Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202202176
Keywords
Aluminum; Dehydropolymerization; Metal-Ligand Cooperativity; Polymers; Polyphosphinoboranes
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Funding
- Alexander von Humboldt foundation
- Studienstiftung des deutschen Volkes
- Friedrich-Ebert Foundation (FES)
- NSERC
- Government of Canada
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [948708]
- Projekt DEAL
- European Research Council (ERC) [948708] Funding Source: European Research Council (ERC)
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This study developed a transition metal-free catalyst for the preparation of high molar weight polyphosphinoboranes, overcoming the interference of transition metal impurities on the reproducibility of material properties.
High molar weight polyphosphinoboranes represent materials with auspicious properties, but their preparation requires transition metal-based catalysts. Here, calix[4]pyrrolato aluminate is shown to induce the dehydropolymerization of phosphine boranes to high molar mass polyphosphinoboranes (up to M-n=43 000 Da). Combined GPC and P-31 DOSY NMR spectroscopic analyses, quantum chemical computations, and stoichiometric reactions disclose a P-H bond activation by the cooperative action of the square-planar aluminate and the electron-rich ligand framework. This first transition metal-free catalyst for P-B dehydrocoupling overcomes the problem of residual d-block metal impurities in the resulting polymers that might interfere with the reproducibility of the properties for this emerging class of inorganic materials.
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