potassium tert-butylate in tetrahydrofuran T=20°C; 12 h;

in diethyl ether Et2O was added via cannula to mixt. of ligand and Pd compd. at -78°C; mixt. was stirred at -78°C for 30 min; warmed with stirring to room temp. over 2 h; ether removed (vac.); triturated with hexane; filtered in air; washed (hexane); elem. anal.;