1: 96 percent / H2SO4 / methanol; H2O / 1.)0 deg C, 1h 2.) r. t., 24h 2: 92 percent / H2, 760 torr / Pd/C (10percent) / ethanol; triethylamine / 48 h / Ambient temperature 3: 78 percent / H2SO4, NaNO2 / 18 h / Ambient temperature 4: diethyl ether / 48 h / 5 °C View Scheme

1: 92 percent / H2, 760 torr / Pd/C (10percent) / ethanol; triethylamine / 48 h / Ambient temperature 2: 78 percent / H2SO4, NaNO2 / 18 h / Ambient temperature 3: diethyl ether / 48 h / 5 °C View Scheme

1: 78 percent / H2SO4, NaNO2 / 18 h / Ambient temperature 2: diethyl ether / 48 h / 5 °C View Scheme

in diethyl ether T=5°C; 48 h;