| 摘要 |
4-Benzoyl-5-hydroxypyrazoles III (R=H, lower alkyl; X1,X2=H, halo) were prepd. By reacting I with II. Thus, 1g 1,3-dimethyl-5-pyrazolone was reacted with 2g 2,4-dichlorobenzotrichloride at 140≦̸C for 3 hrs. and treated with 11g KOH in 50% ethanol to give 22% 1,3-dimethyl-4-(2,4-dichlorobenzoyl)-5-hydroxypyrazole.
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