A number of unsymmetrical tetradentate Schiff base complexes of nickel(II) and copper(II) having only one methine carbon in the ligand were synthesized and characterized by means of UV and 1H NMR spectra. The kinetic studies of the electrophilic substitution reactions on the methine carbon with N-halogenosuccinimide gave no support to an aromatic character of the chelate ring, being consistent with the results of 1H NMR studies for the nickel(II) complexes.
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Kasuga et al. (1984) studied this question.
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