Trifluoroacetic acid → HCID 21438364, compound

Participants

Reaction Steps

A solution of 3.29 g. of 1-methyl-4-(2-trifluoromethylthio-9-hydroxythioxanthen-9yl)piperidine in 15 ml. of trifluoroacetic anhydride and 30 ml. of trifluoroacetic acid is stirred and refluxed for 2.5 hours. The solution is evaporated to dryness. The residue is dissolved in benzene and is washed with 10% sodium hydroxide to make the free base form. The benzene is washed with water, dried over magnesium sulfate, filtered, and the benzene is removed on a rotary evaporator. The residue is recrystallized from acetonitrile to give 1-methyl-4-[2-(trifluoromethylthio)thioxanthen-9-ylidene]piperidine, m.p. 104°-106° C.

Provenance & Evidence