| 摘要 |
About 20 title compds. (I; R1 = lower alkyl, alkenyl; R2= lower alkyl; X = halogen, lower alkyl, alkoxy, nitro; n = 1-3) useful as herbicide, were prepd. by conversion of II in the presence of basic alkali metal salt or alkali earthmetal salt. Thus, 2.85 g 1,3-dimethyl-5-(2,4-dichlorobenzoyloxy)pyrazole and 2.5 g Na2CO3 were heated and stirred at 120-150oC, 30-60 min. 10 ml Isopropanol was added to the reactant and was heated for 60 min to give sodium1,3-dimethyl-4-(2,4-dichlorobenzoyl)-5-hydroxypyrazole.
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