Addition to carbonyl groups varies depending on the type of carbonyl. The following trend is observed:
Some important topics related to carbonyl addition reactions are listed below. Reactions of enolates with other carbonyl compounds can be found in the Enolates section.
Aldehydes and Ketones
Reduction can be avoided by the addition of Cerium(III) Chloride:
The Weinreb amide is a useful funcitonal group to synthesize ketones.