| 摘要 |
Pyrazoles useful as herbicides have the formula <CHEM> wherein R<1> is C1-C4 haloalkyl or ROR<5>, wherein R is C1-C2 alkylene or C2 alkylidene and R<5> is hydrogen, C1-C4 alkyl, C2-C5 alkanoyl, aroyl, C8-C10 aralkanoyl, C7-C9 aralkyl, phenyl, or phenyl substituted with C1-C4 alkyl, C1-C4 alkoxy, trihalomethyl, hydroxy, cyano or nitro; or benzoyl substituted with halogen, C1-C4 alkyl, C1-C4 alkoxy, trihalomethyl hydroxy, cyano or nitro; R<2> is C1-C4 alkyl, C5-C6 cycloalkyl, C7-C9 aralkyl, C7-C9 alkaryl, phenyl, naphthyl or a 5- or 6- membered heterocyclic group containing oxygen, sulfur or nitrogen, or R2 is phenyl substituted with halogen, trihalomethyl, C1-C4 alkoxy, hydroxy or cyano; Y is oxygen or sulfur, R<3> is C1-C4 alkyl, C2-C4 alkenyl, C3-C4 alkynyl, C2-C6 alkoxyalkyl or C2-C6 alkylthioalkyl; R<4> is hydrogen, C1-C4 alkyl or trihalomethyl; provided that R<2> is not 3,4-dialkylphenyl or 3,4 dihalophenyl. Compositions including the above pyrazoles used as preemergence and postemergence treatment of weeds are also described. |
