CH3 CH3 CH3 go Br H Br rotate H- H. Br 180 H- in H. Br Br Br H- plane [ HELPFUL HINT ] ČH3 Build hand-held models of A and A B and relate them to the Fischer projections shown here. Same structure Not the same (Flipping the projection formula over sideways creates the projection CH3 formula for the H- Br enantiomer of A.) Br- H- CH3 Not the same (Flipping the projection formula over end for end creates the projection formula for the enantiomer of A.) Because Fischer projections must be used with such care, we introduce them now only so that you can understand Fischer projections when you see them in the context of other courses. Our emphasis for most of this book will be on the use of solid and dashed wedges to represent three-dimensional formulas (or chair conformational structures in the case of cyclohexane derivatives), except in Chapter 22 when we will use Fischer projec- tions again in our discussion of carbohydrates. If your instructor wishes to utilize Fischer projections further, you will be so advised. (a) Give the (R,S) designations for each chirality center in compound A and for compound B. (b) Write the Fischer projection formula for a compound C that is the diastereomer of A and B. (c) Would C be optically active? • PRACTICE PROBLEM 5.26

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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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just problem 5.26 please
CH3
ald
CH3
CH3
Br H
Br
rotate
H-
Br
180°
H-
in
H.
Br
Br
Br
H-
plane
[ HELPFUL HINT ]
CH3
Build hand-held models of A and
A
B and relate them to the Fischer
projections shown here.
Same structure
Not the same
(Flipping the projection
formula over sideways
creates the projection
CH3
formula for the
H-
Br
enantiomer of A.)
Br-
H-
Not the same
(Flipping the projection
formula over end for end
creates the projection formula
for the enantiomer of A.)
Because Fischer projections must be used with such care, we introduce them now
only so that you can understand Fischer projections when you see them in the context of
other courses. Our emphasis for most of this book will be on the use of solid and dashed
wedges to represent three-dimensional formulas (or chair conformational structures in the
case of cyclohexane derivatives), except in Chapter 22 when we will use Fischer projec-
tions again in our discussion of carbohydrates. If your instructor wishes to utilize Fischer
projections further, you will be so advised.
(a) Give the (R,S) designations for each chirality center in compound A and for
compound B. (b) Write the Fischer projection formula for a compound C that is the
diastereomer of A and B. (c) Would C be optically active?
• PRACTICE PROBLEM 5.26
Transcribed Image Text:CH3 ald CH3 CH3 Br H Br rotate H- Br 180° H- in H. Br Br Br H- plane [ HELPFUL HINT ] CH3 Build hand-held models of A and A B and relate them to the Fischer projections shown here. Same structure Not the same (Flipping the projection formula over sideways creates the projection CH3 formula for the H- Br enantiomer of A.) Br- H- Not the same (Flipping the projection formula over end for end creates the projection formula for the enantiomer of A.) Because Fischer projections must be used with such care, we introduce them now only so that you can understand Fischer projections when you see them in the context of other courses. Our emphasis for most of this book will be on the use of solid and dashed wedges to represent three-dimensional formulas (or chair conformational structures in the case of cyclohexane derivatives), except in Chapter 22 when we will use Fischer projec- tions again in our discussion of carbohydrates. If your instructor wishes to utilize Fischer projections further, you will be so advised. (a) Give the (R,S) designations for each chirality center in compound A and for compound B. (b) Write the Fischer projection formula for a compound C that is the diastereomer of A and B. (c) Would C be optically active? • PRACTICE PROBLEM 5.26
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