Reactivity of Distibanes toward Trialkylalanes and -gallanes: Syntheses and X-ray Structures of Bisadducts and Heterocycles

Reactions between distibanes of the type Sb 2 R 4 and trialkylalanes and -gallanes R‘ 3 M in 1:2 stoichiometry yield eight bisadducts of the type [Sb 2 R 4 ][MR‘ 3 ] 2 (R = Me, R‘ = t -Bu, M = Al 1, Ga 2; R = Et, M = Al, R‘ = Me 3, Et 4, t -Bu 5; M = Ga, R‘ = Me 6, Et 7, t -Bu 8 ), which were characterized by multinuclear NMR studies and elemental analysis. In addition, 1, 2, 5, and 8 are the first structurally characterized neutral main group Lewis acid−distibane bisadducts. 1 − 8 are unstable in solution toward the formation of heterocycles of the type [R 2 SbMR‘ 2 ] x . [Me 2 SbGa( t -Bu) 2 ] 3 ( 9 ) and [Et 2 SbGa( t -Bu) 2 ] 2 ( 10 ) have been isolated and their solid state structures determined by single-crystal X-ray diffraction.