Abstract
The metal-substituted silylenes are of high interest, as the theoretical studies indicated that the silylenes with electropositive substituents have a small ΔES−T (singlet-triplet energy gap) or even the ground-state triplets. However, such compounds are highly unstable, and only two transient alkali metal-substituted silylenes M(tBu3Si)Si: (M = Li, K) were generated by photoextrusion of the alkali metal-substituted silacyclopropenes and merely studied by spectroscopic method (EPR) at low temperature (14 to 50 K). Herein, we report the generation of transient zinc-substituted silylenes from zinc silacyclopropanyl complexes under very mild and convenient conditions. The generated transient zinc-substituted silylenes are highly reactive and undergo intermolecular cycloaddition with alkenes for the synthesis of zinc-substituted Si-heterocyclic compounds. If there is no substrate, the zinc-substituted silylenes attack the C-C bonds of the β-diketiminato ligands and break the C-C bonds. DFT studies further highlight the silylene nature of the zinc-substituted silylene and a very small ΔES−T (4.4 kcal/mol).
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21890721, 21732007) and the Shanghai Municipal Committee of Science and Technology. Laurent Maron is a senior member of the Institut Universitaire de France. Laurent Maron acknowledges the Chinese Academy of Sciences President’s International Fellowship Initiative. CalMip is finally acknowledged for a generous grant of computing time.
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Xu, C., Rajeshkumar, T., Maron, L. et al. Generation, bonding and reactivity of transient zinc-substituted silylenes. Sci. China Chem. 67, 1256–1262 (2024). https://doi.org/10.1007/s11426-023-1890-9
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DOI: https://doi.org/10.1007/s11426-023-1890-9