The reactions of bis(2,2,6,6-tetramethylpiperidino)aluminum bromide (tmp2AlBr) with Me3SiN3 or Me3SiCN lead to trimeric tmp2AlN3 and tmp2AlCN, respectively, while the reaction with Me3SiOCN produces the bicyclic compound [tmpCON(SiMe3)2]2′ , 3. Similarly, di(tertbutyl) aluminum bromide reacts with Me3SiCN to give tetrameric (Me3C)2AlCN, 4. The compounds (Me3C)2AlN3 and (Me3C)2AlOCN, obtained as oily products, have tetracoordinated Al atoms as shown by NMR spectroscopy, but the degree of oligomerization has not been determined.