Dehydrogenation of Pyrazoline and its Derivative using Dmso-I2-H2SO4 and Dmso-I2-System

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Pyrazoline was suspended in DMSO and a crystal of Iodine added to it. The mixture was refluxed for 1hr, cooled, diluted with water, the solid obtained was filtered, washed with 20% aqueous sodium thiosulphate and crystallised from ethanol to get pyrazoles. The same reaction was carried out in DMSO-I -H SO  system affords pyrazoles.

Thiosulphate; crystallised Pyrazoline filtered