2-bromopyridine N-oxide; {1,3-bis[2,6-di(propan-2-yl)phenyl]-1,3-dihydro-2H-imidazol-2-ylidene}AuCl; bis-(trifluoromethylsulphonyl)amine; AgNTf2 in 1,2-dichloro-ethane T=60°C; 21 h;