in toluene carried out with exclusion of air and moisture; 1 equiv of AgPF6 added to a stirred soln. of the Pd complex; mixt. stirred for further 20 min. at room temp.; volume reduced in vac., pentane added, filtered through silanized silica gel, elution with CH2Cl2, crystn. from CH2Cl2-Et2O (1:1) at -30°C; elem. anal.;