Question

How to get 1,4 benzoquinone from aniline?

Answer 1

React it with `"K"_2"Cr"_2"O"_7"/H"_2"SO"_4`

Explanation:

You can oxidize aniline to 1,4- benzoquinone in one step (82 % yield) by oxidation with `"K"_2"Cr"_2"O"_7` in concentrated `"H"_2"SO"_4`

The 1,4-benzoquinone is isolated as yellow needles with a characteristic pungent odour.

The reaction presumably goes through intermediates such as 4-aminophenol

and quinoneimine