1: 88 percent / phenyltrimethylammonium perbromide / methanol / 0.17 h 2: 50 percent / K2CO3 / acetone / 24 h / Ambient temperature 3: 57 percent / NaI / acetone / 4 h / Ambient temperature 4: 88 percent / NaBH4 / methanol / 0.25 h / Ambient temperature 5: 75 percent / satd. NH3/MeOH / 2 h / Ambient temperature View Scheme