Grignard reaction is an organometallic chemical reaction in alkyl, allyl, vinyl or aryl-magnesium halides (Grignard reagent) add to a carbonyl group in an aldehyde or ketone. This reaction is important for the formation of carbon–carbon bonds.

Grignard reagents are formed by the reaction of magnesium metal with alkyl or alkenyl halides. They're extremely good nucleophiles, reacting with electrophiles such as carbonyl compounds.Example:aldehydes, ketones.

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