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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.
Shishkov et al. (Fri,) studied this question.
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