Dinuclear Chlorotetrylenes of Silicon, Germanium, and Tin Based on a Backbone-Bridged Bis(amidine)

Abstract

Bis(chlorotetrylene)s of Si, Ge, and Sn have been synthetically realized starting from the backbone-bridged bis(amidine) 1. Double deprotonation of 1 and subsequent reaction with trichlorosilane affords the bis(dichorosilane) 2, which is converted to the respective bis(chlorosilylene) 3 by dehydrochlorination using lithium bis(trimethylsilyl)amide. The related bis(chlorogermylene) 4 and the bis(chlorostannylene) 5 are obtained by reacting the dilithium salt with GeCl2 ⋅ (dioxane) and SnCl2, respectively. 2 readily reacts with benzil affording the bis(siladioxolene) 6, while no reaction was observed when using the bis(chlorogermylene) 4. The complexes have been fully characterized and their molecular solid-state structures have been investigated by means of single-crystal X-ray diffraction analysis.