1: 77 percent / copper acetylacetonate, NaBH4 / ethanol / 2 h / Ambient temperature 2: 58 percent / tetrafluoroboric acid, sodium nitrite / H2O / 0.5 h / -10 °C 3: 61 percent / tetrathiafulvalene / acetone / 2 °C View Scheme

triethylamine in benzene 18 h;