Exploring the reactivity of sigma-EH compleplexes of electrophilic platinum systems
Salvador Conejero
| When |
30 Sep, 2022
from
11:00 am to 12:00 pm |
|---|---|
| Where | Room 3.20 |
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Title: Exploring the reactivity of sigma-EH compleplexesof electrophilic platinum systems
Speaker: Salvador Conejero
Abstract:
σ-EH complexes (E = Si, Ge and B) of transition metals are considered as arrested states en route to E-H bond scission, and have been frequently invoked as transient species in hydro-elementation reactions. In most cases, neutral transition metal compounds have been used to isolate and characterize structurally this usually reactive species, but cationic systems are very rare due to their inherent high reactivity. In this presentation we’ll show that highly electrophilic platinum(II) complexes stabilized by N-heterocyclic carbene ligands can interact with E-H bonds to form the corresponding σ-EH complexes. These compounds can be isolated in some cases and their structure has been analyzed by X-ray diffraction studies and computational methods. According to this, they can be considered to have a bonding situation that lies between η1- (only through the hydrogen atom) and η2-coordination modes. The interaction of the E-H bond with the platinum centre induces an enhancement of the electrophilic character of the “E” atom that has been leveraged in catalytic processes for the construction of Si-N, Si-O, Si,C and B-N bonds through mechanisms that do not involve classical oxidat.
