Chapter 31, Problem 31.10P

Locate the isoprene units in each compound.

a. c.

b. d.

Interpretation Introduction

(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 $\text{C}-\text{C}\text{σ}$ bonds only or $\text{π}$ bonds at any position.

➢ It is always connected by one or more $\text{C}-\text{C}$ bonds.

➢ Each isoprene unit is consist of $5\text{C's}$.

➢ While locating an isoprene unit, the presence of heteroatoms is ignored.

Answer to Problem 31.10P

The isoprene units in the given terpene (geraniol) are located as,

Explanation of Solution

Terpenes are composed of repeating five-carbon units. These units are called isoprene units.

Figure 1

An isoprene unit possesses following properties.

➢ It involves one branched carbon and $\text{4}\text{C's}$ in a row.

➢ It may either consist of $\text{C}-\text{C}\text{σ}$ bonds only or $\text{π}$ bonds at any position.

➢ It is always connected by one or more $\text{C}-\text{C}$ bonds.

➢ Each isoprene unit is consist of $5\text{C's}$, with $\text{4}\text{C's}$ in a row and one-carbon branch on a middle carbon.

➢ While locating an isoprene unit, the presence of heteroatoms is ignored.

The isoprene units in the given terpene (geraniol) are located as,

Figure 2

Conclusion

The isoprene units in the given terpene (geraniol) are located in Figure 2.

Interpretation Introduction

(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 $\text{C}-\text{C}\text{σ}$ bonds only or $\text{π}$ bonds at any position.

➢ It is always connected by one or more $\text{C}-\text{C}$ bonds.

➢ Each isoprene unit is consist of $5\text{C's}$.

➢ While locating an isoprene unit, the presence of heteroatoms is ignored.

Answer to Problem 31.10P

The isoprene units in the given terpene (vitamin A) are located as,

Explanation of Solution

Terpenes are composed of repeating five-carbon units. These units are called isoprene units.

Figure 1

An isoprene unit possesses following properties.

➢ It involves one branched carbon and $\text{4}\text{C's}$ in a row.

➢ It may either consist of $\text{C}-\text{C}\text{σ}$ bonds only or $\text{π}$ bonds at any position.

➢ It is always connected by one or more $\text{C}-\text{C}$ bonds.

➢ Each isoprene unit is consist of $5\text{C's}$, with $\text{4}\text{C's}$ in a row and one-carbon branch on a middle carbon.

➢ While locating an isoprene unit, the presence of heteroatoms is ignored.

The isoprene units in the given terpene (vitamin A) are located as,

Figure 3

Conclusion

The isoprene units in the given terpene (vitamin A) are located in Figure 3.

Interpretation Introduction

(c)

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 $\text{C}-\text{C}\text{σ}$ bonds only or $\text{π}$ bonds at any position.

➢ It is always connected by one or more $\text{C}-\text{C}$ bonds.

➢ Each isoprene unit is consist of $5\text{C's}$.

➢ While locating an isoprene unit, the presence of heteroatoms is ignored.

Answer to Problem 31.10P

The isoprene units in the given terpene (grandisol) are located as,

Explanation of Solution

Terpenes are composed of repeating five-carbon units. These units are called isoprene units.

Figure 1

An isoprene unit possesses following properties.

➢ It involves one branched carbon and $\text{4}\text{C's}$ in a row.

➢ It may either consist of $\text{C}-\text{C}\text{σ}$ bonds only or $\text{π}$ bonds at any position.

➢ It is always connected by one or more $\text{C}-\text{C}$ bonds.

➢ Each isoprene unit is consist of $5\text{C's}$, with $\text{4}\text{C's}$ in a row and one-carbon branch on a middle carbon.

➢ While locating an isoprene unit, the presence of heteroatoms is ignored.

The isoprene units in the given terpene (grandisol) are located as,

Figure 4

Conclusion

The isoprene units in the given terpene (grandisol) are located in Figure 4.

Interpretation Introduction

(d)

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 $\text{C}-\text{C}\text{σ}$ bonds only or $\text{π}$ bonds at any position.

➢ It is always connected by one or more $\text{C}-\text{C}$ bonds.

➢ Each isoprene unit is consist of $5\text{C's}$.

➢ While locating an isoprene unit, the presence of heteroatoms is ignored.

Answer to Problem 31.10P

The isoprene units in the given terpene (camphor) are located as,

Explanation of Solution

Terpenes are composed of repeating five-carbon units. These units are called isoprene units.

Figure 1

An isoprene unit possesses following properties.

➢ It involves one branched carbon and $\text{4}\text{C's}$ in a row.

➢ It may either consist of $\text{C}-\text{C}\text{σ}$ bonds only or $\text{π}$ bonds at any position.

➢ It is always connected by one or more $\text{C}-\text{C}$ bonds.

➢ Each isoprene unit is consist of $5\text{C's}$, with $\text{4}\text{C's}$ in a row and one-carbon branch on a middle carbon.

➢ While locating an isoprene unit, the presence of heteroatoms is ignored.

The isoprene units in the given terpene (camphor) are located as,

Figure 5

Conclusion

The isoprene units in the given terpene (camphor) are located in Figure 5.