in dichloromethane T=20°C; 3.5 h;

in tetrahydrofuran N2 atmosphere, stirring (room temp., overnight); removement of solvent (vacuum), washing (Et2O), drying (vacuum);

in hydrogenchloride; ethanol (Ar); placing of (C6H4PPh2)2O and abs. EtOH in flask; slow addn. of soln. of PdCl2 in dilute HCl with stirring; stirring for 3 h at 60°C; crystn. overnight, filtration, washing with water, EtOH and ether, drying in vac.;