Hydrochloric Acid → Benzenesulfonic Acid

Participants

Reaction Steps

Claisen reaction of the commercially available p-methyl-acetophenone and trifluoroacetic acid ethyl ester gave 4,4,4-trifluoro-1-(4-methylphenyl)-butane-1,3-dione in good yield. The latter was further reacted with the commercially available p-hydrazino-benzenesulfonic acid in an inert solvent in the presence of hydrochloric acid to give the new 4-(5-p-methyl-phenyl)-3-trifluoromethyl-pyrazol-1-yl)-benzenesulfonic acid of formula (III) (yield over 80%),

Provenance & Evidence