Monomeric organogallium-nitrogen compounds.: Chemistry of Et2GaNH[C6H2(2,4,6-t-Bu)3] with decomposition to the metallacycle {EtGaNH[C6H2(4,6-t-Bu)2CMe2CH2-2]}2 and of EtGa{NH[C6H2(2,4,6-t-Bu)3]}2

Two monomeric gallium-nitrogen compounds, Et2GaNH[C6H2(2,4,6-t-Bu)(3)] and EtGa{NH[C6H2(2,4,6-t-Bu)(3)]}(2), have been prepared by metathetical reactions between either Et2GaCl or EtGaCl2, as appropriate, and LiNH[C6H2(2,4,6-t-Bu)(3)] and have been characterized fully. Cryoscopic molecular weight studies demonstrated both compounds to be monomeric in benzene solution, whereas an X-ray structural study of the latter identified a monomer. The compound Et2GaNH[C6H2(2,4,6-t-Bu)(3)] decomposes at room temperature to form a new metallacyclic derivative {EtGaNH[C6H2(4,6-t-BU)(2)(CMe2CH2-2)]}(2), GaEt3, and H2N[C6H2(2,4,6-t-Bu)(3)]. A H-1 NMR spectral study and an X-ray structural study were used to elucidate its structure. The compound EtG-a{NH[C6H2(2,4,6-t-BU)(3)]}(2) does not decompose to the metallacycle, but it reacts readily with GaEt3 to form Et2GaNH[C6H2(2,4,6-t-Bu)(3)].