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Stereochemistry

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Organic Chemistry 1 Textbook > Stereochemistry & Isomers

Stereoisomers IIIb - Optical Isomers

4 Activities

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Mark Yourself Question
  1. Grab a piece of paper and try this problem yourself.
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Assign R/S for any asymmetric carbons in the following examples.


Once you have assigned the R/S configuration of an asymmetric carbon, you must then put it together with the name. The R/S assignment acts much like a substituent and is added as a prefix to the chemical’s name. Try naming the first compound and adding the R/S prefix.






More Stereoisomers IIIb - Optical Isomers Questions:
Optical Isomers
How does plane-polarized light interact with (zero/non-zero):
a chiral molecule
a racemic mixture
Optical isomers: Carbohydrates
Pure β-D-mannopyranose (shown below) has optical activity (specific rotation, α, = -17.0°). In water, the optical activity rapidly changes until after 3 hours α = +14.6°. What is going on? Hint: use pictures to explain.
Stereochemistry
Choose the correct statement:
Finding Relationships between Compounds
Find the relationship between the compounds in each pair:
1.
2.
Optical isomers: Carbohydrates
Pure β-D-mannopyranose (shown below) has optical activity (specific rotation, α, = -17.0°). In water, the optical activity rapidly changes until after 3 hours α = +14.6°. What is going on? Hint: use pictures to explain.
Optical Isomers
Practice: Optical Isomers
How does plane-polarized light interact with (zero/non-zero):
a chiral molecule
Select the Meso compound
What is the relationship between the two molecules below?
What is the relationship between the two molecules below?
What is the relationship between the two molecules below?
What is the relationship between the two molecules below?
What is the relationship between the two molecules below?
Stereoisomers
Draw all stereoisomers of each of the compounds and write the relationships between them:
Stereoisomerism
What is the relationship between the two compounds in each pair:
Optical Rotation
Rank the following three triols in terms of their optical rotation in increasing order (the specific rotation of the reference compound is given):
Relationships Between Compounds
Find out the relationship between the compounds in each pair:
1.
2.
Relationship
What is the relationship between the two compounds in each pair:
1.
2.
Finding Relationships between Compounds
Find the relationship between the compounds in each pair:
1.
2.
Stereoisomers
Which structure(s) represent(s) diasteromer(s) of I
Optical isomers
Pure β-D-mannopyranose (shown below) has optical activity (specific rotation, α, = -17.0°).
In water, the optical activity rapidly changes until after 3 hours α = +14.6°. What is going on? (Use pictures)
Stereoisomers
What is the relationship between the following compounds
Which of the following is an enantiomer?
Optical Isomers
How does plane-polarized light interact with a chiral molecule? A racemic mixture? A meso compound?
Stereoisomers
Circle all asymmetric centers and label them as R or S
Stereoisomer practice problems
Are the compounds enantiomers (E), diastereomers (D), identical (I) or unrelated (U).
a)
b)
Naming Chiral Compounds
Assign R/S to the following compounds:
Enter answer as (R) (S) (R,R) (S,S), etc or no chiral compounds
Stereoisomers
Assign the isomeric relationship between the following compounds (conformers, enantiomers, diastereomers, constitutional isomers, identical compound):
Stereoisomers: Optical Isomers
Enantiomers do NOT ever display different …
Which of the following can exist in optically active forms?
Which of the following is a diastereomer of I?
Which of the following is an enantiomer of I?
Which of the following is a meso compound?
Stereoisomers: Optical isomers, Meso compound
Select the Meso compound
Stereoisomers: Optical isomers
What is the relationship between the following compounds
Stereoisomers: Optical isomers
What is the relationship between the following compounds
Stereoisomers: Optical isomers
What is the relationship between the following compounds
Stereoisomers: Optical isomers
What is the relationship between the following compounds