Textbook Question
Show how you would accomplish the following synthetic transformations. Show all intermediates.
j. trans-hex-2-ene → cis-hex-2-ene
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Ch.9 - Alkynes
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Chapter 9, Problem 36d,e
Predict the products formed when CH3CH2–C≡C:–Na+ reacts with the following compounds.
(d) cyclohexanone
(e) CH3CH2CH2CHO
Verified step by step guidance1
Step 1: Analyze the given reactants. Cyclohexanone is a ketone with a six-membered ring, and CH3CH2CH2CHO is an aldehyde. Both compounds contain carbonyl groups (C=O), which are reactive functional groups in organic chemistry.
Step 2: Determine the type of reaction that might occur. Carbonyl compounds like ketones and aldehydes are often involved in nucleophilic addition reactions, condensation reactions, or oxidation/reduction reactions depending on the reagents and conditions.
Step 3: Consider the reactivity of the carbonyl group. The carbon atom in the carbonyl group is electrophilic due to the polarization of the C=O bond, making it susceptible to attack by nucleophiles. Cyclohexanone and CH3CH2CH2CHO will react differently based on their structural differences (ketone vs. aldehyde).
Step 4: Predict the interaction between the given reactants and the compounds. For cyclohexanone, reactions such as aldol condensation or nucleophilic addition could occur depending on the conditions. For CH3CH2CH2CHO, similar reactions are possible, but aldehydes are generally more reactive than ketones due to less steric hindrance and greater electrophilicity.
Step 5: Write the general mechanism for the reaction. For example, if a nucleophile attacks the carbonyl carbon, the double bond in the C=O group will break, forming a tetrahedral intermediate. Depending on the reaction conditions, this intermediate may lead to the formation of a new product, such as an alcohol or a condensation product.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleophilic Addition
Nucleophilic addition is a fundamental reaction mechanism in organic chemistry where a nucleophile attacks an electrophilic carbon atom, typically found in carbonyl compounds like ketones and aldehydes. This process leads to the formation of a new bond and is crucial for predicting the products of reactions involving compounds such as cyclohexanone and aldehydes.
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Nucleophilic Addition
Carbonyl Compounds
Carbonyl compounds, which include aldehydes and ketones, contain a carbon-oxygen double bond (C=O). Their reactivity is largely due to the polarization of the carbonyl bond, making the carbon atom electrophilic and susceptible to nucleophilic attack. Understanding the structure and reactivity of these compounds is essential for predicting the outcomes of reactions.
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Reaction Mechanisms
Reaction mechanisms describe the step-by-step process by which reactants transform into products. In the context of organic reactions, understanding the mechanism helps in predicting the products formed, including intermediates and transition states. This knowledge is vital for analyzing the reactions of cyclohexanone and other compounds with nucleophiles.
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Related Practice
Textbook Question
Predict the products formed when CH3CH2–C≡C:–Na+ reacts with the following compounds.
a. ethyl bromide
b. tert-butyl bromide
c. formaldehyde
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Textbook Question
Show how you would synthesize the following compounds, starting with acetylene and any compounds containing no more than four carbon atoms.
d. trans-hex-2-ene
e. 1,1-dibromohexane
f. 2,2-dibromohexane
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Textbook Question
Show how you would synthesize the following compounds from acetylene and any other needed reagents:
(a) 6-phenylhex-1-en-4-yne
(b) cis-1-phenylpent-2-ene
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Textbook Question
Show how you would synthesize the following compounds, starting with acetylene and any compounds containing no more than four carbon atoms.
a. hex-1-yne
b. hex-2-yne
c. cis-hex-2-ene
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Textbook Question
Show how you would synthesize the following compounds, starting with acetylene and any compounds containing no more than four carbon atoms.
g. pentanal, CH3CH2CH2CH2CHO
h. pentan-2-one, CH3–CO–CH2CH2CH3
i. (±) 3,4-dibromohexane
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