Problem 23 Propose structures that meet the... [FREE SOLUTION]

Chapter 3: Problem 23

Propose structures that meet the following descriptions: (a) A ketone with five carbons (b) A four-carbon amide (c) A five-carbon ester (d) An aromatic aldehyde (e) A keto ester (f) An amino alcohol

Short Answer

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(a) 2-Pentanone, (b) Butanamide, (c) Ethyl propanoate, (d) Benzaldehyde, (e) Ethyl acetoacetate, (f) Ethanolamine.

Step by step solution

Understanding the Problem

We need to propose chemical structures that match specific functional group descriptions: a ketone, an amide, an ester, an aromatic aldehyde, a keto ester, and an amino alcohol.

Propose a Ketone with Five Carbons

A ketone has a carbonyl group (C=O) bonded to two alkyl groups. For a five-carbon ketone, consider 2-pentanone (also known as methyl propyl ketone), with the structure CH3-CH2-CH2-C(=O)-CH3.

Propose a Four-Carbon Amide

An amide contains a carbonyl group attached to a nitrogen. A simple four-carbon amide is butanamide, with the structure CH3-CH2-CH2-C(=O)-NH2.

Propose a Five-Carbon Ester

An ester has a carbonyl group connected to an oxygen atom bonded to an alkyl group. A five-carbon ester could be ethyl propanoate, with the structure CH3-CH2-C(=O)-O-CH2-CH3.

Propose an Aromatic Aldehyde

An aromatic aldehyde contains an aldehyde group (CHO) attached to an aromatic ring. An example is benzaldehyde, with the structure C6H5-CHO.

Propose a Keto Ester

A keto ester contains both a ketone and an ester group. Ethyl acetoacetate is a simple example, with the structure CH3-C(=O)-CH2-C(=O)-OC2H5.

Propose an Amino Alcohol

An amino alcohol has both an amino group (NH2) and a hydroxyl group (OH). Ethanolamine (2-aminoethanol), CH2-NH2-CH2-OH, is a basic representative of an amino alcohol.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Ketone

A ketone is a type of organic compound characterized by a carbonyl group (C=O) bonded to two carbon atoms. The carbon atoms can either be part of an aliphatic chain or a part of a ring structure. Ketones are highly relevant in both chemistry and biology.

The simplest ketone is acetone, with the formula CH3-CO-CH3.
For an example of a five-carbon ketone, consider 2-pentanone, also known as methyl propyl ketone, with the structure CH3-CH2-CH2-C(=O)-CH3.

Ketones are often found as intermediates in metabolic pathways such as the breakdown of glucose and fatty acids.

Amide

Amides are compounds characterized by a carbonyl group (C=O) directly bonded to a nitrogen atom. They are structurally related to carboxylic acids but with a nitrogen atom replacing the hydroxyl group.

An example of a simple four-carbon amide is butanamide, with the structure CH3-CH2-CH2-C(=O)-NH2.
Amides are present in proteins, serving as the linkages between amino acid residues.

Amides are typically less reactive than esters and acids due to resonance stabilization of the carbonyl group with the lone pair on nitrogen.

Ester

Esters are a diverse group of compounds where a carbonyl group is bonded to an alkoxyl group (O-R). They are commonly found as natural and synthetic compounds.

A five-carbon ester example is ethyl propanoate, with the structure CH3-CH2-C(=O)-O-CH2-CH3.
Esters are key components in the fragrance and flavor industry due to their pleasant smells.

Esters are versatile molecules that can be hydrolyzed back into alcohol and acid, displaying a variety of reactivities based on their substituents.

Aromatic Aldehyde

An aromatic aldehyde is a compound where an aldehyde group (R-CHO) is attached to an aromatic ring. This connection imparts unique chemical and physical properties.

Benzaldehyde is a well-known aromatic aldehyde, with the formula C6H5-CHO.
Benzaldehyde is used in flavorings and perfumes and can be synthesized via the oxidation of toluene.

Aromatic aldehydes tend to be more stable than their aliphatic counterparts due to resonance stabilization provided by the aromatic ring.

Keto Ester

Keto esters are compounds that contain both a ketone and an ester functional group, making them highly functionalized and reactive.

Ethyl acetoacetate is a classic example, with the structure CH3-C(=O)-CH2-C(=O)-OC2H5.
Keto esters are crucial precursors in organic synthesis, often used in the synthesis of enolates and various carbonyl compounds.

This dual functionality can be exploited to perform a variety of chemical transformations, highlighting the compound's versatility in synthetic chemistry.

Amino Alcohol

Amino alcohols contain both an amino group (NH2) and a hydroxyl group (OH) within the same molecule, making them important in a range of biological and synthetic contexts.

Ethanolamine, also known as 2-aminoethanol, with the formula CH2-NH2-CH2-OH, is a primary example.
These compounds find applications in pharmaceuticals, as surfactants, and in the creation of emulsifiers.

Amino alcohols are integral to many physiological processes and are known for their ability to interact with a variety of biological molecules.

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