Aldehydes, Ketones, and Carboxylic Acids

Introduction to Carbonyl Compounds

Organic compounds containing a carbon-oxygen double bond (carbonyl group) are fundamental in organic chemistry. The nature of the groups attached to the carbonyl carbon determines whether the compound is an aldehyde, ketone, or carboxylic acid.

• Aldehydes: The carbonyl group is bonded to at least one hydrogen atom.

• Ketones: The carbonyl group is bonded to two carbon atoms.

• Carboxylic Acids: The carbonyl group is bonded to a hydroxyl group (-OH).

General structures:

• Aldehyde:

• Ketone:

• Carboxylic Acid:

Nomenclature and Structure of Carbonyl Compounds

The naming of carbonyl compounds follows specific rules based on the functional group present. The suffixes and prefixes used help identify the type of compound.

Aldehydes

• Functional group:

• Suffix used: -al (e.g., ethanal)

• Prefix used: formyl- (when the group is a substituent)

Ketones

• Functional group: (carbonyl group within the carbon chain)

• Suffix used: -one (e.g., propanone)

• Prefix used: keto- or oxo- (when the group is a substituent)

Common Names of Carbonyl Compounds

Many simple aldehydes and ketones are known by their common names, which are often derived from the names of the corresponding carboxylic acids or the number of carbon atoms present.

Examples of Common and IUPAC Names:

Key Points:

• The formyl group () is characteristic of aldehydes.

• Ketones have the carbonyl group bonded to two carbon atoms, and their common names are often derived by naming the alkyl groups attached to the carbonyl carbon followed by the word 'ketone'.

• Carboxylic acids contain the group and are named with the suffix -oic acid (not detailed in the provided notes, but important for context).

Example: The compound CH3CH2CHO is called propionaldehyde (common name) and propanal (IUPAC name).

Additional info: The notes focus on the structure and nomenclature of simple aldehydes and ketones, with a brief mention of carboxylic acids. For a complete understanding, students should also study the physical and chemical properties, as well as the reactivity of these functional groups.