A 1,5-Oligosilanylene Dianion as Building Block for Oligosiloxane Containing Cages, Ferrocenophanes, and Cyclic Germylenes and Stannylenes

Starting out from dipotassium 1,5-oligosiloxanylene diide <b>2</b>, a 3,7,10-trioxa-octasilabicyclo[3.3.3]undecane was prepared, which represents the third known example of this cage structure type. Reaction of 1,3-dichlorotetramethyldisiloxane with 1,1&#8217;-bis[bis(trimethylsilyl)potassiosilyl]ferrocene gave a ferrocenophane with a disiloxane containg bridge. The compound can be further derivatized by conversion into a 1,5-oligosilanyl diide. Reacting 1,5-oligosiloxanylene diide <b>2</b> with SnCl₂ or GeCl₂&#183;dioxane in the presence of PMe₃ gave cyclic disilylated tetrylene PMe₃ adducts. Release of the base-free stannylene led to a dimerization process which gave a bicyclic distannene as the final product. Abstraction of the PMe₃ from the cyclic disilylated germylene PMe₃ adduct with B(C₆F₅)₃ caused oxidative addition of the germylene into a para-C-F bond of Me₃P&#183;B(C₆F₅)₃.

Abstract licence: CC BY

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