Ionic and Organometallic Reductions with N‐Heterocyclic Carbene Boranes

Surgical reduction: N-Heterocyclic carbene-borane complexes such as depicted are neutral, organic soluble analogues of borohydride anions with a weak hydridic character, compatible with organometallic catalysis. They are applicable for surgical reductions in complex, multifunctional molecules. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.