Textbook Question
What is the major product(s) of each of the following reactions?
a.
b.
2
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Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds
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
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Bruice 8th EditionCh. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblem 63d
Bruice 8th EditionCh. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblem 63dChapter 11, Problem 63d
What is the major product(s) of each of the following reactions?
d. 
Verified step by step guidance1
Step 1: Analyze the given reaction conditions. The presence of H2SO4 (sulfuric acid) and heat (Δ) suggests an acid-catalyzed dehydration reaction. This type of reaction typically involves the removal of a water molecule from an alcohol to form an alkene.
Step 2: Identify the alcohol group (-OH) in the given molecule. The hydroxyl group is attached to a tertiary carbon, which is highly favorable for dehydration due to the stability of the resulting carbocation intermediate.
Step 3: Predict the mechanism. The reaction proceeds via an E1 (unimolecular elimination) mechanism. First, the hydroxyl group is protonated by H2SO4, converting it into a better leaving group (water). This step leads to the formation of a tertiary carbocation.
Step 4: Consider carbocation rearrangement. Since the carbocation is already tertiary, no rearrangement is necessary. The next step involves elimination of a proton from a β-hydrogen (hydrogen on a carbon adjacent to the carbocation) to form the most stable alkene.
Step 5: Determine the major product. The major product will be the most substituted alkene, as it is more stable due to hyperconjugation and alkene stability rules (Zaitsev's rule). Analyze the structure to identify the β-hydrogens and predict the location of the double bond in the final product.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Dehydration Reaction
A dehydration reaction involves the removal of a water molecule from a compound, typically resulting in the formation of a double bond. In organic chemistry, this process often occurs with alcohols in the presence of an acid catalyst, leading to the formation of alkenes. The reaction is crucial for synthesizing more complex molecules and understanding reaction mechanisms.
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General Reaction of Dehydration with POCl3
Acid Catalysis
Acid catalysis involves the use of an acid to increase the rate of a chemical reaction. In the context of dehydration reactions, sulfuric acid (H2SO4) serves as a catalyst that protonates the alcohol, making it a better leaving group. This step is essential for facilitating the elimination of water and promoting the formation of the alkene product.
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Markovnikov's Rule
Markovnikov's Rule states that in the addition of HX to an alkene, the hydrogen atom will attach to the carbon with the greater number of hydrogen atoms already attached. This principle is important in predicting the major product of reactions involving alkenes, particularly when considering regioselectivity in dehydration reactions where carbocation stability plays a key role.
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Related Practice
Textbook Question
What is the major product(s) of each of the following reactions?
h.
1
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Textbook Question
In Section 10.12, we saw that S-adenosylmethionine (SAM) methylates the nitrogen atom of noradrenaline to form adrenaline, a more potent hormone. If SAM methylates an OH group attached to the benzene ring instead, it completely destroys noradrenaline's activity.
b. Which reaction is more apt to occur, methylation on nitrogen or methylation on oxygen?
1
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Textbook Question
What alkenes would you expect to be obtained from the acid-catalyzed dehydration of 1-hexanol?
1
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Textbook Question
What is the major product(s) of each of the following reactions?
g.
Textbook Question
What is the major product(s) of each of the following reactions?
c.
1
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