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H
Cl
H
H
CC
CC
Cl
H
Cl
Cl
trans
-1,2-dichloroethene
cis
-1,2-dichloroethene
FIGURE 4.1
Example of
cis
(same) versus
trans
(opposite) isomers in a molecule.
H
3
C
CH
3
H
3
C
CH
3
cis
trans
FIGURE 4.2
Structures of the two isomers of the terpene β- ocimene in
cis
and
trans
forms.
4
CH
3
H
3
C
1
4
CH
3
H
2
3
2
3
CC
CC
1
H
3
C H
(
E
)-But-2-ene
H
H
(
Z
)-But-2-ene
FIGURE 4.3
E, Z isomers of but-2-ene.
FIGURE 4.4
Chemical structure of the naturally occurring terpenoid squalene.
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