1,3-diethyl-2-<3-(1,3-dihydro-3,3-dimethyl-1-ethyl-2H-indol-2-ylidene)-1-propenyl>-1H-naphth<2,3-d>imidazolium iodide 在
amberlite IRA-400 chloride ion-exchange resin 作用下,
反应 2.0h,
以88.2%的产率得到1,3-diethyl-2-<3-(1,3-dihydro-3,3-dimethyl-1-ethyl-2H-indol-2-ylidene)-1-propenyl>-1H-naphth<2,3-d>imidazolium chloride