air in benzene PyPh2CCl added to stirred suspn. of Pd(dba)2 in benzene under N2 at ambient temp.; stirring continued for 20 h; soln. filtered in air; filtrate evapd. to dryness; red-brown residue chromd. (silica gel/CHCl3); CHCl3 removed from orange fraction; orange crystals sepd. on addn. of acetone; elem. anal.;