Chapter 23, Problem 23.1P

Draw the enol or keto tautomer(s) of each compound.

a. c. e.

b. d. f. [Draw mono enol

tautomers only]

Interpretation Introduction

(a)

Interpretation: The enol or keto tautomer of the given compound is to be drawn.

Concept introduction: The chemical equilibrium that exists between a keto form of a compound and an enol form of the same compound is known as keto-enol tautomerism. Tautomers refer to these keto and enol forms. The keto-enol tautomerism takes place only if the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Answer to Problem 23.1P

The enol or keto tautomer of the given compound is shown below.

Explanation of Solution

The enol or keto tautomer of the given compound is shown as,

Figure 1

The keto form of the given enol form of a compound is shown appropriately because it contains the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Conclusion

The enol or keto tautomer of the given compound is shown in Figure 1.

Interpretation Introduction

(b)

Interpretation: The enol or keto tautomer of the given compound is to be drawn.

Concept introduction: The chemical equilibrium that exists between a keto form of a compound and an enol form of the same compound is known as keto-enol tautomerism. Tautomers refer to these keto and enol forms. The keto-enol tautomerism takes place only if the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Answer to Problem 23.1P

The enol or keto tautomer of the given compound is shown below.

Explanation of Solution

The enol or keto tautomer of the given compound is shown as,

Figure 2

The enol form of the given keto form of a compound is shown appropriately because it contains the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Conclusion

The enol or keto tautomer of the given compound is shown in Figure 2.

Interpretation Introduction

(c)

Interpretation: The enol or keto tautomer of the given compound is to be drawn.

Concept introduction: The chemical equilibrium that exists between a keto form of a compound and an enol form of the same compound is known as keto-enol tautomerism. Tautomers refer to these keto and enol forms. The keto-enol tautomerism takes place only if the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Answer to Problem 23.1P

The enol or keto tautomer of the given compound is shown below.

Explanation of Solution

The enol or keto tautomer of the given compound is shown as,

Figure 3

The enol form of the given keto form of a compound is shown appropriately because it contains the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Conclusion

The enol or keto tautomer of the given compound is shown in Figure 3.

Interpretation Introduction

(d)

Interpretation: The enol or keto tautomer of the given compound is to be drawn.

Concept introduction: The chemical equilibrium that exists between a keto form of a compound and an enol form of the same compound is known as keto-enol tautomerism. Tautomers refer to these keto and enol forms. The keto-enol tautomerism takes place only if the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Answer to Problem 23.1P

The enol or keto tautomer of the given compound is shown below.

Explanation of Solution

The enol or keto tautomer of the given compound is shown as,

Figure 4

The keto form of the given enol form of a compound is shown appropriately because it contains the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Conclusion

The enol or keto tautomer of the given compound is shown in Figure 4.

Interpretation Introduction

(e)

Interpretation: The enol or keto tautomer of the given compound is to be drawn.

Concept introduction: The chemical equilibrium that exists between a keto form of a compound and an enol form of the same compound is known as keto-enol tautomerism. Tautomers refer to these keto and enol forms. The keto-enol tautomerism takes place only if the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Answer to Problem 23.1P

The enol or keto tautomer of the given compound is shown below.

Explanation of Solution

The enol or keto tautomer of the given compound is shown as,

Figure 5

The enol form of the given keto form of a compound is shown appropriately because it contains the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Conclusion

The enol or keto tautomer of the given compound is shown in Figure 5.

Interpretation Introduction

(f)

Interpretation: The enol or keto tautomer of the given compound is to be drawn.

Concept introduction: The chemical equilibrium that exists between a keto form of a compound and an enol form of the same compound is known as keto-enol tautomerism. Tautomers refer to these keto and enol forms. The keto-enol tautomerism takes place only if the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Answer to Problem 23.1P

The enol or keto tautomer of the given compound is shown below.

Explanation of Solution

The enol or keto tautomer of the given compound is shown as,

Figure 6

The enol form of the given keto form of a compound is shown appropriately because it contains the acidic hydrogen is present at the $\alpha -\text{carbon}$ atom.

Conclusion

The enol or keto tautomer of the given compound is shown in Figure 6.