Textbook Question
Assign the absolute stereochemistry for each of the following molecules drawn in their Fischer projection.
(a)
1
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Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases: Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
Chapter 5, Problem 51e
Assign the absolute stereochemistry for each of the following molecules.
(e) 
Verified step by step guidance1
Step 1: Identify the stereocenter in the molecule. The stereocenter is the carbon atom bonded to four different groups: the amino group (NH₂), the carboxylic acid group (CO₂H), the hydrogen atom (H), and the phenyl group (C₆H₅).
Step 2: Assign priorities to the substituents attached to the stereocenter based on the Cahn-Ingold-Prelog (CIP) priority rules. The priority is determined by atomic number: (1) CO₂H (highest priority due to oxygen), (2) NH₂, (3) C₆H₅, and (4) H (lowest priority).
Step 3: Orient the molecule so that the lowest priority group (H) is pointing away from you. This is typically represented as a dashed wedge in the diagram.
Step 4: Determine the order of the remaining three groups (CO₂H, NH₂, and C₆H₅) as you move clockwise or counterclockwise. Trace the path from the highest priority group (CO₂H) to the second (NH₂) and then to the third (C₆H₅).
Step 5: Assign the absolute configuration based on the direction of the path. If the path is clockwise, the configuration is R. If the path is counterclockwise, the configuration is S.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Stereochemistry
Stereochemistry is the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. It is crucial for understanding isomers, particularly enantiomers, which are non-superimposable mirror images of each other. In organic chemistry, stereochemistry is often denoted using the R/S system, which helps in assigning absolute configurations to chiral centers.
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Chirality
Chirality refers to the property of a molecule that makes it non-superimposable on its mirror image, much like left and right hands. A chiral molecule typically has one or more chiral centers, usually carbon atoms bonded to four different substituents. Identifying chirality is essential for assigning stereochemistry, as it determines the molecule's optical activity and interactions in biological systems.
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Cahn-Ingold-Prelog Priority Rules
The Cahn-Ingold-Prelog (CIP) priority rules are a set of guidelines used to assign priorities to substituents attached to a chiral center based on atomic number and connectivity. The highest priority is given to the atom with the highest atomic number directly attached to the chiral center. These rules are fundamental for determining the R or S configuration of chiral molecules, which is necessary for accurately describing their stereochemistry.
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01:48Why stereoisomers need their own naming system.
Related Practice
Textbook Question
Assign the absolute stereochemistry for each of the following molecules drawn in their Fischer projection.
(d)
1
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Textbook Question
Define the relationship between each set of two molecules as chain isomers, positional isomers, functional group isomers, enantiomers, diastereomers, conformational isomers, or identical
(h)
Textbook Question
Complete the structure of each of these so that it matches the (R) or (S) configuration associated with the name.
(d)
Textbook Question
Complete the structure of each of these so that it matches the (R) or (S) configuration associated with the name.
(a)
5
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Textbook Question
Assign the absolute stereochemistry for each of the following molecules.
(f)
2
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