Cyclisation of N-(m-methoxybenzyl)-N-tosylanthraniloyl chloride with aluminium chloride at –20° yielded 5,6-dihydro-8-methoxy-5-tosyldibenz[b,e]azepine-11-one (70%), which could be detosylated with polyphosphoric acid. Some reactions of the dihydrodibenzazepinone system are described.