Isomerism and Stereochemistry


1003. Which of the following is different?


1004. Choose the thermodynamically most stable isomer.

Choose the thermodynamically least stable isomer.
A B C



1041.

has how many stereo centers? 0, 1, 2


1042. The selective synthesis of specific enantiomers of epoxides can be performed using enantiomers of Jacobsen's catalyst and subtle changes in reaction conditions. Enantiomers of phenylpropylene oxide,

, can be made this way.

 

How many enantiomers of phenylpropylene oxide are there? 1, 2, 4


1049. Choose the correct products for these reactions:

a.

 

A. B. C. D.

 

b.



A. B. C. D.


1050. Choose the correct products for these reactions:


a.

A. B. C. D.

 

b.

A. B. C. D.


1051. Choose the correct product for this reaction:

A. B. C.

D.


1084. a. What is the R and S configuration for each stereogenic center in this sugar, from top to bottom?

 

R, R, S R, S, S R, S, R

 

b. Is this a D or L sugar?

 

c. What is the R and S configuration for each stereogenic center in this sugar, from top to bottom?

 

R, R, S R, S, S R, S, R

 

b. Is this a D or L sugar?


1095. How many isomers have the name bromomethylcyclopentane? (ignoring chirality)

A. 4

B. 5

C. 6

D. 7


1097. How many stereocenters (not including any N centers) are there in morphine, whose structure is shown below?

A. 4

B. 5

C. 6

D. More than 6


1098. Is the structure shown below R or S?

A. R

B. S


1099. Is the structure shown below R or S?

A. R

B. S


1100. The stereochemistry of this molecule is:

A. 1R, 3R

B. 1R, 3S

C. 1S, 3S

D. 1S, 3R


1101. Pure (S)-2-butanol has a specific rotation of +13.52 degrees. A sample of 2-butanol prepared in the lab and purified by distillation has a calculated specific rotation of +6.76 degrees. What can you conclude about the composition?

A. 50% (S), 50% impurity

B. 50% (S), 50% (R)

C. 50% (S), 50% racemic

D. some other mixture




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