preparation and reaction of diphenyl and triphenyl methane

1. Diphenyl methane

2. Friedel craft condensation of benzyl
chloride with benzene

7. Properties of diphenyl methane
• Crystalline solid
• Melting point 26 C
• Reactions similar to diphenyl
• Benzyl group is ortho para orientation

8. Hydrogen of the methylene group is
very active. Bromination gives rise to
substitution in methylene group not in
the phenyl ring

9. On nitration the nitro group enters
mainly 4th position and another nitro
group enters 4’ position.

10. When oxidised with chromic acid it
forms benzophenone

12. Triphenyl methane

13. Triphenyl methane Structure

14. Triphenyl methane properties
• Colourless crystalline solid.
• Melting point 93C
• It is parent substance for triphenyl methane
dyes.

15. Preparation of triphenyl
methane

16. Friedel craft condensation between
chloroform and three molecules of
benzene

17. Friedel craft condensation between
benzylidine chloride and two
molecules of benzene

18. It is prepared by condensing the
benzaldehyde with two molecule of
benzene in the presence of zinc
chloride

19. Phenyl magnesium bromide react with
benzophenone gives triphenyl
methanol

21. When ethyl benzoate react with
phenyl magnesium bromide

22. Triphenyl methane react with bromine
form triphenyl methyl bromide

23. Triphenyl methane on oxidation gives
triphenyl carbinol