Reactions of mental chelates. I. The reactions of copper (II) chelates of some beta-diketones and their related compounds with glycine, diglycine and triglycine.
The reactions of copper(II) chelates of β-diketones such as acetylacetone, benzoylacetone, dibenzoylmethane and benzoylacetaldehyde and of chelates of their related compounds such as salicylaldehyde and 2-hydroxyacetophenone with glycine or glycylglycine were investigated. Only bis(salicylaldehydato)copper(II) and bis(benzoylacetaldehydato)copper(II) reacted with glycine to form the respective glycinato-Schiff base complexes, whereas the other chelates did not react with glycine under the same condition. On the other hand, all the chelates except bis(dibenzoylmethanato)copper(II) reacted with glycylglycine to form the respective glycylglycinato-Schiff base complexes. The reaction at pH 4.5 between bis(salicylaldehydato)copper(II) and triglycine resulted in the hydrolytic cleavage of peptide bond, producing the salicylideneglycylglycinatocuprate(II) and free glycine. As the results of this investigation, five new copper(II) chelates were synthesized and characterized.
Reactions of Metal Chelates. III. The Reactions of Bis(salicylaldehydato)copper(II) with Amides and Esters of Glycine and Glycylglycine
The reactions of bis(salicylaldehydato)copper(II) in acidic, neutral and basic media with glycinamide, glycinester, glycylglycinamide and glycylglycinester have been systematically investigated. The reaction products have, in all cases, been isolated as crystals and characterized. As a result of this investigation, six new copper(II) chelates of Schiff bases derived from salicylaldehyde and glycine- or glycylglycine-amide have been obtained. The interrelation between those chelates has also been disclosed.
Achievements and contradictions of the Peruvian agrarian reform
Different paths of transition to capitalist agriculture, as well as different types of agrarian reform, can be distinguished. The Peruvian agrarian reform is analysed within this context and evaluated in terms of its contribution to rural development. The Peruvian case underlines the importance of understanding the rationality of the pre‐existent agrarian system for a successful restructuring of the agrarian economy and society. The contradictions which arose between the State's model and the peasants’ model of agrarian reform, as well as those between different types of peasants, are discussed. Peru's experience is also a reminder that a land reform is not a sufficient condition for rural development unless accompanied by proper price, marketing, credit and investment policies.