ピロン誘導体の研究 (第5報)

デハイドロ酢酸モノイミドの銅キレートについて

抄録

Dehydroacetic acid monoimide reacts with cupric acetate in aqueous solution to form a copper chelate (DC-I). Such copper chelates are also formed by reaction with cupric chloride or sulfate. On the other hand, the product (DC-C) obtained by Collie by the addition of dehydroacetic acid to a mixture of conc. ammonia and cupric acetate seemed to have properties similar to those of the copper chelate (DC-I) obtained in the present series of experiments and therefore, comparative examination of these chelates was made. It was therefore found that (DC-C) is the same as the abovedescribed copper chelate (DC-I) and that they differ only in the amount of water of crystallization. The dried samples of (DC-I) and (DC-C) were identical.
The one interesting behavior of this copper chelate is that the co-existence of this copper chelate with dehydroacetic acid in a solution results in the formation of dehydroacetic acid-copper chelate while dehydroacetic acid imide-copper chelate changes into dehydroacetic acid-copper chelate, showing that the so-called ligand exchange reaction had taken place.