反应详情

By heating the solution of 9.1 g (0.03 mole) of 2-(2-ethoxy-2-phenyl-ethenyl)-1-pyrroline-tetrafluoroborate in 25 ml of aniline for 1 hour at 80° and processing analogously to Example 1, there is obtained crude 2-[2-phenyl-2-(phenylimino)-ethylidene]-pyrrolidine. An addition of 2.8 g of methanesulphonic acid is made to a solution of the crude base in ethyl acetate and the resulting crystals are filtered off. The product thus obtained is 2-[phenyl-2-(phenylimino)-ethylidene]-pyrrolidine-(1:1)-methanesulphonate, m.p. 193°-194° (decomposition).