Chapter 24.5, Problem 9PTS

(a)

Interpretation Introduction

Interpretation:

For each of the given bifunctional compounds, the cyclic hemiacetal formed when treated with aqueous acid should be drawn.

Concept introduction:

• Hemiacetal are formed for the compound having both hydroxyl group and aldehyde group in acidic condition.
• The oxygen atom in the –OH group of compound attacks the carbonyl group of the same compound, thereby a ring is formed by the carbon atoms and oxygen atom of –OH group with incorporating into the ring.

To draw: the hemiacetal formed for the given molecule when treated with aqueous acid.

(b)

Interpretation Introduction

Interpretation:

For each of the given bifunctional compounds, the cyclic hemiacetal formed when treated with aqueous acid should be drawn.

Concept introduction:

• Hemiacetal are formed for the compound having both hydroxyl group and aldehyde group in acidic condition.
• The oxygen atom in the –OH group of compound attacks the carbonyl group of the same compound, thereby a ring is formed by the carbon atoms and oxygen atom of –OH group with incorporating into the ring.

To draw: the hemiacetal formed for the given molecule when treated with aqueous acid.

(c)

Interpretation Introduction

Interpretation:

For each of the given bifunctional compounds, the cyclic hemiacetal formed when treated with aqueous acid should be drawn.

Concept introduction:

• Hemiacetal are formed for the compound having both hydroxyl group and aldehyde group in acidic condition.
• The oxygen atom in the –OH group of compound attacks the carbonyl group of the same compound, thereby a ring is formed by the carbon atoms and oxygen atom of –OH group with incorporating into the ring.

To draw: the hemiacetal formed for the given molecule when treated with aqueous acid.

(d)

Interpretation Introduction

Interpretation:

For each of the given bifunctional compounds, the cyclic hemiacetal formed when treated with aqueous acid should be drawn.

Concept introduction:

• Hemiacetal are formed for the compound having both hydroxyl group and aldehyde group in acidic condition.
• The oxygen atom in the –OH group of compound attacks the carbonyl group of the same compound, thereby a ring is formed by the carbon atoms and oxygen atom of –OH group with incorporating into the ring.

To draw: the hemiacetal formed for the given molecule when treated with aqueous acid.