The tris-(tri-methyl-silylsiloxide) ligand, also known as hypersiloxide, is an extremely bulky group. In an attempt to make the monomeric Al(OSi(SiMe)), AlCl was combined with 3 equiv. of potassium hypersiloxide. The crystalline product isolated (40% yield), namely di-μ-chlorido-bis-[μ-tris-(tri-methyl-sil-yl)silanolato]tetra-kis-[tris-(tri-methyl-sil-yl)silanolato]dialuminium-dipotassium, [AlKCl(CHOSi)], is a KCl adduct of aluminium tris(hypersilyloxide) that is dimerized through a planar KCl ring, with K-Cl distances of 3.1131 (8) and 3.319 (3) Å, and ring angles of 77.41 (2) and 102.60 (2)°. This ring is on an inversion center, and there is no supra-molecular coordination.
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