Amines

Page 1: Introduction to Amines

Page 2: Nature of Amines

Definition of Amines

• Amines are derivatives of ammonia.

• One or more hydrogen atoms in ammonia are replaced with alkyl or aromatic groups.

• The nitrogen atom (N) in amines is attached to one or more alkyl or aromatic groups.

Page 3: Naming Amines (IUPAC)

IUPAC Naming Rules

• In IUPAC naming for amines, the "e" of the corresponding alkane name is replaced with "amine".

• Amines with three or more carbon atoms are numbered to indicate the position of the amine group and any other substituents.

Page 4: Naming with Alkyl Groups

Additional IUPAC Naming Rules

• If there is an alkyl group attached to the nitrogen atom, prefix "N-" and alkyl name precede the amine name.

• When two alkyl groups are bonded to the N atom, the prefix "N-" is used for each alkyl, and they are listed alphabetically.

Page 5: Learning Check

Practice Question

• Write the IUPAC name for the following amine:

  • (Content for this page seems to be incomplete; refer to examples in subsequent pages.)

Page 6: Solution Approach – Step 1

Naming the Longest Carbon Chain

• Step 1: Identify the longest carbon chain bonded to the nitrogen atom.

• Replace the "e" in the alkane's name with "amine" for the amine name.

Page 7: Solution Approach – Step 2

Numbering the Carbon Chain

• Step 2: Number the carbon chain to indicate the position of the amine group and other substituents.

Page 8: Solution Approach – Step 3

Indicating Alkyl Groups

• Step 3: Any alkyl group attached to the nitrogen atom is indicated by the prefix "N-" followed by the alkyl name, placed in front of the amine name.

Page 9: Common Names of Amines

Use of Common Names

• Common names are preferred when alkyl groups are not branched.

• List the names of alkyl groups attached to the N atom alphabetically in front of the amine name.

• Use prefixes "di-" and "tri-" to denote duplicate alkyl substituents.

  • Examples: Ethylamine, Dimethylamine, Ethyldimethylamine.

Page 10: Aromatic Amines

IUPAC Naming of Aromatic Amines

• The amine derivative of benzene is known as aniline by IUPAC.

• Alkyl groups on the nitrogen use the prefix "N-" followed by the alkyl name.

• Aniline is significant in the production of many dyes used in textiles.

Page 11: Classification of Amines

Types of Amines

• Amines are classified by the number of carbon groups bonded to the nitrogen atom:

  • Primary Amine: one carbon group bonded to nitrogen.

  • Secondary Amine: two carbon groups bonded to nitrogen.

  • Tertiary Amine: three carbon groups bonded to nitrogen.

Page 12: Learning Check 2

Practice Question

• Give the common name for each amine and classify it as primary, secondary, or tertiary:

  • A.

  • B.

Page 13: Solution to Learning Check 2

Common Names and Classification

• A. Propylamine (Primary)

• B. Ethyldimethylamine (Secondary)

Page 14: Learning Check 3

Practice Question

• Provide the common name of each amine compound:

  • A.

  • B.

Page 15: Solution to Learning Check 3

Common Names

• A. Diethylmethylamine

• B. N-ethylaniline

Page 16: Line-Angle Formulas of Amines

Skeletal Structures

• Line-angle formulas depict the shapes of amine molecules with one or more alkyl groups bonded to the nitrogen atom.