Grignard reaction
The Grignard reaction (pronounced ) is an organometallic chemical reaction in which alkyl, allyl, vinyl, or aryl-magnesium halides (Grignard reagent) is added to a carbonyl group in an aldehyde or ketone. This reaction is important for the formation of carbon–carbon bonds. The reaction of an organic halide with magnesium is "not" a Grignard reaction, but provides a Grignard reagent.