| 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 <IMAGE> 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: <IMAGE> in which R1 represents an optionally halogenated alkyl radical or an optionally substituted aryl radical, R2 represents a cyano or amidocarbonyl radical and X represents a halogen atom.
|
