Azo Dyes & Amines Flashcards
0
Q
What happens to the NO2 group on Nitrobenzene after reduction?
A
Nitrobenzene is reduced to make Phenylamine (Aniline)
⭕️-NO2 + 6[H] ▶️ ⭕️-NH2 + 2H2O
1
Q
What is used to REDUCE Nitrobenzene?
A
A mixture of
Tin & Hydrochloric Acid
Heated under Reflux
These are the reducing agents.
2
Q
What are the two steps for the preparation of dye stuffs?
A
Diazotisation and Coupling reactions.
3
Q
What is meant by the term Diazotisation?
A
Diazotisation is responsible for the formation of the DIAZONIUM ION (N+=N)
Add Nitrous Acid (below 10*C) and a DIAZONIUM SALT will form.
