In the reaction of N-arylmethylene-2-aminofluoren-9-ones with acetophenone
under various conditions were obtained both intermediate aminodiketones and
the cyclization products thereof,2-aryl-4phenyl-10H-indeno[1,2-g]quinolin-
10-ones. Indenoquinolinones were also obtained by cyclization of aminodiket
ones.