Chemistry Reference
In-Depth Information
Then fill in the groups in priority order, counterclockwise (
S
),
Similarly,
CH
3
Bu
H
Bu
H
H
3
C
or
or
H
Bu
CH
3
As you can see, there are many ways to write the correct answer. In
subsequent problems, only one correct way will be shown. Work with models
if you have difficulty.
b.
The same rules apply for cyclic and acyclic compounds.
H
C
H
3
c.
The priority around the stereogenic center is as follows:
5.12
a.
The priority order at each doubly bonded carbon is CH
3
> H and CH
3
CH
2
> H.
The configuration is
E
.
CH
3
H
H
CH
2
CH
3
(
E
-2-pentene
b.
The priority order is Br > F and Cl > H. The configuration is
E
.
