Sulfuric Acid → HCID 136941909, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 1,4-dimethyl-3-(4-isopropoxy-3-methyl-phenyl)-5-methylthio-1H-pyrazole (described in Reference Preparation example 104) 8.9 g and 30% aqueous sulfuric acid solution 120 ml was stirred with heating under reflux for twenty hours. The reaction mixture was cooled to 0° C. and thereto was added ice water 50 ml. The resulting precipitates were filtered and were washed with cool water and hexane, and were concentrated under reduced pressure to give 4-(1,4-dimethyl-5-methylthio-1H-pyrazol-3-yl)-2-methyl-phenol 7.3 g.

Provenance & Evidence