CIE A Level Chemistry复习笔记3.5.5 Iodoform Reaction
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
The reaction of ethanal with iodoform results in the formation of a yellow CHI3 precipitate转载自savemyexams
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