1: carbon dioxide With [Au(1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene)hydroxide]; potassium hydroxide in tetrahydrofuran T=20°C; P=1125.11 Torr; 0.25 h; 2: 1,2,4,5-TeCB in tetrahydrofuran T=20°C; P=1125.11 Torr; 12 h; 3: With hydrogenchloride in tetrahydrofuran; water regioselective reaction;

dihydrogen peroxide in sulfuric acid; Calcium chloride; water

magnesium; ethylene dibromide 1.) THF, from 10 deg C to 15 deg C, 1 h, 2.) THF, 0.5 h; Yield given. Multistep reaction;