American Chemical Society
om801097f_si_002.cif (87.86 kB)

New Structural Motifs of Lithium N-Heterocyclic Carbene Complexes with Bis(3-tert-butylimidazol-2-ylidene)dialkylborate Ligands

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posted on 2009-06-22, 00:00 authored by Igor 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 μ2C2C2-[(BIMtBuBMe2)2Li2] (4b). Both have been characterized by spectroscopic methods and by single-crystal X-ray diffraction.