Novel aromatic systems. Part IX. Synthesis and substitutions of dibenzo[b,f]azepin-2-one

Dibenzo[b,f]azepin-2-one has been prepared and its reactions have been studied. Mononitro- and halogeno-derivatives were prepared by substitution reactions and their structures elucidated by n.m.r. spectroscopy, which showed that substitution had taken place in accordance with predictions made from calculations.