1: 78 percent / NaNO2 / acetic acid / 0.25 h / Ambient temperature 2: 83 percent / diethyl ether / 1 h / Ambient temperature 3: 65 percent / 1N aq. NaOH / propan-2-ol / 1 h / Ambient temperature View Scheme

1: 78 percent / NaNO2 / acetic acid / 0.25 h / Ambient temperature 2: 53 percent / NaBH4 / ethanol / 4 h / Ambient temperature 3: acetic acid / 0.17 h / Heating View Scheme

1: 78 percent / NaNO2 / acetic acid / 0.25 h / Ambient temperature 2: 53 percent / NaBH4 / ethanol / 4 h / Ambient temperature 3: 16.5 percent / pivalic acid / 1,2-dichloro-ethane / 0.5 h / Heating 4: 63.5 percent / (CH3)3COK / methanol / 0.17 h / Heating View Scheme