Textbook Question
Draw the products formed when β-D-galactose reacts with ethanol and HCl. (Show all structures as chair conformers.)
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Ch. 20 - The Organic Chemistry of Carbohydrates
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
Chapter 21, Problem 28a
Name the following compounds and indicate whether or not each is a reducing sugar:
a. 
Verified step by step guidance1
Step 1: Identify the functional groups in each compound. Look for key features such as aldehydes, ketones, hydroxyl groups, or hemiacetals, as these are important for determining whether the compound is a reducing sugar.
Step 2: Determine if the compound contains a free anomeric carbon. A reducing sugar must have a free anomeric carbon that can open to form an aldehyde or ketone group in solution.
Step 3: Assign the correct name to each compound based on IUPAC nomenclature rules. For carbohydrates, consider the number of carbons (e.g., triose, tetrose, pentose, hexose) and whether the sugar is an aldose or ketose.
Step 4: Check for any modifications to the sugar, such as glycosidic linkages, which may prevent the compound from being a reducing sugar. If the anomeric carbon is involved in a glycosidic bond, the sugar is non-reducing.
Step 5: Conclude whether each compound is a reducing sugar or not, based on the presence of a free anomeric carbon and its ability to reduce oxidizing agents like Benedict's or Fehling's solution.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Reducing Sugars
Reducing sugars are carbohydrates that can donate electrons to other molecules, typically due to the presence of a free aldehyde or ketone group. This property allows them to reduce certain chemical reagents, such as Benedict's or Fehling's solutions, which is a key characteristic in identifying them. Common examples include glucose and fructose, which can participate in redox reactions.
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Reducing Sugars
Nomenclature of Organic Compounds
Nomenclature in organic chemistry refers to the systematic naming of chemical compounds based on established rules, such as those set by the International Union of Pure and Applied Chemistry (IUPAC). Understanding the structure of a compound, including functional groups and carbon chain length, is essential for accurately naming it. This knowledge is crucial for communicating chemical information clearly.
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01:40Defining meso compounds.
Structural Isomers
Structural isomers are compounds that share the same molecular formula but differ in the arrangement of atoms within the molecule. This variation can lead to different chemical properties and reactivity, including whether a sugar is reducing or non-reducing. Recognizing structural isomers is important for understanding the diversity of organic compounds and their functions.
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01:10What is a constitutional isomer?
Related Practice
Textbook Question
Name the following compounds and indicate whether or not each is a reducing sugar:
b.
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Textbook Question
Name the following compounds and indicate whether or not each is a reducing sugar:
c.
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Textbook Question
Why is only a trace amount of acid used in the formation of an N-glycoside?
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Textbook Question
What is the specific rotation of an equilibrium mixture of fructose? (Hint: Recall that the specific rotation of an equilibrium mixture of glucose is +52.7.)
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Textbook Question
Which OH groups are in the axial position in each of the following?
a. β-D-idopyranose
b. α-D-allopyranose