Chapter 9.4, Problem 5P

Interpretation Introduction

a)

Interpretation:

The alkyne which can be used as a starting material for preparing methyl-n-propyl ketone is to be stated.

Concept introduction:

Addition of water to triple bonds occurs to yield an enol initially as the product. The enol then tautomerizes to give a ketone as the final product. Terminal alkynes and symmetrically substituted internal alkynes yield only one product. Unsymmetrically substituted internal alkynes yield a mixture of ketones as product.

To state:

The alkyne which can be used as a starting material for preparing methyl-n-propyl ketone.

b)

Interpretation Introduction

Interpretation:

The alkyne which can be used as a starting material for preparing diethyl ketone is to be stated.

Concept introduction:

Addition of water to triple bonds occurs to yield an enol initially as the product. The enol tautomerizes to give a ketone as the final product. Terminal alkenes and symmetrically substituted internal alkynes yield only one product. Unsymmetrically substituted internal alkynes yield a mixture of ketones as product.

To state:

The alkyne which can be used as a starting material for preparing diethyl ketone.