Manufacturing Process
A mixture of 17.6 grams of p-n-butoxyacetophenone, 12.1 grams of piperidine
hydrochloride, 4.5 grams paraformaldehyde, 0.25 cc concentrated hydrochloric
acid, 52.5 cc nitroethane, 7.5 cc of 95% ethanol, and 15 cc of toluene was
boiled under reflux for one hour, removing water formed in the reaction by
means of a condensate trap. The mixture was then cooled. The crystals which
formed were collected by filtration, washed with anhydrous ether and
recrystallized from methyl ethyl ketone. The crystals thus obtained, which
melted at 174-175°C, were shown by analysis to be 4-n-butoxy-β-
piperidinopropiophenone hydrochloride.
