sodium hydroxide in methanol; water T=50°C; 6 h;

1: 2-n-propyl-4-methyl-6-(1'-methylbenzimidazol-2'-yl)benzimidazole With sodium hydroxide; tetra(n-butyl)ammonium hydrogensulfate in water; toluene T=80 - 90°C; Heating / reflux; 2: methyl 4'-bromobiphenyl-2-carboxylate in water; toluene 3.5 h; Product distribution / selectivity;