carbon monoxide; 3 A molecular sieve; 1,8-diazabicyclo[5.4.0]undec-7-ene; selenium in 1,4-dioxane T=120°C; P=22800 Torr; 3 h;

carbon monoxide in toluene byproducts: CO2; High Pressure; (N2), autoclave; CO is introduced (P(CO)=50 bar), react. of Ru3(CO)12 with ClC6H4CHNC6H4NO2 at 220°C for 3.5 h under magnetic stirring; autoclave is cooled rapidly (ice bath) and then blown off, substituted benzimidazole is filtered off, Ru complex isolated by chromy. (silica gel, CH2Cl2/EtOH);