| 摘要 |
Picolinic acid derivs. of formula (I), useful as selective herbicides, are prepared. In (I), R is H, alkyl, alkenyl, alkynyl, alkylammonium, alkali metal, alkali earth methal, benzyl, alkoxycarbonylalkyl, hydroxyethyl, methylsulfonylmethyl; R1 and R2 are each halogen, lower alkyl, alkoxy or lower haloalkoxy; X is H, halogen or lower alkyl; E is methine or N; n is 0 or I.
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