For further comparison of stabilizing coordination motifs, the all nitrogen coordinating 2-dimethylaminoethane-1-(tertbutylamido)alane (7, [Al(N t Bu)CH2CH2(NMe2)H2]), previously reported by Blakeney et al., )H2]) was synthesized. However, this compound readily decomposes, resulting in significantly lowered yields and degradation of the complex over time, forming a brittle foam under H2 release (figure_SI 2). Compounds 7 -9, were synthesized reacting the respective diamine with in situ prepared AlH3 38 as described by Blakeney et al. While 7 could be isolated spectroscopically pure in high yields of 92 %, 8 was isolated in a significantly lower yield of 41 %, while yields of 9 are unreliable due to limited stability and mixture of product and decomposition by-product.