1: 90 percent / stannous chloride, 5percent aq. hydrochloric acid / 3 h / Heating 2: 1.) sodium nitrite, 2.5percent aq. hydrochloric acid, 2.) sodium azide / 1.) 4 deg C, 1 h, 2.) 1 h 3: 50 percent / phosphorus oxychloride, conc. hydrochloric acid / 3 h / 110 °C View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 50 percent / K₂CO₃, Cu, KI / dimethylformamide / 16 h / Heating<br />2: 80 percent / conc. H₂SO₄ / 4 h / 100 &deg;C<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: 75 percent<br />2: 80 percent<br />3: 95 percent / 10percent aq. hydrochloric acid<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1: 50 percent / K₂CO₃, Cu, KI / dimethylformamide / 16 h / Heating<br />2: 80 percent / conc. H₂SO₄ / 4 h / 100 &deg;C<br /> <br /> &nbsp;