Chiral polymetallic complex

We developed various catalytic enantioselective cyanation and azidation reactions using chiral poly rare earth metal (RE) complexes derived from ligands 5-8 and TMSCN or TMSN3 as a stoichiometric nucleophile [43, 44]. General mechanism for those asymmetric catalyses is shown in Scheme 11. First, polymetallic complexes 9 containing defined higher order strucmres are generated via a reaction... 

Some metallodendrimers with one or more stereogenic centers have been prepared without control of the chirality. Vogtle and Balzani [74] have tried several strategies to prepare dendrimers in which a ruthenium cation is the core of the final compound. In these compounds, the only centre of chirality is that of the metal, but as it was not controlled racemic mixtures were obtained. Controlling the stereochemistry of the starting complex would have allowed the authors to prepare a optically pure metallodendrimer. Denti, Campagna, Balzani, and their co-workers have studied polymetallic dendrimers based on bipyridine and 2,3- 7s -(2-pyridyl)pyrazine (2,3-... 

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