SCHOTTEN BAUMANN REACTION MECHANISM

Schotten Baumann reaction mechanism

Schotten Baumann reaction mechanism is a convenient method for benzoylation of phenols with benzoyl chloride in presence of cold aqueous sodium hydroxide. The aqueous alkali reacts with the  hydrogen halide produced .
Schotten Baumann reaction mechanism
  

Schotten Baumann reaction mechanism

Schotten Baumann reaction mechanism
Aromatic amines (both primary and secondary) can also be benzoylated under the conditions of Schotten Baumann reaction mechanism. Aniline forms benzanilide on treatment with benzoyl chloride in 10 % NaOH.

Haloform reaction

Haloform reaction

Aldehydes and ketones having at least one methyl group linked to the carbonyl carbon atom (methyl ketones) and secondary methyl carbinols with halogen are oxidised by sodium hypohalite to sodium salts of corresponding carboxylic acids having one carbon atom less than that of carbonyl compound. The methyl group is converted to haloform. This oxidation does not affect a carbon-carbon double bond, if present in the molecule.
Haloform reaction is specific for methyl ketones and alcohols oxidisable to methyl ketones .Thus haloform reaction constitutes a classical test for methyl ketones and methyl carbinols.

Haloform reaction

The reaction is carried out by dissolving  the compound in dioxane and first adding dilute sodium hydroxide and then a slight excess of iodine in potassium iodide solution.this is the followed by slight warming and finally adding water. If the compound contains the acetyl group , iodoform is precipitated out. when a ketone is treated with sodium hypoiodite solution , iodoform and sodium salt of carboxylic acid is formed.

Mechanism of Haloform reaction

Haloform reaction

Some Other Important Reactions