Textbook Question
Draw skeletal structures for each pair of isomers in Problem 7
b.
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Ch. 4 - Isomers: The Arrangement of Atoms in Space
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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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 12
Draw the Z isomer of an alkene that has a CH3 and an H on one sp2 carbon and isopropyl and butyl groups on the other sp2 carbon.
Verified step by step guidance1
Identify the structure of the alkene: The problem specifies that the molecule is an alkene, meaning it contains a carbon-carbon double bond (C=C). Each sp² carbon in the double bond is bonded to two substituents.
Assign the substituents to each sp² carbon: One sp² carbon is bonded to a CH₃ (methyl) group and an H (hydrogen) atom. The other sp² carbon is bonded to an isopropyl group (CH(CH₃)₂) and a butyl group (CH₂CH₂CH₂CH₃).
Understand the Z isomer: The Z (zusammen) isomer of an alkene has the higher-priority substituents on the same side of the double bond. Use the Cahn-Ingold-Prelog priority rules to assign priorities to the substituents on each sp² carbon. Higher atomic number atoms or groups with greater mass take priority.
Assign priorities to the substituents: On the first sp² carbon, CH₃ has a higher priority than H. On the second sp² carbon, the butyl group has a higher priority than the isopropyl group because the butyl group has a longer carbon chain.
Draw the Z isomer: Place the higher-priority groups (CH₃ and butyl) on the same side of the double bond, while the lower-priority groups (H and isopropyl) are on the opposite side. Ensure the double bond is clearly shown, and the spatial arrangement reflects the Z configuration.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Z and E Isomerism
Z and E isomerism refers to the geometric isomerism in alkenes based on the arrangement of substituents around the double bond. In Z isomers, the highest priority substituents on each carbon of the double bond are on the same side, while in E isomers, they are on opposite sides. This distinction is crucial for understanding the spatial orientation of the groups attached to the double bond.
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E/Z Diastereoisomerism
Priority Rules (Cahn-Ingold-Prelog)
The Cahn-Ingold-Prelog priority rules are used to determine the priority of substituents attached to the double-bonded carbons in alkenes. The priority is assigned based on atomic number; the higher the atomic number, the higher the priority. If two substituents have the same atom, the next atoms in the chain are considered until a difference is found, which is essential for correctly identifying Z and E configurations.
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Alkene Structure and Hybridization
Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C=C), characterized by sp2 hybridization of the carbon atoms involved in the double bond. This hybridization leads to a trigonal planar geometry around the sp2 carbons, influencing the physical and chemical properties of the alkene, including its isomerism. Understanding the structure helps in visualizing the spatial arrangement of substituents.
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Related Practice
Textbook Question
Tamoxifen slows the growth of some breast tumors by binding to estrogen receptors. Is tamoxifen an E or a Z isomer?
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Textbook Question
Which of the following objects are chiral?
a. a mug with DAD written to one side of the handle
b. a mug with MOM written to one side of the handle
c. a mug with DAD written opposite the handle
d. a mug with MOM written opposite the handle
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Textbook Question
Tetracycline is called a broad-spectrum antibiotic because it is active against a wide variety of bacteria. How many asymmetric centers does tetracycline have?
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Textbook Question
Which of the following objects are chiral?
e. a wheelbarrow
f. a remote control device
g. a nail
h. screw
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Textbook Question
Assign relative priorities to each set of substituents:
b. -CH2CH2OH, -OH, -CH2Cl, -CH=CH2
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