抄録
When 3-methoxy- and 3-hydroxy-6-chloropyridazine 1-oxides (Ia, b) were nitrated with nitric acid and concentrated sulfuric acid, mono-nitro compounds (IIa.b) were produced.(IIa) was shown as 4-nitro compound, (IIa) was converted to 3-methoxy-4, 6-dichloropyridazine 1-oxide (IV) with acetyl chloride. The reaction of (IIa) and (IV) with sodium methoxide occurred at their 4-positions respeetively.
