“…Benzimidazolin-2-ylidenes as a class of NHC ligands are easily accessible from commercially available benzimidazole or o-phenylenediamine [40,41]. The preparation, structures, and reactions of benzannulated NHCs have been well studied by Hahn's group [42][43][44][45][46][47][48][49][50][51][52], however, compared to their imidazolylidene analogues, benzimidazolin-2-ylidenes complexes are less studied both in structural diversity and homogeneous catalysis [53][54][55][56][57]. Free benzimidazolin-2-ylidene usually forms dimeric complexes, thus the preparation of metal-benzimidazolin-2-ylidene complexes through Ag-benzimidazolin-2-ylidene transmetallation approach is convenient and practical.…”