SEARCH Articles Figures Tables Action of Carbon Dioxide on an Organo-magnesium Halide (Grignard) Action of Dimethyl Sulphate on Magnesium Alkyl or Aryl Halide (Grignard) Halides magnesium Halides, magnesium. Grignard reagents Magnesium, reaction with alkyl halides form Grignard reagents Reaction XIV.—(a) Action of Magnesium Alkyl or Aryl Halide on Aldehydes and Ketones (Grignard)