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This final section of the chapter deals with a few named reactions in which enolate anions react with other carbonyl compounds as nucleophiles – so these could realistically have been placed under the nucleophilic addition chapter.
Because of the lack of leaving group on these carbonyls (the leaving group would have to be an alkyl group leaving as a carbanion – not generally very stable), they react differently to the general reactions discussed on the previous page.
A carbonyl is a molecule containing the C=O functional group. For the purposes of this chapter they will be split into 2 categories – one category will be ketones and aldehydes, the other will include pretty much everything else.