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Q.33.

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Organic Chemistry
Found in: Page 91

Short Answer

Question: Identify each functional group located in the following rings. Which structure represents a lactone-a cyclic ester- and which represents a lactam-a cyclic amide?

a.

b.

c.

d.

Answer

a. The functional group located in the following ring is an amine. This structure represents neither a lactone nor a lactam.

b. The functional group located in the following ring is ether. This structure represents neither a lactone nor a lactam.

c. The functional group located in the following ring is an ester. This structure represents a lactone-acyclic ester.

d.The functional group located in the following ring is an amide. This structure represents a lactam-acyclic amide.

See the step by step solution

Step by Step Solution

Step 1:Functional group

Functional groups help in guiding several organic reactions. Compounds display their specific properties because of functional groups.

Step 2:Cyclic ester and cyclic amide

The esterification of certain carboxylic acids leads to the formation of cyclic esters like lactones. Cyclic amides like lactams can be obtained when amino acids undergo cyclization.

Step3:Classification of compounds to cyclic ester or cyclic amide

a.The functional group present in this compound is amine. Since nitrogen is connected to three carbon atoms, this amine is a tertiary one. Lactone is a cyclic ester, and lactam is a cyclic amide.

The given structure is a cyclic compound, but it does not contain an ester or an amide. Hence, this compound is neither a lactone nor a lactam.

b.The functional group present in this compound is ether. This compound has a cyclic ring but does not contain an ester or an amide group. Hence, this compound is neither a lactone nor a lactam.

c. The functional group present in this compound is an ester. The compound is present in the form of a cyclic ring and contains ester. Hence, this compound is a lactone-cyclic ester.

d.The functional group present in this compound is an amide. The structure is present in the form of a cyclic ring. Hence, this compound is a lactam-a cyclic amide.

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