in acetone room temp., N2 atmosphere; addn. of org. compd. to suspn. of Au-compd. in toluene, stirring (1 h); filtration, recrystn. of Ag-compd. (CH2Cl2/hexane), evapn. of filtrate, washing (toluene), recrystn. of Au-compd. (acetone/hexane);