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Umpolung at Boron: Ancillary‐Ligand‐Induced Formation of Boron‐Based Donor Ligands from Phosphine‐Boranes
Author(s) -
Vondung Lisa,
Alig Lukas,
Ballmann Monika,
Langer Robert
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201705847
Subject(s) - umpolung , chemistry , boranes , ligand (biochemistry) , borane , phosphine , boron , protonation , hydride , phosphine oxide , medicinal chemistry , lewis acids and bases , pincer ligand , frustrated lewis pair , reactivity (psychology) , photochemistry , polymer chemistry , organic chemistry , pincer movement , hydrogen , catalysis , medicine , ion , biochemistry , receptor , alternative medicine , pathology , nucleophile
Easy‐to‐prepare η 2 ‐coordinated phosphine‐borane ligands are demonstrated to liberate hydrogen upon treatment with different σ‐donor/π‐acceptor ligands (CO, t BuNC, 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.