| 摘要 |
NEW MATERIAL:An N-substituted-3,4,5,6-tetrahydrophthalamic acid derivative shown by the formula I (R1 is H, or halogen; R2 is halogen; R3 is H, or lower alkyl; R4 is H, or 1-8C alkyl; Z is 1-4C alkoxy-1-6C alkylamino). EXAMPLE:N-2-Methoxyethyl-N'- ( 4-chloro-2-fluoro-5-isopropoxy-carbonylphenyl )- 3,4,5,6-tetrahydrophathalamide. USE:A herbicide. Showing improved herbicidal effect on annual or perennial weeds with a small application amount of the herbicide. Having low phytotoxicity to crops. PREPARATION:A 3,4,5,6-tetrahydrophthalic anhydride shown by the formula II is reacted with a meta-aminobenzoic acid shown by the formula III or its ester in a solvent to give a compound shown by the formula IV, which is reacted with a dehydrating agent, and with an amine shown by the formula R5-NH2 (R5 is alkoxyalkyl), to give a compound shown by the formula I .
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