Heavier group 2 (Mg, Ca) bis(trimethylsilyl)amides are catalysts for the formation of unsymmetrical diaminoboranes, [(R2N) BH(NR′2)], by dehydrocoupling of amine boranes and protic amines; a process which is proposed to occur by a sequential metal-centred elimination-insertion-elimination mechanism.
Bellham, P., Hill, M. S., Kociok-Kohn, G., & Liptrot, D. J. (2013). Bespoke synthesis of unsymmetrical diaminoboranes by alkaline earth catalysis. Chemical Communications, 49(19), 1960-1962. https://doi.org/10.1039/c3cc39072a