Darstellung und Struktur von Alkali‐penta‐tert‐butoxystannaten(IV)

Abstract

Preparation and Structure of Alkali Penta‐tert‐butoxystannates(IV)Potassium, rubidium, and caesium tert‐butoxide react with tin tetra‐tert‐butoxide in toluene to form compounds MSn(OtBu)5 [MK(2), Rb (3), Cs (4)] in contrast to lithium and sodium tert‐butoxide. The compounds 2–4 are soluble in non‐coordinating solvents and seem to be almost monomeric. 2 crystallizes as 2 · 1/2 toluene in the orthorhombic space group Fddd. The X‐ray structure determination shows 2 to be coordinated as a helical polymer with the tin atom in the center of a trigonal bipyramid of tert‐butoxide groups interlinked by two structurally different potassium atoms.