posted on 2009-06-22, 00:00authored byIgor V. Shishkov, Frank Rominger, Peter Hofmann
Employment of bidentate, anionic bis(3-tert-butylimidazol-2-ylidene)dialkylborate
N-heterocyclic ligands [BIMtBuBR2]− (R = Ph or Me) led to the isolation of two unprecedented lithium
carbene complexes: monomeric chelating [(BIMtBuBPh2)Li(OEt2)] (4a) and nonchelating,
dimeric μ2-κC2:κC2′-[(BIMtBuBMe2)2Li2] (4b). Both have been characterized
by spectroscopic methods and by single-crystal X-ray diffraction.