| 摘要 |
Hetero-substituted pyrid-4-one derivatives of the general formula <IMAGE> (I) in which R1 represents an optionally substituted phenyl radical, R2 represents an alkyl, alkenyl, alkinyl, alkoxy, alkoxyalkyl or dialkylamino radical, and R3 and R4, together with the nitrogen atom to which they are bonded, represent an optionally substituted heterocyclic radical, are novel, are produced as described and find use as herbicides, especially as selective herbicides for combating graminaceous weeds in crops such as cotton, wheat, soy beans and corn.
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