1: 93 percent / 28percent aq. NH4OH / dimethylformamide / 0.08 h / Ambient temperature 2: 85 percent / methanol; dimethylformamide / 1 h / 60 °C 3: 41 percent / isopentyl nitrite, CH2I2 / 2.5 h / 85 °C 4: 28 percent / BuLi, TMEDA / tetrahydrofuran / 0.01 h / -100 °C View Scheme

ammonium hydroxide in N,N-dimethyl-formamide 0.0833333 h; Ambient temperature;