Textbook Question
Because of the angle strain present in cyclopropanes, they tend to open up in the presence of nearby radicals. Show a mechanism for the following reaction that demonstrates this principle.
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Ch. 8 - Alkenes I: Properties and Electrophilic Additions
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
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Mullins 1st EditionCh. 8 - Alkenes I: Properties and Electrophilic AdditionsProblem 66c
Mullins 1st EditionCh. 8 - Alkenes I: Properties and Electrophilic AdditionsProblem 66cChapter 7, Problem 66c
How many stereoisomers are possible for the following alkenes?
(c) 
Verified step by step guidance1
Step 1: Identify the stereogenic centers in the molecule. A stereogenic center is an atom (usually carbon) bonded to four different groups. In the given structure, the carbon attached to the hydroxyl group (-OH) is a stereogenic center because it is bonded to four distinct groups.
Step 2: Determine the number of double bonds in the molecule that can exhibit cis-trans (E/Z) isomerism. Double bonds can show stereoisomerism if each carbon in the double bond is attached to two different groups. In the given structure, there are two double bonds that can exhibit E/Z isomerism.
Step 3: Calculate the total number of stereoisomers using the formula: Total stereoisomers = 2^n, where n is the number of stereogenic centers and stereoisomeric double bonds. In this case, there is 1 stereogenic center and 2 stereoisomeric double bonds, so n = 3.
Step 4: Apply the formula to calculate the total number of stereoisomers. Since n = 3, the total number of stereoisomers is 2^3 = 8.
Step 5: Verify the structure to ensure no additional stereogenic centers or stereoisomeric double bonds are overlooked. Confirm that the molecule has 1 stereogenic center and 2 stereoisomeric double bonds, leading to 8 possible stereoisomers.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Stereoisomerism
Stereoisomerism refers to the phenomenon where 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. In alkenes, stereoisomers arise due to the restricted rotation around the double bond, resulting in cis and trans configurations.
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Chirality
Chirality is a property of a molecule that makes it non-superimposable on its mirror image, often due to the presence of a chiral center, typically a carbon atom bonded to four different substituents. In the context of alkenes, if a double bond is attached to two different groups on each carbon, it can lead to the formation of enantiomers, which are a type of stereoisomer.
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Counting Stereoisomers
The number of possible stereoisomers for a compound can be determined using the formula 2^n, where n is the number of chiral centers in the molecule. Additionally, for alkenes with restricted rotation, the presence of different substituents on the double bond can also contribute to the total count of stereoisomers, including both geometric (cis/trans) and optical isomers.
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Related Practice
Textbook Question
How many stereoisomers are possible for the following alkenes?
(b)
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Textbook Question
Cyclooctene is one of the smaller rings that can form a trans alkene. Would you expect cis-cyclooctene or trans-cyclooctene to react more quickly in an acid-catalyzed hydration reaction?
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Textbook Question
Which of the following cycloalkanes would you expect to produce the least heat upon combustion when measured per CH2? Explain your answer.
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Textbook Question
How many stereoisomers are possible for the following alkenes?
(d)
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Textbook Question
When using sulfuric acid, but in the absence of other nucleophiles like water or bromide ion, less stable alkenes can be isomerized to their more stable isomer. Provide a mechanism for these acid-catalyzed isomerization reactions. [This is one illustration of the principle of microscopic reversibility.]
(a)
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