Novel aluminium- and gallium-nitrogen heteronorbornanes

Selective formation of 2,5-dialumina-3,6-diaza- and 2,5-digalla-3,6-diaza-n orbornane is achieved by reaction of bis(lithiomethyl-methylamino)methane w ith dimethylaluminium and dimethylgallium chloride by simultaneous formatio n of two metal-carbon and two metal-nitrogen bonds accompanied by two ring closure reactions; the norbornane-basket structures are favoured over poten tial isomers containing three-membered rings and over polymeric aggregation .