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Solutions for Carbohydrates and Nucleic Acids
68 continued
(e) base
O O
O
HO
C
H3C CH3
Only the 2'- and 3'-OH groups are close 
enough to form this cyclic acetal (ketal) 
from acetone, called an acetonide.
N
H
HH
OHO
H
CH2 O
N
H
O
NH2
N
N
O
P
O
O
N
NN
N NH2
O
H
OCH2
H
OH OH
H H
O
H
P
O
O
O
P
O
O
O
P
O
O
O
N
N
NH2
OP
O
O
O
O
H
CH2
HH
HOH
H
O
(c)
(b)
(a)
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