SYNTHESIS OF SUBSTITUTED AMINOGALLANES BY ALKYLTRIMETHYLTIN ELIMINATION

Alkyltrimethyltin elimination reactions of R(3)Ga (R = Me, Et) with R '' R'NSnMe(3) (R '' = i-Bu, SnMe(3), C6H11 and R' = i-Bu, i-Pr, C6H11) have been investigated. The aminogallanes [Me(2)GaN(i-Bu)(2)](2), [Et (2)GaN(i-Bu)(2)](2), [Me(2)GaN(i-Pr)SnMe(3)](2), [Me(2)GaN(C6H11)(2)]( 2), and [Et(2)GaN(C6H11)(2)](2) were isolated in 88.6, 68.6, 69.1, 81. 0, and 80.4% yields, respectively. X-ray crystallographic studies of [ Et(2)GaN(i-Bu)(2)](2), [Me(2)GaN(i-Pr)SnMe(3)](2), [Me(2)GaN(C6H11)(2) ](2), and [Et(2)GaN(C6H11)(2)](2) indicate that the four aminogallanes are dimeric in the solid state. The four-membered (Ga-N)(2) rings in [Et(2)GaN(i-Bu)(2)](2) and [Et(2)GaN(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)degrees. All five aminogallanes exist as dimer s in benzene solutions. The H-1 and C-13 NMR spectra are reported and discussed.