1: 81 percent / conc. HCl / 0.08 h / Heating 2: hexamethyldisilazane, ammonium sulfate / 1.) 2.5 h, reflux, 2.) acetonitrile, 24 h View Scheme

ammonium sulfate; 1,1,1,3,3,3-hexamethyl-disilazane 1.) 2.5 h, reflux, 2.) acetonitrile, 24 h; Yield given. Multistep reaction;