[Na].[C:2]([NH:4][C:5]([CH:9]1[CH2:11][CH2:10]1)=[N:6][C:7]#[N:8])#[N:3].[ClH:12].CCCCCC>CC(=O)CC>[NH2:8][C:7]1[N:3]=[C:2]([Cl:12])[N:4]=[C:5]([CH:9]2[CH2:11][CH2:10]2)[N:6]=133 g of the sodium salt of N,N'-dicyano-cyclopropanecarbamidine (crude product) is suspended in 100 ml butanone. A solution of 20 g HCl in 400 ml butanone is dropped under stirring into this solution at 10° C. After the addition has been completed it is stirred for 1 h at ambient temperature. The reaction mixture is concentrated by evaporation and 200 ml of saturated aqueous NaHCO3 -solution and 300 ml diethylether are added. The organic phase is separated, washed, dried and concentrated by evaporation. One isolates 21 g of crude product which is treated with hexane to leave the pure title product.
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