The 2-[(4 '-amino-3,3 '-dimethylbiphenyl-4-yl)amino]benzoic acid (II) was synthesized by Ullmann-Goldberg coupling by reaction of 3,3 '-dimethylbiphenyl-4,4 '-diamine (I) with 2chlorobenzoic acid. The compound (II) was cyclized by poly phosphoric acid (PPA) to give 2-[(4amino-3-methyl)phenyl]-4-methylacridin-9 (10H)-one (III). New Schiff bases (IVa-j) and (Va-d) has been prepared by reaction of compound (III) with aromatic aldehydes and cyclic ketones respectively.