potassium tert-butylate; oxygen; dimethyl sulfoxide T=25°C; 0.25 h;

1: 2-phenyl-1H-imidazole With sodium hydride in N,N-dimethyl-formamide; mineral oil T=20°C; 1 h; 2: benzyl bromide in N,N-dimethyl-formamide; mineral oil T=20°C;