Complexes of Dichlorogermylene with Phosphine/Sulfoxide-Supported Carbone as Ligand

Abstract

Due to their remarkable electronic features, recent years have witnessed the emergence of carbones L2C, which consist in two donating L ligands coordinating a central carbon atom bearing two lone pairs. In this context, the phosphine/sulfoxide-supported carbone 4 exhibits a strong nucleophilic character, and here, we describe its ability to coordinate dichlorogermylene. Two original stable coordination complexes were obtained and fully characterized in solution and in the solid state by NMR spectroscopy and X-ray diffraction analysis, respectively. At 60 °C, in the presence of 4, the Ge(II)-complex 5 undergoes a slow isomerization that transforms the bis-ylide ligand into an yldiide.

New Insight into the Reactivity of S,S-Bis-ylide

“…Indeed, since the first synthesis of carbodiphosphoranes I by Ramirez in the 1960s [17], many models have been developed (Figure 1). Among them, we can mention carbodicarbenes II prepared by Bertrand's group [18], after initial theoretical predictions by Frenking [19]; mixed carbophosphinocarbene III, initially synthesized by Fürstner and Alcarazo and later by Ong et al [20][21][22]; and mixed phosphonio/sulfonio IV and phosphonio/sulfoxonio V (X = O) bis-ylides prepared by our group [23][24][25]. Finally, major contributions were made by Fujii's group with various combinations of selenium/sulfur-or sulfur/sulfur-stabilized carbones V-VIII [26][27][28][29][30].…”