Textbook Question
Convert the perspective formula to a skeletal structure.
1
views
Ch. 4 - Isomers: The Arrangement of Atoms in Space
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
Not the one you use?Change textbookSelect a different textbook
Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
Chapter 5, Problem 63
Explain why compound A has two stereoisomers but compounds B and C exist as single compounds.
Verified step by step guidance1
Step 1: Analyze the structures of compounds A, B, and C. Compound A has a positively charged nitrogen atom bonded to four different groups: a methyl group, a hydrogen atom, an ethyl group, and a carbonyl group. This makes the nitrogen atom a stereogenic center, allowing for two stereoisomers (R and S configurations).
Step 2: Examine compound B. The nitrogen atom in compound B is also positively charged and bonded to four different groups: a methyl group, a hydrogen atom, another methyl group, and a carbonyl group. However, two of the groups are identical (methyl groups), which means the nitrogen atom is not a stereogenic center, and compound B exists as a single compound.
Step 3: Evaluate compound C. The nitrogen atom in compound C is neutral and has a lone pair of electrons. It is bonded to three groups: a methyl group, a hydrogen atom, and a carbonyl group. Since the nitrogen atom is sp2 hybridized and planar, it does not have a stereogenic center, and compound C exists as a single compound.
Step 4: Understand the concept of stereoisomers. Stereoisomers arise when a molecule has a stereogenic center (a carbon or nitrogen atom bonded to four different groups) and can exist in two non-superimposable mirror image forms. Compound A meets this criterion, while compounds B and C do not.
Step 5: Summarize the reasoning. Compound A has two stereoisomers due to the presence of a stereogenic nitrogen atom bonded to four different groups. Compound B lacks stereoisomers because it has two identical groups bonded to the nitrogen atom, and compound C lacks stereoisomers because its nitrogen atom is planar and not stereogenic.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
8mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Stereoisomerism
Stereoisomerism occurs when compounds have the same molecular formula and connectivity of atoms but differ in the spatial arrangement of their atoms. This can lead to different physical and chemical properties. Compounds A has two stereoisomers due to the presence of a chiral center, which allows for non-superimposable mirror images.
Recommended video:
Guided course
01:58
Determining when molecules are stereoisomers.
Chirality
Chirality is a property of a molecule that makes it non-superimposable on its mirror image, often due to the presence of a carbon atom bonded to four different substituents. In compound A, the nitrogen atom creates a chiral center, leading to two distinct stereoisomers. In contrast, compounds B and C lack such chiral centers, resulting in only one form.
Recommended video:
Guided course
05:10What is chirality?
Geometric Isomerism
Geometric isomerism, a subtype of stereoisomerism, arises from the restricted rotation around a double bond or a ring structure, leading to different spatial arrangements of substituents. Compounds B and C may have double bonds or cyclic structures that do not allow for geometric isomerism, thus existing as single compounds without stereoisomers.
Recommended video:
Guided course
06:47Monosaccharides - D and L Isomerism
Related Practice
Textbook Question
Disregarding stereoisomers, draw the structures of all alkenes with molecular formula C5H10. Which ones can exist as cis–trans isomers?
1
views
Textbook Question
Limonene exists as two different stereoisomers. The R enantiomer is found in oranges and lemons, and the S enantiomer is found in spruce trees. Which of the following is found in oranges and lemons?
1
views
Textbook Question
Convert the Fischer projection to a perspective formula.
Textbook Question
Draw all possible stereoisomers for each of the following. Indicate those compounds for which no stereoisomers are possible.
a. 1-bromo-2-chlorocyclohexane
b. 2-bromo-4-methylpentane
1
views
Textbook Question
Threonine, an amino acid, has four stereoisomers. The stereoisomer found in nature is (2S,3R)-threonine. Which of the following structures represents the naturally occurring amino acid?
7
views