Stereoisomers

Question 1

Wedge

Answer 1

Projects towards viewers

Question 2

Dash

Answer 2

Projects away from viewer

Question 3

Single Carbon Stereocenters Labeling

Answer 3

Labeled according to priority
-Priority assigned based on highest atomic number

-Atom 1 is the highest priority
-Atom 4 is least priority

Question 4

R Stereoisomer

Answer 4

1. If ordering is clockwise (to the right) and atom 4 on dash
2. If ordering is counterclockwise, but atom 4 (lowest priority) is on the wedge

Question 5

S Stereoisomer

Answer 5

1. If ordering is counterclockwise (to the left) and atom 4 on dash
2. If ordering is clockwise, but atom 4 (lowest priority) is on the wedge

Question 6

Alkene Stereocenters

Answer 6

1. Must have 2 different groups attach to each carbon of the double bond
2. Atoms attached are prioritized according to increasing atomic number
   - If 2 or more atoms are the same, look at what they are attached to find difference to assign priority

Question 7

Z- Stereoisomer

Answer 7

Priority Groups on same side of double bond

Question 8

E- Stereoisomer

Answer 8

Priority groups on opposite sides of double bond

Question 9

Enantiomer

Answer 9

-May have 1 or more stereocenters
-All stereo centers must be switched between 2 structures
-Have all same physical properties except optical rotation

Question 10

Diastereomer

Answer 10

-Minimum of 2 stereocenters
-At least 1 Stereocenters remains the same
-Completely different physical properties