Pearson eText for Essential Organic Chemistry -- Instant Access (Pearson+)
Pearson eText for Essential Organic Chemistry -- Instant Access (Pearson+)
3rd Edition
ISBN: 9780137533268
Author: Paula Bruice
Publisher: PEARSON+
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Chapter 16, Problem 40P
Interpretation Introduction

Interpretation:

Whether Daltrose exists preferentially as a pyranose or furanose has to be predicted.

Concept Introduction:

Carbohydrates are made from carbon, oxygen and hydrogen atoms and the wide numbers of isomers exist for the carbohydrates because of the presence of chiral Carbon atoms.

Pyranose are the compounds that comprise six-membered ring made of one Oxygen and five Carbon atoms, whereas furanose is the carbohydrates that comprise five-membered ring made of one Oxygen and four carbon atoms.

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4) Structure: the appropriate box. CHO -OH H- HO- -H HO -H Write the requested cyclized form of the given carbohydrates in B-pyranose a-furanose CH₂OH
The most stable conformation of the pyranose ring of most D-aldohexoses places the largest group, CH2OH, in the equatorial position. An exception to this is the aldohexose D-idose. Draw the two possible chair conformations of either the a or ß anomer of D-idose. Explain why the more stable conformation has the CH2OH group in the axial position.
Xylulose has the following structural formula. To what carbohydrate class does xylulose belong based on the number of carbons and carbonyl functionality?   A) aldotetrose B) aldopentose C) ketotetrose D) ketopentose E) ketohexose
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