Umsetzungen von Ga 2 Br 4 · 2 Dioxan mit (Trimethylsilyl)methyllithium und Neopentyllithium – Synthese und Kristallstruktur von Lithiumtetraalkylgallanaten(III) mit Li–C–Ga‐Brücke

Reactions of Ga 2 Br 4 · 2 Dioxane with (Trimethylsilyl)methyllithium and Neopentyllithium — Synthesis and Molecular Structure of Lithium Tetraalkylgallanates(III) with Li–C–Ga Bridges Ga 2 Br 4 · 2 dioxane reacts with (trimethylsilyl)methyllithium or neopentyllithium to yield in n ‐pentane/diethyl ether solution besides elemental gallium exclusively the disproportionation product trialkylgallane. In pure n ‐pentane the dioxane adducts of the corresponding lithium tetraalkylgallantes (R = CH 2 SiMe 3 2 ; R = CH 2 CMe 3 4 ) are formed. 2 and 4 are also synthesized by the reaction of GaBr 3 with alkyl lithium in the molar ratio 1:4. The crystal structure of 2 shows a dioxane‐bridged dimer and Li–C–Ga bridges with lithium probably bound by the C–H s̀‐bonds of the central carbon atoms.