2-(2-Ethoxy-2-phenyl-ethenyl)-1-pyrroline tetrafluoroborate → 2-[2-(Isopropylimino)-2-phenylethylidene]-pyrrolidine

Participants

Reaction Steps

By refluxing the solution of 9.1 g (0.03 mole) of 2-(2-ethoxy-2-phenyl-ethenyl)-1-pyrroline-tetrafluoroborate in 30 ml of isopropylamine for 1 hour and processing analogously to Example 1, there is obtained crude 2-[2-(isopropylimino)-2-phenylethylidene]-pyrrolidine. The crude base is dissolved in isopropanol, and 2.8 g of methanesulphonic acid is added, whereupon 2-[2-(isopropylimino)-2-phenyl-ethylidene]-pyrrolidine-(1:1)-methanesulphonate, m.p. 175°-176° (decomposition) crystallises out.

Provenance & Evidence