Synthesis of Substituted Aminogallanes by Alkyltrimethyltin Elimination

Abstract

Alkyltrimethyltin elimination reactions of R3Ga (R = Me, Et) with R‘‘R‘NSnMe3 (R‘‘ = i-Bu, SnMe3, C6H11 and R‘ = i-Bu, i-Pr, C6H11) have been investigated. The aminogallanes [Me2GaN(i-Bu)2]2, [Et2GaN(i-Bu)2]2, [Me2GaN(i-Pr)SnMe3]2, [Me2GaN(C6H11)2]2, and [Et2GaN(C6H11)2]2 were isolated in 88.6, 68.6, 69.1, 81.0, and 80.4% yields, respectively. X-ray crystallographic studies of [Et2GaN(i-Bu)2]2, [Me2GaN(i-Pr)SnMe3]2, [Me2GaN(C6H11)2]2, and [Et2GaN(C6H11)2]2 indicate that the four aminogallanes are dimeric in the solid state. The four-membered (Ga−N)2 rings in [Et2GaN(i-Bu)2]2 and [Et2GaN(C6H11)2]2 (molecules 1 and 2) are nonplanar with fold angles on the Ga···Ga diagonals of 148.7(3) and 146.3(3), 147.7 (3)°. All five aminogallanes exist as dimers in benzene solutions. The 1H and 13C NMR spectra are reported and discussed.