Trimethylaluminum Activates Zeolite-Confined Lanthanum Borohydrides to Enhance Catalytic C-H Borylation.

ABSTRACT: AlMe₃-treatment of the borylation precatalyst La(BH₄)₂(THF)_2.5-Ph₃Si-HY₃₀ affords La(BH₄)₂(AlMe₃)-Ph₃Si-HY₃₀, which is the superior lanthanum-based precatalyst for benzene borylation with pinacolborane (HBpin), giving higher turnovers (>285) and improved yields (up to 42%) of phenylpinacolborane (PhBpin). Solid-state NMR spectroscopy, X-ray adsorption spectroscopy, and theoretical studies characterized the precatalytic sites in La(BH₄)₂(AlMe₃)-Ph₃Si-HY₃₀ as κ²-O,O-{≡SiO(=Al)≡SiO}La(BH₄)₂(AlMe₃), revealing that AlMe₃ had displaced the THF ligands. In

SUBMITTER: Li Y 

PROVIDER: S-EPMC12007006 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature