Textbook Question
Why does cis-2-butene have a higher boiling point than trans-2-butene?
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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 13b
Bruice 8th EditionCh. 7 - The Reactions of Alkynes • An Introduction to Multistep SynthesisProblem 13bChapter 8, Problem 13b
Drawing on what you know about the stereochemistry of alkene addition reactions,
b. predict the configuration of the product of the reaction.
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Analyze the type of alkene addition reaction involved (e.g., hydrohalogenation, halogenation, hydration, etc.) and determine whether the reaction proceeds via a syn-addition, anti-addition, or a combination of both. This will help predict the stereochemical outcome.
Identify the reagents and reaction conditions provided in the problem. For example, if the reaction involves Br2 in an inert solvent like CCl4, it typically proceeds via anti-addition, forming a trans product.
Draw the starting alkene structure and consider its geometry (e.g., cis or trans configuration). This will influence the stereochemistry of the product.
Apply the stereochemical rules for the specific reaction mechanism. For example, in anti-addition, the two new substituents will add to opposite faces of the double bond, while in syn-addition, they will add to the same face.
Draw the product(s) of the reaction, ensuring that the stereochemistry is clearly indicated (e.g., using wedge and dash bonds to show 3D configuration). If the reaction produces enantiomers or diastereomers, include all possible stereoisomers.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Stereochemistry
Stereochemistry is the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the context of alkene addition reactions, it is crucial to understand how the orientation of substituents around the double bond influences the configuration of the product, whether it be cis or trans.
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Alkene Addition Reactions
Alkene addition reactions involve the addition of reagents across the carbon-carbon double bond of alkenes, resulting in the formation of saturated compounds. The mechanism of these reactions can lead to different stereochemical outcomes, depending on the nature of the reagents and the conditions under which the reaction occurs.
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Regioselectivity and Stereoselectivity
Regioselectivity refers to the preference of a chemical reaction to yield one structural isomer over others, while stereoselectivity indicates the preference for one stereoisomer over another. In alkene addition reactions, understanding these concepts helps predict the configuration of the product, as certain pathways may favor the formation of specific stereoisomers based on the reaction conditions.
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Related Practice
Textbook Question
What ketones are formed from the acid-catalyzed hydration of 3-heptyne?
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Textbook Question
Drawing on what you know about the stereochemistry of alkene addition reactions,
a. write the mechanism for the reaction of 2-butyne with one equivalent of Br2.
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Textbook Question
In Table 7.2, what is the smallest alkane, the smallest terminal alkene, and the smallest terminal alkyne that are liquids at room temperature, which is generally taken to be 20 °C to 25 °C?
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Textbook Question
Which alkyne should be used for the synthesis of each of the following ketones?
a.
b.
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Textbook Question
Which alkyne should be used for the synthesis of each of the following ketones?
c.
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