in potassium carbonate

1: 2,6-dimethylpyridine / dichloromethane / 0.25 h / -78 °C / |Inert atmosphere 2: (N,N'-bis(2,6-diisopropylphenyl)imidazol-2-ylidene)CuOtBu; 1,1,3,3-tetramethyldisiloxane; cesium fluoride / 1,4-dioxane / 4 h / 25 °C / |Glovebox; |Inert atmosphere View Scheme

ethanol

18-crown-6 ether in dimethyl sulfoxide 0.166667 h; Ambient temperature;

hydrogen; carbon; palladium in ethanol T=20°C; 2 h;