Cyclic sulphones five-membered ring

The observed reactivity sequence for aliphatic sulphonates closely resembles that for the corresponding aliphatic sulphates ethylene sulphate, trimethylene sulphate and dimethyl sulphate (12 1 6)127 for which S—O bond fission (14%) was again only observed for the hydrolysis of a five-membered cyclic sulphate. The heats of hydrolysis have, however, been measured for aliphatic sulphate esters and the existence of considerable ring strain in the five-membered system is indicated by the fact that the heat of hydrolysis of ethylene sulphate exceeds that of dimethyl sulphate by 5-6kcalmol-121. 

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