Diethyl Ether → 4-[3-[(Trifluoromethyl)thio]phenyl]-1-piperazinepropanenitrile

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Reaction Steps

N-(m-trifluoromethylthiophenyl)-piperazine (10.8 g, 0.047 g.mol.) and acrylonitrile (4.9 g, 0.094 g. mol.) are introduced into a 50 ml round bottomed flask provided with a stirrer and a reflux condenser. 0.1 ml of a 40% solution of benzyltrimethylammonium hydroxide in methyl alcohol is added with cooling and stirring. The mixture is allowed to stand at ambient temperature for 2 days and then heated for 2 hours to 80° C. After cooling, anhydrous diethyl ether (100 ml) is added to the reaction mixture, insoluble materials are filtered off, and the solution obtained evaporated on a water-bath in vacuo. The residue is fractionally distilled and N-(β-cyano-ethyl)-N'-(m-trifluoromethylthiophenyl)-piperazine (11 g, 88% yield) is thus obtained as a clear yellow viscous liquid, b.p. 198°-200°/3 mm Hg, nD23 = 1.5378.

Provenance & Evidence