oxygen; copper diacetate 21 h; Ambient temperature;

1: pyridine / Ambient temperature 2: t-BuOK / tetrahydrofuran / 1 h / Heating View Scheme

trimethylsilyl iodide; sodium hydrogencarbonate; 1,1,1,3,3,3-hexamethyl-disilazane 1) CCl4, 0 deg C, 3 h 2) 25 deg C, 3 h 3) pentane; Yield given. Multistep reaction. Yields of byproduct given;