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The reaction of bis(lithiomethyl-methylamino)methane with ditbutylaluminium chloride leads to the formation of 3,3,6,6-tetra- t butyl-1,4-dimethyl-3,6-dialumina-1,4-diaza-norbornane by simultaneous formation of two metal-carbon and two metal nitrogen bonds accompanied by two ring closure reactions. The compound was identified by an NMR analysis ( 1 H,  13 C,  27 Al) and by determination of its crystal structure. Despite the high steric demand of the tbutyl groups, the norbornane-basket structure is favoured over potential isomers containing three-membered rings and over polymeric aggregation. The crystal structure of tri( t butyl)aluminium has been determined.  t Bu 3 Al crystallizes as a monomer, with the molecules interconnected by weak secondary Al···C contacts (2.95 Å) leading to a slight deviation of the AlC 3  units from a planar coordination geometry at the Al atoms

Synthesis and Structure of an Aluminium-Nitrogen Heteronorbornane with Bulky t Butyl Substituents and the Crystal Structure of Tri( t butyl)aluminium