tetrabutylammomium bromide; water; potassium carbonate; potassium hydrogencarbonate; toluene-4-sulfonic acid 1) EtOH, 6 h, reflux, 2) CH2Cl2, 4 h, 20-25 deg C; Yield given;

hydrogenchloride in N,N-dimethyl-formamide; benzene 2 h; Ambient temperature; Yield given;