hydrogen sulfide; triethylamine in methanol T=25°C; 6 h;

sulfur 3 h; heating in water-bath;

1: 42 percent / polyethylene glycol-linked Burgess reagent / tetrahydrofuran / 1.) 25 deg C, 1.5 h, 2.) 70 deg C, 2 h 2: 42 percent / H2S, Et3N / methanol / 6 h / 25 °C View Scheme

1: 77 percent / Et3N / CH2Cl2 / 2 h / 0 - 25 °C 2: 42 percent / polyethylene glycol-linked Burgess reagent / tetrahydrofuran / 1.) 25 deg C, 1.5 h, 2.) 70 deg C, 2 h 3: 42 percent / H2S, Et3N / methanol / 6 h / 25 °C View Scheme

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polyethylene glycol-linked Burgess reagent in tetrahydrofuran 1.) 25 deg C, 1.5 h, 2.) 70 deg C, 2 h;