1,8-diazabicyclo[5.4.0]undec-7-ene in toluene T=70 - 75°C;

acetic acid

lithium diisopropyl amide in tetrahydrofuran 1.) from -50 to 20 deg C, 2 h; 2.) 20 deg, 30 min; 3.) from -78 deg C to 20 deg C during 12 h;

1: toluene / 4 h / Heating 2: 25 percent / 1,8-diazabicyclo[5.4.0]undec-7-ene / toluene / 70 - 75 °C View Scheme

T=150°C; 10 h;

1: 13 percent / 2,4-Bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetan-2,4-disufid (1) / toluene / 1 h / Heating 2: 50 percent / 2,4-Bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetan-2,4-disufid (1) / toluene / 1 h / Heating View Scheme