| 摘要 |
Disclosed herein are herbicidal pyridine compounds substituted at the 3- and/or 5-position with a carboxylic acid-derived heterocyclic moiety, as well as herbicidal compositions and use of these compounds. The compounds have the formula: <CHEM> wherein: R3 is selected from the group consisting of 4,5-dihydro-2-oxazolyl; 2-oxazolyl; 2-thiazolyl; 4,5-dihydro-2-thiazolyl; 5,6-dihydro-4H-1,3-oxazin-2-yl; 5,6-dihydro-4H-1,3-thiazin-2-yl; 4,5-dihydro-1H-imidazol-2-yl; 2-oxazolidinyl; 1,3,4-oxadiazol-2-yl; 4,5-dihydro-1,3,4-oxadiazol-2-yl; 1,3-dithiolan-2-yl, 1,3-dithian-2-yl,2-thiazolidinyl, 1,3-dioxolan-2-yl, 1,3-dioxan-2-yl, 1,3-oxathiolan-2-yl, 5-tetrazolyl, 5-oxazolyl, and the above mentioned heterocycles substituted with one or more substituents selected from lower alkyl, alkoxy and trifluoroacetyl, and 1-amino-4,5-dihydro-1H-imidazolyl; R4 is selected from C1-C4 straight or branched chain alkyl, C3-C4 cycloalkyl, cycloalkylalkyl, alkylthioalkyl, and bis(alkylthio)alkyl; R5 is the same as R3 or is <CHEM> - @-Z2 or -C IDENTICAL N where Z1 is O, S, or NR7 where R7 is lower alkyl, and Z2 is selected from alkoxy, alkenoxy, alkynoxy, alkylthio, pyrazolyl, haloalkoxy, cyanoalkoxy, chloro, and -NHR8 where R8 is lower alkyl; R2 and R6 are independently selected from fluorinated methyl, chlorofluorinated methyl, chlorinated methyl and lower alkyl, provided that one of R2 and R6 must be fluorinated or chlorofluorinated methyl; provided that R3 is not 4,5-dihydro-1-methyl-1H-imidazol-2-yl when R5 is methylthiocarbonyl, and R3 is not an unsubstituted 4,5-dihydro-1H-imidazol-2-yl when R5 is methoxycarbonyl. |
