Chapter 13, Problem 13.82QP

(a)

Interpretation Introduction

Interpretation:

The structure has to be identified as acetal or hemiacetal.

Concept Introduction:

Hemiacetal is characterized by a carbon, which is bonded to one hydroxyl group $\left(\text{-OH}\right)$ and one alkoxy group $\left(\text{-OR}\right)\text{.}$

Hemiacetals are unstable.  In the presence of acid and excess alcohol, they undergo a substitution reaction in which the $\text{-OH}$ group of the hemiacetal is exchange for another $\text{-OR}$ group from the alcohol.  The product formed is called as acetal.  A carbon bonded to two alkoxy groups $\left(\text{-OR}\right)$ is the called as acetal.

(b)

Interpretation Introduction

Interpretation:

The structure has to be identified as acetal or hemiacetal.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The structure has to be identified as acetal or hemiacetal.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

The structure has to be identified as acetal or hemiacetal.

Concept Introduction:

Refer to part (a).

(e)

Interpretation Introduction

Interpretation:

The structure has to be identified as acetal or hemiacetal.

Concept Introduction:

Refer to part (a).

(f)

Interpretation Introduction

Interpretation:

The structure has to be identified as acetal or hemiacetal.

Concept Introduction:

Refer to part (a).