1
Q
If H is coming towards you?
A
Absolute configuration is opposite
2
Q
Enantiomers
A
Opposite at every chiral center
3
Q
Diastereomers
A
A least one chiral center is reversed
4
Q
How many stereoisomers possible?
A
2^ # of stereocenters
5
Q
How many enantiomers possible?
A
1
6
Q
If symmetrical…
A
It’s achiral
7
Q
If chiral with chiral centers
A
It is Meso
8
Q
Are trans or cis isomers more stable?
A
Trans
9
Q
The EZ way to label chirality
A
-Split bond down the middle
-assign priority
-Z ze zame zide, E the opposite side
- write “ (1Z)- “ in locant order
10
Q
In Fischer projections what is coming towards you?
A
Horizontal bonds (therefore everything is reversed)
11
Q
A racemic mixture is…
A
50/50
12
Q
Enantiomeric excess
A
the difference between the percentage of 2 enantiomers (T1 - T2)
13
Q
Optical purity
A
[x]sample / [x]pure-enantiomer x 100
