potassium hydrogensulfate; silica gel in methanol T=65°C; 5 h;

tetra-n-butylammonium tetrafluoroborate in tetrahydrofuran Electrochemical reaction;

potassium hydroxide in ethanol 0.5 h; Heating;

1.1: dichloromethane / 3 h / -40 °C 2.1: water; sodium hydrogencarbonate / methanol / 3 h 3.1: pyridine / dichloromethane / -30 °C 4.1: sodium azide / N,N-dimethyl-formamide / 3 h / 60 °C 5.1: sodium hydroxide / methanol; water / 1 h 6.1: chloro-trimethyl-silane; sodium iodide / acetonitrile / 2 h / 20 °C 6.3: pH 9 View Scheme

1: aqueous perchloric acid 2: chromium (VI)-oxide; pyridine 3: acetic acid; zinc-powder 4: diethyl ether; benzene / Behandeln des Reaktionsgemisches mit wss. Ammoniumchlorid-Loesung und Behandeln des Reaktionsprodukts mit Acetanhydrid und Pyridin 5: thionyl chloride; pyridine 6: methanol. KOH-solution View Scheme