PEG-400 T=110°C; 0.5 h; Neat (no solvent);

oxygen; CaO in ethylene glycol T=80°C; P=760.051 Torr; 8 h;

1: 2,5,6,7-tetrahydro-2-phenyl-3H-pyrrolo[2,1-c]-1,2,4-triazol-3-ylidenium chloride; 1,8-diazabicyclo[5.4.0]undec-7-ene / tetrahydrofuran / 3 h / 65 °C / Inert atmosphere 2: air / tetrahydrofuran; ethyl acetate / 20 °C View Scheme