Acid-catalysed radical chain reaction of quinoneimine with hydroquinone

Trichloroacetic acid in as low concentrations as ∼10^–6 mol dm^–3 increased the rate of a chain reaction between N-phenyl-1,4-benzoquinonemonoimine and 2,5-di-tert-butylhydroquinone in chlorobenzene by a factor of 2 to 3.