On Attempted Oxidative Cyclisation of IsomericN,N'-Diphenylphenylenediamines and TheirN,N'-Dimethyl Derivatives by Palladium(II) Acetate and Uv Light

The cyclisation of N,N'-diphenyl-o-, m- and p-phenylenediamines and their N,N'-dimethyl derivatives by palladium(II) acetate and UV light separately led to both bis-cyclisation, furnishing indolocarbazoles, and mono-cyclisations with cleavage as well as retention of one substituent, producing substituted carbazoles.