| 摘要 |
A compound of formula (I):or a salt, enamine or the like, acylate, sulphonate, carbamate or ether derivative thereof; wherein X, X1 and X2 are independently oxygen or sulphur, R1 is an optionally substituted heterocyclic or cycloalkyl group, and Y is an optionally substituted C2-C4 alkylene group which is optionally interposed by an oxygen atom, a groupa groupor an optionally mono-substituted nitrogen atom, wherein p is 0, 1 or 2, s is 0 or 1 and Rb is alkyl or alkoxy; provided that when X, X1 and X2 are oxygen, R1 is not pyridyl or pyrimidinyl. Processes for the preparation of these compounds and herbicidal compositions containing them are also described and claimed.
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