http://www.arkat-usa.org/get-file/18680/

The behavior of 5H-dibenz[b,f]azepine dissolved in sulfuric acid 

When 5H-dibenz[b,f]azepine is dissolved in pure sulfuric acid it experiments an oxidative dismutation into two acridine derivatives: 9-formylacridine and 9,9'-ethene-1,2-diyl-bis-acridine.