Double 1,2‐Carbon Migration at Mixed Heavier Sn=Ge Vinylidenes

Abstract

Abstract1,2‐migration is one recurring isomerization reaction in organic chemistry. In contrast, double 1,2‐migration remains rare and limited to transition‐metal complexes. Herein, we describe the synthesis, characterization and reactivity of mixed heavier Sn=Ge vinylidenes. Double 1,2‐carbon migration enables the isomerization of the stannagermenylidene (3) to the germastannenylidene (4). X‐ray diffraction analysis and DFT calculations revealed that 3 and 4 feature a Sn=Ge double bond. The reaction of 3 with IMe4 (1,3,4,5‐tetramethylimidazoline‐2‐ylidene) results in the electron redistribution in the Sn=Ge core to give the germylone‐stannylene adduct (5). Moreover, treatment of 3 with 0.25 equiv. of (AlCp*)4 produces the heteronuclear aluminyl stannagermyne (6).