1.1: 72 percent / t-BuOK / 2-methyl-propan-2-ol; diethyl ether / 4 h / 20 °C 2.1: cuprous chloride; nC4H9NH2; hydroxylamine hydrochloride / tetrahydrofuran; methanol / 0 °C 2.2: 81 percent / tetrahydrofuran; methanol / 5 h / 10 - 20 °C View Scheme