The condensation of [NiL1(HL1]– [H2L1=2-(hydroxyimino)propanamide] with formaldehyde and methylamine in methanol soloution yields a stable anionic complex based on a tetradentate open-chain ligand and represents the first example of a ring-closure reaction featuring the co-ordinated amide groups.
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Igor O. Fritsky (1999) studied this question.
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