16. Carboxylic Acids and Their Derivatives

Aspirin also known as acetylsalicylic acid possesses an ester group that is formed from the reaction between ethanoic acid and salicylic acid. Determine the structure of aspirin after the condensation between ethanoic acid and salicylic acid. 

Consider the following unnatural amino acid: <IMAGE>

a. If two molecules react to form an ester, what is the structure of the ester product?

Consider the following unnatural amino acid: <IMAGE>

c. Draw the cyclic ester resulting from the intramolecular reaction of the hydroxyl group of this amino acid with its carboxyl group (cyclic esters are called lactones).

Draw structures of the carboxylic acids and alcohols you would use to prepare each ester in Problem 17.54.

Each of the following materials has an ester that is responsible for its smell and/or flavor. Search the internet and determine what that ester is, draw its structure, and what carboxylic acid and alcohol are used to form it. 

a. Juicy Fruit gum flavoring