Textbook Question
Show how you would use the Robinson annulation to synthesize the following compounds.
(a)
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Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds
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
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Wade 9th EditionCh. 22 - Condensations and Alpha Substitutions of Carbonyl CompoundsProblem 66a
Wade 9th EditionCh. 22 - Condensations and Alpha Substitutions of Carbonyl CompoundsProblem 66aChapter 22, Problem 66a
Rank these compounds in order of increasing acid strength.
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Step 1: Analyze the molecular structures of the compounds (A, B, C, and D). Note the presence of functional groups, electronegative atoms, and resonance effects that influence acidity.
Step 2: Consider the inductive effect. Compound B contains trifluoromethyl groups (-CF3), which are highly electronegative and withdraw electron density through the inductive effect, stabilizing the conjugate base and increasing acidity.
Step 3: Evaluate resonance effects. Compound C and D have additional carbonyl groups that can participate in resonance stabilization of the conjugate base, making them more acidic than compound A.
Step 4: Compare compound A and C. Compound C has an extra carbonyl group compared to A, which increases its ability to stabilize the conjugate base through resonance, making it more acidic than A.
Step 5: Rank the compounds in order of increasing acid strength based on the combined effects of resonance and inductive stabilization: A < C < D < B.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acid Strength
Acid strength refers to the ability of a compound to donate protons (H+) in a solution. Stronger acids dissociate more completely in water, resulting in a higher concentration of H+ ions. Factors influencing acid strength include the stability of the conjugate base, electronegativity of atoms, and resonance stabilization. Understanding these factors is crucial for ranking acids.
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The 3 factors that determine the strength of inductive effects.
Conjugate Base Stability
The stability of a conjugate base is a key determinant of acid strength. A more stable conjugate base corresponds to a stronger acid, as it can better accommodate the negative charge after proton donation. Factors such as electronegativity, size of the atom bearing the charge, and resonance can enhance conjugate base stability, thus influencing the acid's strength.
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Resonance Effects
Resonance effects occur when a molecule can be represented by multiple valid Lewis structures, leading to delocalization of electrons. In the context of acids, resonance can stabilize the conjugate base by spreading out the negative charge over multiple atoms. This increased stability often results in a stronger acid, making resonance a critical concept in acid strength comparisons.
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Related Practice
Textbook Question
Propose mechanisms for the reactions shown in Problems 22-63 part (a).
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Textbook Question
Propose mechanisms for the reactions shown in Problems 22-63 part (b).
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Textbook Question
Pentane-2,4-dione (acetylacetone) exists as a tautomeric mixture of 8% keto and 92% enol forms. Draw the stable enol tautomer, and explain its unusual stability.
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Textbook Question
Rank these compounds in order of increasing enol content. In each case, draw the most stable enol.
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Textbook Question
Show how you would use the Robinson annulation to synthesize the following compounds.
(b)
1
views