zinc in toluene T=20°C; 1.5 h;

3-chloro-benzenecarboperoxoic acid in dichloromethane T=0°C; 1 h;

n-butyllithium; N,N,N',N,-tetramethylethylenediamine in tetrahydrofuran T=0 - 20°C; 3.5 h;

1: 83 percent / triphenylphosphine / CCl4 / 5 h / Heating; various pyrrolyl sulfoxides, various methods of reduction 2: 37 percent / 86percent m-chloroperbenzoic acid / CH2Cl2 / 1 h / 0 °C View Scheme