Formation of NHC-boryl radicals can be well regulated through the multi-site-modification of NHC-boranes, and the spin density of the radical boron center is a reasonable descriptor for properties and reactivities of these boron-based systems.
First electrochemical generation of NHC-boryl radicals for B–N bond formation. This sustainable method uses electrons as clean reagents, requires no radical initiators or photocatalysts, and enables scalable continuous-flow electrosynthesis.
In the absence of photoredox catalyst, we achieved radical borylation and lactonization of propargyl acetates under light irradiation using N-heterocyclic carbene borane, leading to the synthesis of substituted 4-(NHC-boryl)-2(5H)-furanones.
Mild conditions, no photocatalyst, broad substrate scope.
A versatile methodology enabling mono-, di-, and tri-functionalization of NHC-boranes has been developed via the decatungstate and thiol synergistic catalysis.