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Locate the isoprene units in each compound.
a. 
b. 
(a)
Interpretation: The isoprene units in the given compound are to be located.
Concept introduction: An isoprene unit possesses following properties.
➢ It may either consist of
➢ It is always connected by one or more
➢ Each isoprene unit is consist of
➢ While locating an isoprene unit, the presence of heteroatoms is ignored.
Answer to Problem 18P
The isoprene units in the given terpene (
Explanation of Solution
The given compound (
Figure 1
Terpenes are composed of repeating five-carbon units. These units are called isoprene units.
Figure 2
An isoprene unit possesses following properties.
➢ It involves one branched carbon and
➢ It may either consist of
➢ It is always connected by one or more
➢ Each isoprene unit is consist of
➢ While locating an isoprene unit, the presence of heteroatoms is ignored.
The isoprene units in the given terpene (
Figure 3
The isoprene units in the given compound (
(b)
Interpretation: The isoprene units in the given compound are to be located.
Concept introduction: An isoprene unit possesses following properties.
➢ It may either consist of
➢ It is always connected by one or more
➢ Each isoprene unit is consist of
➢ While locating an isoprene unit, the presence of heteroatoms is ignored.
Answer to Problem 18P
The isoprene units in the given terpene (humulene) are located as,
Explanation of Solution
The given compound (humulene) is a terpene. Its structure is in ball-and stick form. It is converted into skeletal structure by replacing black ball with
Figure 4
Terpenes are composed of repeating five-carbon units. These units are called isoprene units.
Figure 2
An isoprene unit possesses following properties.
➢ It involves one branched carbon and
➢ It may either consist of
➢ It is always connected by one or more
➢ Each isoprene unit is consist of
➢ While locating an isoprene unit, the presence of heteroatoms is ignored.
The isoprene units in the given terpene (humulene) are located as,
Figure 5
The isoprene units in the given compound (humulene) are located in Figure 5.
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Chapter 29 Solutions
ORGANIC CHEMISTRY
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