Concept explainers
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 (6th Edition)
- Label each compound as chiral or achiral. Compounds that contain a single carbon common to two rings are called spiro compounds. Because carbon is tetrahedral, the two rings are perpendicular to each other.arrow_forwardClassify attached pair of compounds as constitutional isomers or stereoisomers ?arrow_forwardGive the IUPAC name for each alkene.arrow_forward
- What alkylborane is formed from hydroboration of each alkene?arrow_forwardDraw all stereoisomers formed when each alkene is treated with CHCl3 and KOC(CH3)3.arrow_forwardDraw the products formed when each alkene is treated with BH3 followed by H2O2,HO−. Include the stereochemistry at all stereogenic centers.arrow_forward
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