tetrafluoroboric acid; isopentyl nitrite 1.) MeOH, 0 deg C, 4 h, 2.) xylene, reflux, 9 h; Yield given. Multistep reaction;

<b>Multi-step reaction with 2 steps<br /> </b>1: arsenic (V)-oxide; concentrated sulfuric acid / 140 &deg;C<br />2: concentrated aqueous HCl; acetic acid; SnCl₂ <br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1: 61percent HNO₃, conc. H₂SO₄ <br />2: H₂, methanol. HCl / 5percent Pd-C<br /> <br /> &nbsp;