Domanda del libro di testo
Draw the structure that completes the mutarotation reaction between the two cyclic forms of (a) galactose and (b) fructose.
b.
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Ch.20 Carbohydrates
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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TOC.tableOfContents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 20, Problema 8
The cyclic structure of D-idose, an aldohexose, is shown in the margin. Convert this to the straight-chain Fischer projection structure.
Guida verificata passo dopo passo1
Identify the cyclic structure as a pyranose (six-membered ring) or furanose (five-membered ring). For d-idose, it is typically a pyranose structure.
Determine the configuration of the anomeric carbon (C-1) in the cyclic structure. If the hydroxyl group (-OH) on C-1 is pointing down, it is the alpha-anomer; if it is pointing up, it is the beta-anomer.
Examine the positions of the hydroxyl groups (-OH) on the remaining carbons (C-2 to C-5) in the cyclic structure. Note whether each -OH group is pointing up or down relative to the ring plane.
Translate the positions of the -OH groups from the cyclic structure to the straight-chain Fischer projection. In the Fischer projection, groups pointing down in the cyclic structure correspond to groups on the right side of the Fischer projection, and groups pointing up correspond to groups on the left side.
Draw the Fischer projection for d-idose, ensuring that the aldehyde group (-CHO) is at the top (C-1) and the hydroxymethyl group (-CH2OH) is at the bottom (C-6). Place the -OH groups on the appropriate sides based on the configuration determined in the previous step.
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Cyclic and Straight-Chain Forms of Sugars
Sugars can exist in cyclic and straight-chain forms. In aqueous solutions, many monosaccharides, like d-idose, predominantly adopt a cyclic structure due to the reaction between the carbonyl group and a hydroxyl group. The straight-chain form, known as the Fischer projection, represents the sugar in its open-chain state, which is essential for understanding its reactivity and properties.
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Percorso guidato
2:55
Cyclic Hemiacetals Concept 2
Fischer Projection
The Fischer projection is a two-dimensional representation of a molecule, particularly useful for depicting carbohydrates. In this format, the most oxidized carbon is placed at the top, and the horizontal lines represent bonds that project out of the plane towards the viewer, while vertical lines represent bonds going behind the plane. This method helps visualize the stereochemistry of sugars and their functional groups.
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0:48Fischer Projections Example 1
Aldoses and Ketoses
Aldoses and ketoses are two classes of monosaccharides distinguished by the position of their carbonyl group. Aldoses, like d-idose, have an aldehyde group at one end, while ketoses have a ketone group typically at the second carbon. Understanding this distinction is crucial for converting between cyclic and straight-chain forms, as it influences the structure and reactivity of the sugar.
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1:03Ketoses as Reducing Sugars Concept 2
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Draw the structure that completes the mutarotation reaction between the two cyclic forms of (a) galactose and (b) fructose.
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