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Updated: Feb 15, 2026

Negative Additive Manufacturing of Complex Shaped Boron Carbides
Published on: September 18, 2018
Umpolung at Boron: Ancillary-Ligand-Induced Formation of Boron-Based Donor Ligands from Phosphine-Boranes
Lisa Vondung1, Lukas Alig1, Monika Ballmann1
1Fachbereich Chemie, Philipps-Universität, Hans-Meerwein-Strasse 4, 35032, Marburg, Germany.
Abstract:
Easy-to-prepare η2 -coordinated phosphine-borane ligands are demonstrated to liberate hydrogen upon treatment with different σ-donor/π-acceptor ligands (CO, tBuNC, CN- ). Depending on the utilized ancillary ligand, different reaction pathways are observed, ranging from simple hydride protonation to iron-boron bond formation and subsequent rearrangement to pincer-type ligands based on a tricoordinate boron centre. The last-named reactivity is in line with a formal umpolung at the boron centre from a Lewis acidic borane to a Lewis basic boron-based donor ligand.
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