sodium acetate; bis-triphenylphosphine-palladium(II) chloride in pentane in a Schlenk tube under N2 mixing of Sn-compds. in pentane, after 15 min addn. of catalyst and stirring at room temp. for 2 h, addn. of a 5-fold excess of Na-acetate (or Ag- or K-salts), stirring for 1 h; filtn., evapn. of solvent, purity >95percent;