| 摘要 |
NEW MATERIAL:A compound shown by the formula I [X is halogen, NO2, lower alkyl, CF3, or SO2CH3; n is 1, 2, or 3; Z is (lower alkyl, lower alkenyl, or lower alkynyl) which may be replaced with halogen, CH2CN, group shown by the formula II, or organic acid residue; R is H or lower alkyl; m is 0 or 1; R' is phenyl or lower alkyl which may contain <=5 substituent groups (lower alkyl, halogen, NO2, or CF3)]. EXAMPLE:4-(2,4-Dichlorobenzoyl)-1-ethyl-5-benzyloxypyrazole. USE:A selective herbicide effective against weeds in a wide range, especially perennial weeds such as water nutgrass, etc., which are not controlled with ease with a well-known herbicide, having no phytotoxicity to paddy-rice plant at all, usable safety. PREPARATION:A compound shown by the formula III is reacted with a compound shown by the formula Hal-Z (Hal is halogen) to give a compound shown by the formula I.
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