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Chapter 20 677
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7.
d-psicose
8.
a.
A ketoheptose has four asymmetric centers
1
2
4
=
16 stereoisomers
2
.
b.
An aldoheptose has five asymmetric centers
1
2
5
=
32 stereoisomers
2
.
c.
A ketotriose does not have an asymmetric center; therefore, it has no stereoisomers.
9.
CH
2
OH
C O
HO H
H OH
H OH
CH
2
OH
D
-fructose
HO
−
CH
2
OH
C O
C HO
H OH
H OH
CH
2
OH
H
2
O
an enolate ion
−
H OH
CH
2
OH
C OH
CO
H OH
H OH
CH
2
OH
an enediol
H
H OH
H OH
CH
2
OH
HO
−
CH
2
OH
CHOH
CO
H OH
H OH
CH
2
OH
HO
−
−
CH
2
OH H HO
C OH
CO