diphosphorus pentasulfide in pyridine T=90°C; 24 h;

1: SOCl2 / benzene; dimethylformamide / 24 h / Ambient temperature 2: 93 percent / benzene / 24 h / Ambient temperature 3: 91 percent / phosphorpentasulfide / pyridine / 24 h / 90 °C View Scheme

1: 93 percent / benzene / 24 h / Ambient temperature 2: 91 percent / phosphorpentasulfide / pyridine / 24 h / 90 °C View Scheme