1: 30 g / hexamethyldisilazane, pyridine / 1 h / Ambient temperature 2: 1.) Mg / 1.) ether, 2.) benzene, reflux, 5 h 3: pyridine / 3 h / Heating View Scheme

1: 30 g / hexamethyldisilazane, pyridine / 1 h / Ambient temperature 2: 1.) Mg / 1.) ether, 2.) benzene, reflux, 5 h 3: 25 percent / aluminum isopropoxide / benzene; acetone / 7 h / Heating 4: 77 percent / benzene / 1 h / Heating View Scheme

ammonium chloride; iodine; magnesium in tetrahydrofuran; methanol; chloroform

in tetrahydrofuran 1.) reflux, 2 h, 2.) 22 deg C;

1: 30 g / hexamethyldisilazane, pyridine / 1 h / Ambient temperature 2: 1.) Mg / 1.) ether, 2.) benzene, reflux, 5 h View Scheme