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Aniline + (Sodium nitrate, HCl, water) ----> Diazonium Salt

Diazonium Salt + Water (protonated water, H3O+) -----> Phenol

Phenol + Zn (heat) -----> Benzene + ZnO

Benzene + Choloromethane (in the presence of Aluminium chloride) ----> Toluene + HCl

Toluene + Methanol ----> o-xylene + m-xylene + p-xylene 

p-xylene ----> Terepthalic acid (via Amoco process)


Amoco process -

p-xylene ---> p-tolubenzyl alcohol ---> p-tolualdehyde ---> p-toluic acid ---> p-carboxybenzyl alcohol ---> 4-carboxybenzaldehyde ---> Terephthalic acid


Intermmediate steps involve oxidation, catalysed by  Cobalt and Magnesium.


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