1: 65 percent / copper powder / 3 h / 170 °C 2: 65 percent / tin, hydrochloric acid / ethanol / 1 h / Heating 3: 1.) tetrafluoroboric acid, sodium nitrite / 1.) water, 0 deg C, 2.) pyrolysis View Scheme

1: 1.) sodium nitrite, sulfuric acid, 2.) copper(I) bromide, hydrobromic acid / 1.) acetic acid, 40 deg C, 1 h, 2.) 80 deg C, 1 h 2: 65 percent / copper powder / 3 h / 170 °C 3: 65 percent / tin, hydrochloric acid / ethanol / 1 h / Heating 4: 1.) tetrafluoroboric acid, sodium nitrite / 1.) water, 0 deg C, 2.) pyrolysis View Scheme

1: 65 percent / copper powder / 3 h / 170 °C 2: 65 percent / tin, hydrochloric acid / ethanol / 1 h / Heating 3: 1.) tetrafluoroboric acid, sodium nitrite / 1.) water, 0 deg C, 2.) pyrolysis View Scheme

1: 65 percent / tin, hydrochloric acid / ethanol / 1 h / Heating 2: 1.) tetrafluoroboric acid, sodium nitrite / 1.) water, 0 deg C, 2.) pyrolysis View Scheme

tetrafluoroboric acid; sodium nitrite 1.) water, 0 deg C, 2.) pyrolysis; Yield given. Multistep reaction;