Heating D-altrose with dilute acid produces a nonreducing anhydro sugar (C6H1005). Methylation of the anhydro sugar followed by acid hydrolysis yields 2,3,4-tri-O-methyl-D-altrose. The formation of the anhydro sugar takes place through a chair conformation of ẞ- D-altropyranose in which the -CH2OH group is axial. What is the structure of the anhydro sugar? CH3 OH HO OH I H₂C CH3 0. 0 H H H H HO OH OH I CH3 H₂C H H H H CH₂ -OH OH HO eTextbook and Media Explain how is it formed. The anhydro sugar is formed when the axial -CH2OH group reacts with C to form a cyclic SUPF Because the anhydro sugar is (i.e., an internal glycoside), it is a sugar. Methylation followed by acid hydrolysis converts the anhydro sugar to 2,3,4-tri-O-methyl-D-altrose.

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Heating D-altrose with dilute acid produces a nonreducing anhydro sugar (C6H1005). Methylation of the anhydro sugar followed by
acid hydrolysis yields 2,3,4-tri-O-methyl-D-altrose. The formation of the anhydro sugar takes place through a chair conformation of ẞ-
D-altropyranose in which the -CH2OH group is axial.
What is the structure of the anhydro sugar?
CH3
OH
HO
OH
I
H₂C
CH3
0.
0
H
H
H
H
HO
OH
OH
I
CH3
H₂C
H
H
H
H
CH₂
-OH
OH
HO
eTextbook and Media
Explain how is it formed.
The anhydro sugar is formed when the axial -CH2OH group reacts with C
to form a cyclic
SUPF
Because the anhydro sugar is
(i.e., an internal glycoside), it is a
sugar.
Methylation followed by acid hydrolysis converts the anhydro sugar to 2,3,4-tri-O-methyl-D-altrose.
Transcribed Image Text:Heating D-altrose with dilute acid produces a nonreducing anhydro sugar (C6H1005). Methylation of the anhydro sugar followed by acid hydrolysis yields 2,3,4-tri-O-methyl-D-altrose. The formation of the anhydro sugar takes place through a chair conformation of ẞ- D-altropyranose in which the -CH2OH group is axial. What is the structure of the anhydro sugar? CH3 OH HO OH I H₂C CH3 0. 0 H H H H HO OH OH I CH3 H₂C H H H H CH₂ -OH OH HO eTextbook and Media Explain how is it formed. The anhydro sugar is formed when the axial -CH2OH group reacts with C to form a cyclic SUPF Because the anhydro sugar is (i.e., an internal glycoside), it is a sugar. Methylation followed by acid hydrolysis converts the anhydro sugar to 2,3,4-tri-O-methyl-D-altrose.
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