1: With triethylamine in tetrahydrofuran T=20°C; 3 h; 2: With hydrogenchloride in ethanol 1 h; Heating;

1: KOH / ethanol; H2O / 0.5 h / Ambient temperature 2: 1.) PCl5, 2.) AlCl3 / 1.) benzene, r.t., 0.5 h, 2.) benzene, r.t., 0.5 h View Scheme