Sulfuric Acid → HCID 136941918, compound

Participants

Reaction Steps

A mixture of 4-chloro-3-(4-isopropoxy-3-methyl-phenyl)-5-methoxy-1-methyl-1H-pyrazole (described in Reference Preparation example 111) 5.6 g and 30% aqueous sulfuric acid solution 60 ml was stirred with heating under reflux for 20 hours. Thereto was added ice water 10 ml and the resulting mixture was extracted with ethyl acetate. The organic layer was washed with water, and was dried over anhydrous magnesium sulfate and was then concentrated under reduced pressure. The resulting residue was subjected to a silica gel column chromatography to give 4-(4-Chloro-5-methoxy-1-methyl-1H-pyrazol-3-yl)-2-methyl-phenol 1.2 g.

Provenance & Evidence