SYNTHESIS OF ISOBUTYL 2,4-DINITROPHENYL SULPHONE

• Dissolve 340 mg of Isobutyl 2,4-dinitrophenyl sulphide in 10 ml of acetic acid, warm to about 50 °C and add dropwise 8 ml of 3 per cent aqueous potassium permanganate solution. 

• Maintain the solution at about 50 °C for 20 minutes, and then pass through the solution a stream of sulphur dioxide to decompose excess potassium permanganate. 

• Add crushed ice to the yellow solution to precipitate the crude sulphone. 

• Filter the precipitate, dry and recrystallise from rectified spirit to give the yellow crystalline product, m.p. 105-106 °C; the yield is 190 mg (50%).