hydrogen; palladium on activated charcoal in methanol; acetic acid P=760 Torr; 3 h; Ambient temperature;

1: 100 percent / CH2Cl2; diethyl ether / 1.) -20 deg C, 2 h, 2.) RT, 12 h 2: 88 percent / CH2Cl2 / 3 h / Irradiation 3: 55 percent / H2 / 5percent Pd/C / methanol; acetic acid / 3 h / 760 Torr / Ambient temperature View Scheme