Textbook Question
Prioritize the substituents at each chiral center and then, by comparing them to the models you created in Section 6.3.2, label the absolute configuration as R or S.
(d)
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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 20a
Order the following sets of substituents via their priority using the CIP rules. (R = position of attachment to the asymmetric center.)
(a) 
Verified step by step guidance1
Step 1: Understand the CIP (Cahn-Ingold-Prelog) priority rules. These rules are used to assign priorities to substituents attached to a chiral center based on atomic number, isotopic mass, and connectivity. The substituent with the highest atomic number directly attached to the chiral center gets the highest priority.
Step 2: Analyze the substituents provided: R-N (amine group), R-OH (hydroxyl group), R-NH2 (amino group), and R-Br (bromo group). Focus on the atom directly attached to the chiral center (R).
Step 3: Compare the atomic numbers of the atoms directly attached to the chiral center: Nitrogen (N, atomic number 7), Oxygen (O, atomic number 8), Bromine (Br, atomic number 35). Bromine has the highest atomic number, followed by Oxygen, then Nitrogen.
Step 4: For substituents with the same atom directly attached (e.g., R-N and R-NH2), consider the connectivity and the number of bonds to other atoms. R-N has a nitrogen atom bonded to two other groups, while R-NH2 has a nitrogen atom bonded to one hydrogen and one group. R-N will have higher priority than R-NH2.
Step 5: Order the substituents based on priority: R-Br > R-OH > R-N > R-NH2. This ranking follows the CIP rules considering atomic number and connectivity.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
CIP Rules
The Cahn-Ingold-Prelog (CIP) rules are a set of guidelines used to assign priority to substituents attached to a chiral center in organic molecules. These rules prioritize substituents based on atomic number, with higher atomic numbers receiving higher priority. If two substituents have the same atom, the priority is determined by the next atoms in the substituent chain, continuing until a difference is found.
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Chirality
Chirality refers to the geometric property of a molecule that makes it non-superimposable on its mirror image, much like left and right hands. Molecules that possess chirality typically have a carbon atom bonded to four different substituents, creating an asymmetric center. Understanding chirality is essential for determining the stereochemistry of compounds and their interactions in biological systems.
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Substituent Priority
Substituent priority is the ranking of different groups attached to a chiral center based on the CIP rules. This ranking is crucial for determining the configuration of the chiral center, which can be designated as either R (rectus) or S (sinister) based on the arrangement of the substituents. Correctly identifying the priority of substituents is vital for accurately describing the stereochemistry of organic compounds.
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Related Practice
Textbook Question
Prioritize the substituents at each chiral center and then, by comparing them to the models you created in Section 6.3.2, label the absolute configuration as R or S.
(a)
Textbook Question
Of the following pairs, identify the higher priority substituent according to the CIP rules. (R = position of attachment to the asymmetric center.)
(a)
Textbook Question
By comparing them to the models you created in Section 6.3.2, label the following chiral centers as R or S.
(j)
Textbook Question
For the compound 1-ethyl-3-isopropylcyclopentane,
(d) LOOKING AHEAD What is the relationship between a cis isomer and a trans isomer?
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Textbook Question
For the compound 1-ethyl-3-isopropylcyclopentane
(c) What is the stereochemical relationship between trans isomers?