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A Stabilized Bisphosphanylsilylene and Its Heavier Congeners
Denis Kargin1, Zsolt Kelemen1,2,3, Kristijan Krekić1
1Institut für Chemie und CINSaT, Universität Kassel, Heinrich Plett-Straße 40, 34132, Kassel, Germany.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 15, 2018
Summary
Novel bisphosphanylsilylene and heavier analogues were synthesized as donor adducts. These stable compounds exhibit electrophilic character, similar to boranes, offering new avenues in chemistry.
Area of Science:
- Organometallic Chemistry
- Main Group Chemistry
- Carbene Chemistry
Background:
- Bisphosphanylsilylenes are a class of low-valent silicon compounds.
- Ferrocenophanes provide unique structural scaffolds for main group element chemistry.
- N-heterocyclic carbenes (NHCs) are versatile ligands and stabilizing moieties.
Purpose of the Study:
- To synthesize and characterize bisphosphanylsilylene and its heavier analogues (stannylene, plumbylene) with a [3]ferrocenophane backbone.
- To investigate the structural, bonding, and stability aspects of these novel compounds.
- To explore the reactivity and electronic properties of the synthesized silylene adduct.
Main Methods:
- Dehydrochlorination for silylene formation.
- Cycloreversion reactions for stannylene and plumbylene synthesis.
- Isolation and characterization of N-heterocyclic carbene (NHC) adducts.
- Density Functional Theory (DFT) calculations for structural and electronic analysis.
Main Results:
- Successful synthesis of bisphosphanylsilylene, -stannylene, and -plumbylene as NHC donor adducts.
- Structural elucidation of the ferrocenophane-based compounds.
- DFT calculations confirmed the bonding and stability of the adducts.
- The silylene adduct demonstrated significant stability and electrophilic character comparable to boranes.
Conclusions:
- The [3]ferrocenophane backbone effectively stabilizes bisphosphanylsilylene and its heavier congeners.
- NHC adducts provide a viable route to access and handle these reactive low-valent main group species.
- The observed stability and reactivity profile of the silylene adduct opens possibilities for its application in synthesis and catalysis.
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