ChemistryCode 9701
Phenylamine and azo compounds
What this topic asks you to be able to do
- outline how phenylamine is made: benzene is nitrated to nitrobenzene, which is then reduced using hot Sn with concentrated HCl, and finally treated with NaOH(aq)
- outline: (a) what happens when phenylamine is combined with Br₂(aq) at room temperature (b) what happens when phenylamine is treated with HNO₂ or NaNO₂ and dilute acid below 10°C to yield the diazonium salt, and then how warming that diazonium salt with H₂O gives phenol
- outline and account for how aqueous ammonia, ethylamine and phenylamine rank against one another in base strength
- recall these points about azo compounds: (a) describe how benzenediazonium chloride couples with phenol in NaOH(aq) to give an azo compound (b) identify an azo group (c) state the frequent use of azo compounds as dyes (d) that further azo dyes may be made by a comparable route