Dowex 50W-X8; hydrogen sulfide in methanol T=-20°C; 1 h;

1: HCl / CHCl3 / 120 h / 0 °C 2: 100 percent / H2S, Dowex 50W-X8 / methanol / 1 h / -20 °C View Scheme

1: 84 percent / hydroxylamine-O-sulphonic acid, 1 M NaOH / H2O / 5 °C / pH 7-8 2: 72 percent / formic acid; CH2Cl2 / 1) < 10 deg C, 20 min, 2) 25 deg C, 3 h 3: 88 percent / acetic anhydride, HClO4 (70percent) / 0.33 h / 25 °C 4: 73 percent / sodium ethanolate / ethanol / 0.33 h View Scheme

1: 72 percent / formic acid; CH2Cl2 / 1) < 10 deg C, 20 min, 2) 25 deg C, 3 h 2: 88 percent / acetic anhydride, HClO4 (70percent) / 0.33 h / 25 °C 3: 73 percent / sodium ethanolate / ethanol / 0.33 h View Scheme

pyridine; hydrogen sulfide

water T=25°C; MechanismRate constant;

T=90 - 95°C;

T=90 - 95°C;