Chemistry Reference
In-Depth Information
Staggered conformations are more stable than eclipsed conformations. Therefore A
and B are more stable than C or D. Within each pair, CH
3
-CH
3
interactions (for
methyls on adjacent carbons) are avoided because of the large size of these groups.
2.38
By sighting down the C2-C3 bond, we have:
2.39
Br
Br
Br
Br
H
Cl
H
H
H
Cl
Cl
H
H
H
H
H
H
H
H
H
H
H
Cl
H
Br
H
Br
H
Br
H
Br
Cl
H
Cl
H
H
H
H
H
H
H
Cl
H
H
H
Cl
H
H
H
Cl
H
Br
H
H
Br
Cl
H
Br
H
Br
Cl
H
Cl
H
H
H
H
H
H
H
H
H
The stability decreases from left to right in each series of structures.
a.
b.
2.40
For
trans
-1,4-substituents, one
substituent is axial and the other is
equatorial.
For 1,3-substitution and
trans
, one
substituent is axial and the other is
equatorial. The larger isopropyl
group would be equatorial.
c.
d.
One ethyl group would be
equatorial.
