1: With [{Au(1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene)}2(μ-OH)][BF4] in water; butanone T=60°C; Meyer-Schuster-like rearrangement; 12 h; 2: With iodine in dichloromethane T=20°C; 2 h;