Synthesis of 2-nitro-4'-chlorobenzophenone was added in a 100 ml three-necked flask, and then slowly added just prepared sodium disulfide solution, heating and stirring to adjust the temperature controller, the temperature slowly rose to a certain temperature in 45 minutes, 90 constant temperature reaction for 3 hours, the endpoints were tested with dilute copper sulfate solution, filtration, washing to remove the residual sodium thiosulfate. The filter cake into a beaker, add about 90 ml of 95% ethanol, heating and boiling, while hot, filtration, filtrate in the beaker static natural crystallization, filtration of light yellow needle-like shiny crystals 2-amino-4'-chlorobenzophenone.
