1: 84 percent / CeCl3 / tetrahydrofuran / 12 h / 0 - 20 °C 2: 82 percent / t-BuOH, BuLi, CuBr2 / tetrahydrofuran; hexane / 1 h / Ambient temperature View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 60 percent / 30 percent H₂O₂ / bis(2-nitrophenyl) diselenide / CH₂Cl₂ / 34 h / Ambient temperature; var. time<br />2: 40 percent / HCl / tetrahydrofuran; H₂O<br /> <br /> &nbsp;