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 H(2)NDipp 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.