| 摘要 |
A method of treating an aqueous or non-aqueous dfsystem is disclosed which comprises adding to the system a thiolan of the formula <CHEM> wherein each of X and Y, which may be the same or different, represents fluorine, chlorine or bromine, in combination with a sulphone of the formula: R1 - SO2 CH = @ - R2 in which R1 represents an optionally halogenated alkyl radical or an optionally subsituted aryl radical, R2 represents a cyano of amidocarbonyl radical and X represents a halogen atom. |
