Chapter 21, Problem 21.79P

Interpretation Introduction

(a)

Interpretation: The structure of the acyclic polyhydroxy aldehyde that cyclizes to given hemiacetal is to be stated.

Concept introduction: Hemiacetals are the groups in which a carbon atom is bonded to one $\text{OH}$ group, and one $\text{OR}$ group. The first part for the formation of acetal is the addition of one equivalent of alcohol to form a hemiacetal. The formation of a cyclic hemiacetal is an acid catalyzed reaction.

Interpretation Introduction

(b)

Interpretation: The structure of the acyclic polyhydroxy aldehyde that cyclizes to given hemiacetal is to be stated.

Concept introduction: Hemiacetals are the groups in which a carbon atom is bonded to one $\text{OH}$ group, and one $\text{OR}$ group. The first part for the formation of acetal is the addition of one equivalent of alcohol to form a hemiacetal. The formation of a cyclic hemiacetal is an acid catalyzed reaction.