sodium hydroxide 4.5 h; Heating;

triethyl orthoformate; O2 in acetonitrile vac. line and Schlenk technique; soln. of Ni compd. in CH3CN was added dropwise to soln. of ligand and triethyl orthoformate in CH3CN; soln. waskept in presence of O2 for 3 d; filtered; solvent evapd.; elem. anal.;