation Introduction

Interpretation:

4-Pyrone on treatment with acid gets protonated on the carbonyl group oxygen to yield a stable product. Why the structure is so stable is to be explained using resonance structures and the Huckel’s (4n+2) rule.

Concept introduction:

A compound to become aromatic should obey Huckel’s rule. According to Huckel’s rule, any specie that is cyclic, planar and has (4n+2) delocalized Ï€ electrons will be aromatic and stable. Thus species with 2, 6, 10, 14 etc. Ï€ electrons will be aromatic and stable.

To explain:

Using resonance structures and the Huckel’s (4n+2) rule why the protonated product obtained when 4-pyrone reacts with acid is so stable.

Expert Solution & Answer

Trending nowThis is a popular solution!

See solution

Check out sample textbook solution

Answer 4

Question

Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 15.SE, Problem 42AP

Interpretation Introduction