Chapter 26, Problem 26.1P

Interpretation Introduction

(a)

Interpretation:

The structure of $4-\left(\text{dimethylamino}\right)\text{pyridine}$ is to be drawn.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is done such that the structure of the organic compound is correctly interpreted from the name.

Rules for writing IUPAC name from the structural formula are given below.

• First, identify the longest carbon chain.
• The next step is to identify the groups attached to the longest chain.
• Identify the position, location, and a number of the substituents bonded to the carbon chain.
• Use prefix di, tri, tetra if the same type of substituents is present.
• Name the substituents in alphabetical order.
• In the heterocyclic compound, azo for nitrogen, oxo for oxygen, thio for sulfur and so on is used.

Answer to Problem 26.1P

The structure of the given compound, $4-\left(\text{dimethylamino}\right)\text{pyridine}$ is shown below.

Explanation of Solution

The name of the given compound $4-\left(\text{dimethylamino}\right)\text{pyridine}$ suggest that it contains a pyridine ring. The pydridine ring is substituted at $\text{C4}$ position. The substitutent dimethylamino is substituted at poition $\text{C4}$. Therefore, the structure of $4-\left(\text{dimethylamino}\right)\text{pyridine}$ is shown below.

Figure 1

Conclusion

The structure of the given compound, $4-\left(\text{dimethylamino}\right)\text{pyridine}$ is shown in Figure 1.

Interpretation Introduction

(b)

Interpretation:

The structure of $4-\text{ethyl}-2-\text{nitroimidazole}$ is to be drawn.

Concept introduction:

The systematic naming of organic compound is given by IUPAC nomenclature. The naming of organic compound is done such that the structure of the organic compound is correctly interpreted from the name.

Rules for writing IUPAC name from the structural formula are given below.

• First, identify the longest carbon chain.
• The next step is to identify the groups attached to the longest chain.
• Identify the position, location, and a number of the substituents bonded to the carbon chain.
• Use prefix di, tri, tetra if the same type of substituents is present.
• Name the substituents in alphabetical order.
• In the heterocyclic compound, azo for nitrogen, oxo for oxygen, thio for sulfur and so on is used.

Answer to Problem 26.1P

The structure of the given compound, $4-\text{ethyl}-2-\text{nitroimidazole}$ is shown below.

Explanation of Solution

The given compound $4-\text{ethyl}-2-\text{nitroimidazole}$ suggests that it contains an imidazole ring that means a five-membered ring with the nitrogen atom at first and third position. The imidazole ring is substituted at $\text{C2}$ and $\text{C4}$ positions. The $\text{C4}$ position contains ethyl group and $\text{C2}$ position contains a nitro group. Therefore, the structure of $4-\text{ethyl}-2-\text{nitroimidazole}$ is shown below.

Figure 2

Conclusion

The structure of the given compound, $4-\text{ethyl}-2-\text{nitroimidazole}$ is shown in Figure 2.