KNO2; acetic acid in water; tert-butyl alcohol 4 h; Ambient temperature;

1: 90 percent / Li2CuCl4 / tetrahydrofuran / Ambient temperature 2: magnesium, iodine / 1.) ether, reflux 2 h; 2.) ether, -78 deg C 3: 98 percent / potassium nitrite, acetic acid / H2O; 2-methyl-propan-2-ol / 4 h / Ambient temperature View Scheme

1: magnesium, iodine / 1.) ether, reflux 2 h; 2.) ether, -78 deg C 2: 98 percent / potassium nitrite, acetic acid / H2O; 2-methyl-propan-2-ol / 4 h / Ambient temperature View Scheme