1: 1.) Mg / 1.) ether, 2.) benzene, reflux, 5 h 2: pyridine / 3 h / Heating View Scheme

1: 1.) Mg / 1.) ether, 2.) benzene, reflux, 5 h 2: 25 percent / aluminum isopropoxide / benzene; acetone / 7 h / Heating 3: 77 percent / benzene / 1 h / Heating View Scheme

magnesium 1.) ether, 2.) benzene, reflux, 5 h; Yield given. Multistep reaction;