sulfuric acid in ethylene glycol dimethyl ether 72 h; Heating;

1: 70 percent / p-TsOH / benzene / Heating 2: 1.) Cu(I)I / 1.) ether, -10 deg C, 2.) ether, 75 min, -10 deg C 3: 65 percent / 02, 6M HCl, acetic acid / 5 h / Heating View Scheme