| 摘要 |
A herbicidal composition which comprises a carrier and, as active ingredient, a compound of the general formula I or where possible, an acid addition salt thereof:
<CHEM>
in which Y represents a sulphur, selenium or tellurium atom; R<1> and R<2> each independently represents an optionally substituted alkyl or aryl group or an alkoxycarbonyl group, or R<1> and R<2> together represent an alkylene linkage or an alkylene linkage containing a heteroatom in the chain, each linkage being optionally substituted with one or more alkyl groups or phenyl groups or an alkoxy substituted phenyl group, a benzyl group, an acyl group, a pyridyl group or a furyl group with the proviso that when the heteroatom is sulphur it is optionally present in an oxidized form; X represents an oxygen atom and in addition when Y represents a sulphur atom X optionally represents a sulphur atom. Also within the scope of the invention are certain novel compounds according to general formula I and a method of combatting undesired plant growth at a locus.
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