hydrogenchloride 1.) THF, benzene, 50 deg C, 15 h; Multistep reaction;

AIBN in neat (no solvent) (N2 or Ar); educts mixt. in molar ratio 1/1 warmed slowly to 70°C for 8-15 h with stepwise addn. of AIBN; distd. (vac.); elem. anal.;