1: 97 percent / hydrogen / Lindlar-catalyst, 1,2-bis<(2-hydroxyethyl)thio>ethane / ethanol / 4 h / Ambient temperature 2: 65 percent / TsOH*H2O / CH2Cl2 / 2 h / Ambient temperature View Scheme

1: 97 percent / hydrogen / Lindlar-catalyst, 1,2-bis<(2-hydroxyethyl)thio>ethane / ethanol / 4 h / Ambient temperature 2: 13 percent / TsOH*H2O / CH2Cl2 / 2 h / Ambient temperature View Scheme