Hydrogen Bromide → 2-methyl-4-(1-methyl-5-trifluoromethyl-1H-pyrazol-3-yl)-phenol

Participants

Reaction Steps

A mixture of 3-(4-methoxy-3-methyl-phenyl)-1-methyl-5-trifluoromethyl-1H-pyrazole (described in Reference Preparation example 78) 0.4 g, 47% hydrobromic acid 24 ml and acetic acid 24 ml was stirred with heating under reflux for twelve hours. The solvent was distilled off and to the resulting residues was added ice water 70 ml. The precipitates were filtered and were washed with ice water 70 ml, and then were concentrated under, reduced pressure to give 2-methyl-4-(1-methyl-5-trifluoromethyl-1H-pyrazol-3-yl)-phenol 2 g.

Provenance & Evidence