Magnesium, complex formation, application

In spite of much information available for the interactions of various metal ions with small oxoanions of phosphorus, relatively little information has been obtained for the complex formation of long-chain polyphosphate ion. This may be due to the fact that the conventional methods useful for the study of the complex formation of a relatively small ligand are not always applicable to the polyanion complex formation system. Since a gel chromatographic method based on the same principle as the equilibrium dialysis method has been proved to be applicable in the field of inorganic complex chemistry (1), this method has been applied to the study of the binding of long-chain polyphosphate ions to magnesium ion. 

The bis-prolinol-derived phenol (156) has been designed to facilitate the formation of heterodinuclear complexes based upon the large difference in pKH of the phenolic OH group and the tertiary OH groups. The first examples of its application involve hydroxyacetophenones (157) as donors in the asymmetric Michael addition to nitroalkene acceptors (158) the best stereocontrol was observed with a zinc- magnesium dinuclear complex, where enantiomeric excesses ranged up to 92% for the major anti diastereoisomer (159).212... 

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