Unusual Inorganic Ring Systems of Scandium and Yttrium Containing Group 13 Metals:  Coordination of Monomeric Me<sub>2</sub>InOMe to Yttrium<sup>†</sup>

Novel transformations of lanthanide(III) disiloxanediolates with group 13 metal trialkyls are reported. Treatment of the scandium metallacrown complex [{(Ph<sub>2</sub>SiO)<sub>2</sub>O}<sub>2</sub>{Li(DME)}<sub>2</sub>]ScCl·THF (<b>1</b>) with AlMe<sub>3</sub> resulted in an Li−Al exchange reaction and the formation of the heterotrimetallic inorganic ring system [{(Ph<sub>2</sub>SiO)<sub>2</sub>O}<sub>2</sub>{Li(THF)<sub>2</sub>}AlMe<sub>2</sub>]ScCl·THF (<b>2</b>). The related yttrium metallacrown [{(Ph<sub>2</sub>SiO)<sub>2</sub>O}<sub>2</sub>{Li(THF)<sub>2</sub>}<sub>2</sub>]YCl·THF (<b>3</b>) reacts with InMe<sub>3</sub> under the formation of the heterobimetallic Y/In disiloxanediolate complex [{(Ph<sub>2</sub>SiO)<sub>2</sub>O}<sub>2</sub>{InMe<sub>2</sub>(OMe)}<sub>2</sub>InMe<sub>2</sub>]Y (<b>4</b>). In the latter, two monomeric Me<sub>2</sub>InOMe ligands are stabilized through coordination to yttrium.