in methanol; diethyl ether ligand was added to soln. of Ni complex with stirring; stirring at roomtemp. for 12 h; evapn., filtration, washing with aq. NaOH, Et2O; recrystn. (CH2Cl2), drying in vac.;

potassium hydroxide; hydrogen bromide; (ethylenedinitrilo)tetraacetic acid trisodium salt 1.) MeCN, reflux, 1.5 h, 2.) H2O, room temp., 1 h; Multistep reaction;

hydrogen bromide 1.) MeCN, reflux, 1.5 h, 2.) CHCl3, H2O, 1 h; Multistep reaction;