Structural Characterization of a Boron(III) η2-σ-Silane-Complex

• DOI: 10.1021/jacs.9b03213
• Publication Date: 2019-04-30T11:27:00Z
• Authors: Yizhen Liu; Bo Su; Weishi Dong; Zhen Hua Li; Huadong Wang
• Keywords: Characterization; BORO

Coordination of H-E (E = H, C, Si, etc.) σ-bonds to unsaturated element centers, forming η2-σ-complexes, is a crucial step in bond activations which are involved numerous chemical transformations. Structural characterization σ-complexes has provided invaluable insight into the σ-bond activation process. While η2-σ-complexes low-oxidation-state transition metals have been isolated and thoroughly studied, those based on d0 or high-oxidation-state main group elements still remain elusive, despite their suggested role as key intermediates metathesis. Here we report synthesis highly electrophilic o-carboranyl-substituted hydroborenium its η2-σ-(H-Si)-complex, latter was characterized by X-ray analysis. Unlike previous known σ-(H-Si)-complexes back-donation contributes significantly stability, our computational studies revealed that no takes place between borenium silane moieties, factors for stability this silane-borenium complex (1) strong interaction empty p orbital boron center bonding σ H-Si (2) steric accessibility due presence hydrogen substituent.