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CIE A Level Chemistry復(fù)習(xí)筆記3.5.5 Iodoform Reaction

Category: A-level課程, 教材筆記, 福利干貨 Date: 2022年8月12日 下午5:41

Iodoform Reaction

  • Tri-iodomethane?(also called?iodoform) forms a?yellow precipitate?with?methyl ketones
    • Methyl ketones are compounds that have a CH3CO-group
    • Ethanal?also contains a CH3CO- group and therefore also forms a yellow precipitate with iodoform
  • The reagent is?heated?with an?alkaline?solution of?iodine
  • This reaction involves a?halogenation?and?hydrolysis?step
    • In the?halogenation?step, all three H-atoms in the -CH3 (methyl) group are replaced with iodine atoms,?forming a?-CI3 group
    • The intermediate compound is hydrolysed by an?alkaline?solution to form a sodium salt (RCO2- Na+) and a yellow precipitate of?CHI3
3.5-Carbonyl-Compounds-Iodoform-Test The reaction of ethanal with iodoform results in the formation of a yellow CHI3 precipitate

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