Sulfuric Acid → 4-Chloro-3-(2,4-dichloro-5-formylphenyl)-5-difluoromethoxy-1-methyl-1H-pyrazole

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Reaction Steps

Analogously to Example 12, 45.5 g (91 mmol) of 3-(5-dibromomethyl-2,4-dichlorophenyl)-4-chloro-5-difluoromethoxy-1-methyl-1H-pyrazole were introduced into 65 ml of concentrated sulfuric acid. After working up, 20 g of the product were obtained. 1H-NMR (270 MHz, in CDCl3): δ [ppm]=10.41 (s,1H), 8.02 (s,1H), 7.65 (s,1H),6.77 (t,1H), 3.87 (s,3H).

Provenance & Evidence