1: 1.) Mg / 1.) THF, reflux, 1 h, 2.) THF, RT, 2 h 2: PCl5 / CH2Cl2 / 1 h / Ambient temperature 3: ethanol / 1 h / Ambient temperature View Scheme

1: PCl5 / CH2Cl2 / 1 h / Ambient temperature 2: ethanol / 1 h / Ambient temperature View Scheme

in ethanol 1 h; Ambient temperature;