Textbook Question
Propose a mechanism for each of the following reactions:
a.
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Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives
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. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblem 86a
Bruice 8th EditionCh. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblem 86aChapter 17, Problem 86a
In an aqueous solution, D-glucose exists in equilibrium with two six-membered ring compounds. Draw the structures of these compounds.
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Understand that D-glucose is an aldohexose, meaning it contains an aldehyde group and six carbon atoms. In aqueous solution, it undergoes intramolecular cyclization to form cyclic hemiacetals.
Recognize that the cyclization occurs when the hydroxyl group on carbon-5 (C-5) reacts with the aldehyde group on carbon-1 (C-1), forming a six-membered ring structure called a pyranose.
Identify that the cyclization creates a new stereocenter at C-1, known as the anomeric carbon. This results in two possible stereoisomers: the alpha (α) anomer and the beta (β) anomer.
Draw the structure of the α-D-glucopyranose, where the hydroxyl group attached to the anomeric carbon (C-1) is positioned *axially* (down) relative to the ring plane.
Draw the structure of the β-D-glucopyranose, where the hydroxyl group attached to the anomeric carbon (C-1) is positioned *equatorially* (up) relative to the ring plane.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Anomeric Carbon
The anomeric carbon is the carbon atom in a sugar molecule that is derived from the carbonyl carbon of the open-chain form. In cyclic forms of sugars, it is the carbon that determines the alpha or beta configuration, depending on whether the hydroxyl group is positioned below or above the plane of the ring. Understanding this concept is crucial for drawing the correct structures of d-glucose's cyclic forms.
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Carbonation of Grignard Reagents
Haworth Projection
The Haworth projection is a common way to represent the cyclic forms of sugars, showing the ring structure in a two-dimensional format. It illustrates the orientation of substituents around the ring, making it easier to visualize the stereochemistry of the molecule. This representation is essential for accurately drawing the six-membered ring compounds of d-glucose.
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Mutarotation
Mutarotation is the process by which the optical rotation of a sugar solution changes over time as the sugar equilibrates between its anomeric forms. For d-glucose, this involves the interconversion between alpha and beta anomers in solution. Understanding mutarotation is important for recognizing the dynamic nature of sugar structures in aqueous environments.
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Related Practice
Textbook Question
In the presence of an acid catalyst, acetaldehyde forms a trimer known as paraldehyde. Because it induces sleep when it is administered to animals in large doses, paraldehyde is used as a sedative or hypnotic. Propose a mechanism for the formation of paraldehyde.
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Textbook Question
How can the following compounds be prepared from the given starting materials?
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Textbook Question
Shown below is the 1H NMR spectrum of the alkyl bromide used to make the phosphonium ylide that reacts with a ketone in a Wittig reaction to form a compound with molecular formula C11H14. What product is obtained from the Wittig reaction?
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Textbook Question
What carbonyl compound and what phosphonium ylide are needed to synthesize the following compounds?
b.
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Textbook Question
Propose a mechanism for each of the following reactions:
b.
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