| 摘要 |
NEW MATERIAL:A compound shown by the formula I [R is H, alkynyl, alpha-substituted benzyl, phenacyl, COR<1>(R<1> is lower alkyl, lower alkoxy, substituted or unsubstituted cycloalkyl or alkenyl), SO2R<2>(R<2> is lower alkyl, alkenyl, or substituted phenyl); X is O, S, SO, or SO2; Y is H, halogen, or OCHF2]. EXAMPLE:4-o-Difluoromethoxybenzoyl-1,3-dimethyl-5-hydroxypyrazole. USE:Having strongly herbicidal effect with a small amount of agent used, an insecticide, fungicide or herbicide effective for controlling noxious insects such as Nilaparvata lugens, citrus red mite, etc., blights such as blast of rice plant, etc. PREPARATION:1,3-Dimethyl-5-pyrazolone is reacted with a compound shown by the formula IV (Z1 is OH, or halogen) to give a compound shown by the formula III, and, if necessary, this compound is reacted with a compound shown by the formula II (Z is halogen) to give a compound shown by the formula I .
|
