Abstract 2, 4-Dihydro-5-methyl-2-phenyl-4-(9H-thioxanthen-9-yl)-3H-pyrazol-3-one (3) was prepared by condensing 9H-thioxanthen-9-ol (1) with 2, 4-dihydro-5-methyl-2-phenyl-3H- pyrazol-3-one (2), or by cyclizing ethyl α-acetyl-9H-thioxanthene-9-acetate (4) with
