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702 Chapter 20
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3.
Which of the following sugars form an optically active aldaric acid?
H HO
H HO
OH H
CH
2
OH
OH H
OH H
H HO
OH H
CH
2
OH
OH H
OH H
OH H
OH H
CH
2
OH
OH H
OH H
H HO
H HO
CH
2
OH
OH H
C
H O
C
H O
C
H O
C
H O
4.
When crystals of d-fructose are dissolved in a basic aqueous solution, two aldohexoses are obtained. Identify
the aldohexoses.
5.
Draw three tetroses that form the same enol.
6.
d-Talose and _______ are reduced to the same alditol.
7.
What is the main structural difference between amylose and cellulose?
8.
What aldohexoses are formed from a Kiliani–Fischer synthesis starting with d-xylose?
9.
What aldohexose is the C-3 epimer of d-glucose?
10.
Draw the most stable chair conformer of
b
-d-allose, a C-3 epimer of
b
-d-glucose.