11.Aromatic Ketones

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chemistry study materials 11

IUPAC name of acetophenone and benzophenone:

 Properties :

Colourless liquid, sparingly soluble in water readily soluble in ethanol and ether.

Uses :

Used as a hypnotic (sleep inducing) by name hypnone In perfumary.

Benzophenone : Diphenyl ketone C6H5– C- C6H5

Properties

  • It is a colourless, sweet smelling solid ( pt.323K)
  • It is insoluble in water but soluble in alcohol and ether.
  • Though it gives all reactions of carbonyl compound, it does not form addition product with sodium bisulphite because of steric hindrance and lowered reactivity due to the presence of two phenyl groups.
  • Oxidation with K2Cr2O7 and con. H 2SO4, it gives benzoic acid.
  • Reduction with sodium amalgam and water or lithium aluminium hydride, diphenylcarbinol is formed.
  • Diphenylcarbinol is also called ‘ benzhydrol’.
  • Reduction with zinc amalgam and con. HCl gives Diphenyl methane.
  • On fusion with potassium hydroxide, it undergoes disproportionation reaction.

Uses :

Benzophenone is used in perfumery and in the preparation of benzhydrel drop and diphenyl methane.

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