New Structural Motifs of Lithium N-Heterocyclic Carbene Complexes with Bis(3-tert-butylimidazol-2-ylidene)dialkylborate Ligands
摘要:
Employment of bidentate, anionic bis(3-tert-butylimidazol-2-ylidene)dialkylborate N-heterocyclic ligands [(BIMBR2)-B-tBu](-) (R = Ph or Me) led to the isolation of two unprecedented lithium carbene complexes: monomeric chelating [((BIMPh2)-Ph-tBu))Li(OEt2)] (4a) and nonchelating, dimeric mu(2)-kappa C-2:kappa C-2'-[((BIMBMe2)-B-tBu)(2)Li-2] 4b). Both have been characterized by spectroscopic methods and by single-crystal X-ray diffraction.
New Structural Motifs of Lithium N-Heterocyclic Carbene Complexes with Bis(3-tert-butylimidazol-2-ylidene)dialkylborate Ligands
摘要:
Employment of bidentate, anionic bis(3-tert-butylimidazol-2-ylidene)dialkylborate N-heterocyclic ligands [(BIMBR2)-B-tBu](-) (R = Ph or Me) led to the isolation of two unprecedented lithium carbene complexes: monomeric chelating [((BIMPh2)-Ph-tBu))Li(OEt2)] (4a) and nonchelating, dimeric mu(2)-kappa C-2:kappa C-2'-[((BIMBMe2)-B-tBu)(2)Li-2] 4b). Both have been characterized by spectroscopic methods and by single-crystal X-ray diffraction.