hydrogenchloride in hydrogenchloride; acetone byproducts: KCl; several drops of 6 N HCl adding to Pt complex soln., allowing to stand for 24 h, additional drop of 6 N HCl adding to complete the reaction, after 12 h ppt. collecting by centrifugation, washing with acetone, filtrate evapg.; purified by pptn. with Et2O, identified by elem. anal.;