u/Eastern_Bonus_7138

I'm studying pharmaceutical analysis and came across a qualitative test for amines using lead dioxide (PbO₂), but I can't find clear or detailed information about it anywhere.

Here's what I think I know:

- Aromatic primary amines are oxidized to give colored products

- Tertiary amines don't react, since there's no N-H bond available

My questions:

1. What is the exact mechanism of this oxidation?

2. Is the following balanced equation correct for a generic aromatic primary amine? → 2 ArNH₂ + PbO₂ → ArNH–NHAr + Pb(OH)₂

3. Do you know any reliable sources (textbooks, papers) where this test is described in detail?

Thanks in advance!