| 摘要 |
NEW MATERIAL:A carbamate derivative expressed by formula I (R1 is halogen, lower alkenyl, lower alkoxy, lower alkylthio, lower alkylamino, hydroxy lower alkyl, halogenated lower alkyl, CN, NO2 or acyl; R2 is lower alkyl; R3 is H, halogen, lower alkyl, lower alkoxy or lower alkylamino; R4 is H or lower alkyl; X is O or S). EXAMPLE:4-Bromophenyl N-(6-methoxy-2-pyridyl) N methylcarbamate. USE:A herbicide. PREPARATION:A phenol derivative expressed by formula II (Y is H, halocarbonyl or halothiocarbonyl) is reacted with an aminopyridine derivative expressed by formula III (Z is halocarbonyl or halothiocarbonyl when Y is H and H when Y is halocarbonyl or halothiocarbonyl) to afford the aimed compound expressed by formula I .
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