in n-heptane (Ar); stirred at 50°C for 45 min; evapd. (vac.), dissolved in CH2Cl2, silanized silica gel added, evapd. (vac.), chromd. (silica gel, light petroleum), recrystd. (light petroleum/CH2Cl2, -20°C);

ammonium cerium(IV) nitrate in water; acetonitrile T=50°C; Oxidation; 15 h;

1: hydrazine hydrate 2: KOH / 150 °C View Scheme

hydrazine hydrate