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The ligand system [R-NPR′2NPR′2N-R″]- has heen used to build up new heterocycles. When the substituents R and R″ are leaving groups such as hydrogen or trimethylsilyl (SiMe3), quasi aromatic metallacycles could be obtained upon reaction with metal halides or metal oxides.1 Group 13 metal alkyls have been shown to give cyclic chelates with R═R″═SiMq and R′═Ph or NM9. Group 2 and 12 N(SiMqh-substituted metals form spirocycles or cubes depending on the size of the metal and the ligand.2
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