4-(o-Nitrobenzylidene)-3, 5-dimethylisopyrazole (1) was converted to 1-acyl-4-(α-hydroxy-o-nitrobenzyl)-3, 5-dimethylpyrazoles (2, 3) or 3-(1'-acyl-3', 5'-dimethylpyrazolo)-5-chloroanthranils (6, 7) by treatment with acyl chlorides with or without pyridine.
