反应详情

A mixture of 171.2 parts of ethyl 4-oxo-1-piperidinecarboxylate, 159.5 parts of 4-chlorobenzeneamine, 1520 parts of anhydrous methylbenzene and a few crystals of 4-methylbenzenesulfonic acid is stirred and refluxed for 7 hours. (The reaction vessel is provided with a reflux-condensor and water-separator). The methylbenzene is evaporated and the oily residue is distilled in vacuo, yielding 192 parts of oily ethyl 4-[(4-chlorophenyl)imino]-1-piperidine-carboxylate; bp. 171°-176° C. at 0.4 mm. pressure.

1. temperaturerefluxed for 7 hours
2. custom(The reaction vessel is provided with
3. temperaturea reflux-condensor
4. customThe methylbenzene is evaporated
5. distillationthe oily residue is distilled in vacuo