*IMPORTANT NOTE: The most common ketoses have the ket function at carbon 2. 5. Circle the carbonyl group in the structures below and specif structures correspond to an aldose or ketoses. CH₂OH C=O CH₂OH Н_ C H-C-OH CH₂OH

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Chapter1: Chemical Foundations
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*IMPORTANT NOTE: The most common ketoses have the ketone
function at carbon 2.
5. Circle the carbonyl group in the structures below and specify if the
structures correspond to an aldose or ketoses.
O
CH₂OH
C=O
CH₂OH
H
C
H-C-OH
CH₂OH
6. The sugar below is glucose. Number the carbons starting with the
carbonyl group. Determine how many carbons are chiral centers
(circle the chiral centers and list them in the space below).
H-C-OH
HO-C-H
H-C-OH
H-C-OH
CH₂OH
D-Glucose,
an aldohexose
H-C-OH
C-0
HO-C-H
H-C-OH
H-C-OH
CH₂OH
D-Fructose,
a ketohexose
Chiral centers:
7. Based on your answer above, calculate the number of possible
stereosiomers that glucose has. Remember, the equation to do that is
2" where n is the number of chiral centers and two is the number of
configurations (E.g. D and L are two configurations).
CHO
H-C-OH
Achiral centers:
8. The molecules below (fisher projections) correspond to
glyceraldehyde. Glyceraldehyde has two configurations D and L. The
configuration is determined based on the position of the -OH group.
D configuration for dextro (right) and L for levo (left). Determine the
configuration of each of the two molecules below.
CHO
но-с-
CH₂OH
D-Glyceraldehyde
H
CH₂OH
L-Glyceraldehyde
Fischer projection formulas
Transcribed Image Text:*IMPORTANT NOTE: The most common ketoses have the ketone function at carbon 2. 5. Circle the carbonyl group in the structures below and specify if the structures correspond to an aldose or ketoses. O CH₂OH C=O CH₂OH H C H-C-OH CH₂OH 6. The sugar below is glucose. Number the carbons starting with the carbonyl group. Determine how many carbons are chiral centers (circle the chiral centers and list them in the space below). H-C-OH HO-C-H H-C-OH H-C-OH CH₂OH D-Glucose, an aldohexose H-C-OH C-0 HO-C-H H-C-OH H-C-OH CH₂OH D-Fructose, a ketohexose Chiral centers: 7. Based on your answer above, calculate the number of possible stereosiomers that glucose has. Remember, the equation to do that is 2" where n is the number of chiral centers and two is the number of configurations (E.g. D and L are two configurations). CHO H-C-OH Achiral centers: 8. The molecules below (fisher projections) correspond to glyceraldehyde. Glyceraldehyde has two configurations D and L. The configuration is determined based on the position of the -OH group. D configuration for dextro (right) and L for levo (left). Determine the configuration of each of the two molecules below. CHO но-с- CH₂OH D-Glyceraldehyde H CH₂OH L-Glyceraldehyde Fischer projection formulas
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