Reaction CLI.—Action of Polysulphates on certain Hydrocarbons

SOaH group may be introduced in certain cases by the use of potassium trihydrogen disulphate, KH SO, or sodium pyrosulphate, Na2S207. 

20 gms. of benzene and 50 gms. potassium polysulphate are heated under a reflux until all the benzene has dissolved. The cold product is dissolved in water and neutralised with milk of lime and isolated as before. 

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