1: 85 percent / sulfuric acid / Ambient temperature 2: 1.) chlorotrimethylsilane / 1) pyridine, room temperature, 1 h; 2) pyridine, room temperature, 2 h View Scheme

1: 85 percent / sulfuric acid / Ambient temperature 2: 1.) chlorotrimethylsilane / 1) pyridine, room temperature, 1 h; 2) pyridine, room temperature, 2 h 3: sodium hydride / dimethylformamide / 48 h / Ambient temperature 4: sodium methoxide / dimethylformamide / Ambient temperature 5: 47 percent / bromotrimethylsilane / acetonitrile / Ambient temperature View Scheme

sulfuric acid Ambient temperature;