Textbook Question
What is the major product of the reaction of 1 mol of propyne with each of the following reagents?
i. sodium amide
7
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Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis
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. 7 - The Reactions of Alkynes • An Introduction to Multistep SynthesisProblem 39j
Bruice 8th EditionCh. 7 - The Reactions of Alkynes • An Introduction to Multistep SynthesisProblem 39jChapter 8, Problem 39j
What is the major product of the reaction of 1 mol of propyne with each of the following reagents?
j. the product of part i followed by 1-chloropropane
Verified step by step guidance1
Step 1: Begin by analyzing the reaction in part i. Propyne (CH≡C-CH₃) reacts with the reagent specified in part i. Determine the product formed in part i before proceeding to part j.
Step 2: Once the product of part i is identified, consider the reaction of this product with 1-chloropropane (CH₃-CH₂-CH₂-Cl). This step involves understanding the type of reaction mechanism that will occur, such as nucleophilic substitution or addition.
Step 3: Identify the functional groups present in the product of part i and in 1-chloropropane. Determine how these groups interact chemically, considering factors like electrophilicity, nucleophilicity, and steric hindrance.
Step 4: Predict the major product of the reaction based on the mechanism. For example, if the reaction involves nucleophilic substitution, identify the leaving group and the nucleophile, and predict the structure of the resulting compound.
Step 5: Verify the stability of the major product formed. Consider factors such as resonance stabilization, steric effects, and electronic effects to confirm that the predicted product is indeed the major product of the reaction.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alkyne Reactivity
Alkynes, such as propyne, are unsaturated hydrocarbons that contain a carbon-carbon triple bond. This triple bond makes them highly reactive, particularly in addition reactions. Understanding how alkynes react with various reagents is crucial for predicting the products of these reactions, including the formation of alkenes or alkanes depending on the conditions and reagents used.
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Alkyne Hydration
Nucleophilic Substitution
Nucleophilic substitution is a fundamental reaction mechanism in organic chemistry where a nucleophile replaces a leaving group in a molecule. In the context of the question, 1-chloropropane can act as a nucleophile, and understanding how it interacts with the product from the first reaction is essential for determining the final product. This concept is key in predicting the outcome of reactions involving alkyl halides.
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01:47Nucleophiles and Electrophiles can react in Substitution Reactions.
Markovnikov's Rule
Markovnikov's Rule states that in the addition of HX to an alkene or alkyne, the hydrogen atom will attach to the carbon with the greater number of hydrogen atoms already attached. This principle helps predict the regioselectivity of reactions involving propyne and other unsaturated hydrocarbons, guiding the formation of major products when reacting with electrophiles or during nucleophilic substitutions.
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Related Practice
Textbook Question
Answer Problem 39, parts a–h, using 2-butyne as the starting material instead of propyne.
a. HBr (1 mol)
b. HBr (2 mol)
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Textbook Question
What is the major product of the reaction of 1 mol of propyne with each of the following reagents?
g. excess H2, Pd/C
h. H2/Lindlar catalyst
1
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Textbook Question
Answer Problem 39 , parts a–h, using 2-butyne as the starting material instead of propyne.
d. Br2 (2 mol)/CH2Cl2
1
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Textbook Question
Answer Problem 39 , parts a–h, using 2-butyne as the starting material instead of propyne.
c. Br2 (1 mol)/CH2Cl2
2
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Textbook Question
What is the major product of the reaction of 1 mol of propyne with each of the following reagents?
e. aqueous H2SO4, HgSO4
f. R2BH in THF followed by H2O2/HO− /H2O