Beschreibung:
<jats:p> Isomeric azafluorenones have been oxidized to N-oxides with H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> in acetic acid or in the presence of Na<jats:sub>2</jats:sub>WO<jats:sub>4</jats:sub>.In the same manner monoazafluorenes have been converted into azafluorene N-oxides, but oxidation of diazafluorenes led first to diazafluorenones which then formed diazafluorenone N-oxides. Azafluorenones and azafluorenes are readily N-methylated with CH<jats:sub>3</jats:sub>I to give methiodides. The relations between the rate constants of N-methylation and structural factors have been discussed. </jats:p>