Organic Chemistry
Organic Chemistry
8th Edition
ISBN: 9781305580350
Author: William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher: Cengage Learning
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Chapter 25.3, Problem AQ
Interpretation Introduction

Interpretation:

The stereochemical descriptions for mannose and fucose from the scheme has to be chosen.

Concept Introduction:

The stereochemical descriptors are D-form and L-form. In D-form, the –OH group in the penultimate carbon is at right side of the carbon.  In L-form, the –OH group is located at the left side of the penultimate carbon.

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What are the stereochemical descriptors for mannose and fucose in the above scheme? 1. Both are d-sugars. 2. Both are l-sugars. 3. Mannose is d and fucose is l. 4. Mannose is l and fucose is d.
How many stereoisomers are possible for a. a ketoheptose? b. an aldoheptose? c. a ketotriose?
1. L-aspartic acid + phosgene (COCl2)= ? 2.Draw the (S)-enantiomer of two sweeteners intermediate 4 + intermediate 5 = two sweeteners intermediate 6.  (Intermediate 4 is the image provided)+  (Intermediate 5 is the product of number 1)= Intermediate 6
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