Synthesis and Structural Characterization of Some Monomeric Group 13 Amides

Three monomeric, base-free tris(primary amido) compounds of the type E[N(H)Mes*]3 (1, E = Al; 2, E = Ga;
3, E = In; Mes* = 2,4,6-tri-tert-butylphenyl) have been synthesized via the salt elimination reaction of Mes*N(H)Li with ECl3. The singly base-stabilized tris(primary amido) derivatives, [E{N(H)Dipp}3(py)] (7, E = Al; 8,
E = Ga; Dipp = 2,6-diisopropylphenyl), have been prepared via the amine elimination reaction of H2NDipp with
[E(NMe2)3]2. The related indium compound, [In{N(H)Dipp}3(py)2] (9), which features two coordinated bases,
was prepared by treatment of DippN(H)Li with InCl3 followed by pyridine. The X-ray crystal structures of 3, 8,
and 9 have been determined.