1: With {1,3-bis[2,6-di(propan-2-yl)phenyl]-1,3-dihydro-2H-imidazol-2-ylidene}AuCl; silver trifluoromethanesulfonate in N,N-dimethyl-formamide T=20°C; 5 h; Inert atmosphere; 2: With water in N,N-dimethyl-formamide regioselective reaction;