ammonium hydroxide Ar; a mixture of the starting complex and NH4OH was refluxed for 25 min; addn. of Ca(SO3)2; isoln. of (OH)(NH3)5Ru(SO3)2at 0° C; dissoln. in oxalic acid; reflux for 5 min; isolation of the oxalato-intermediate; reflux of a HCl-soln. for 10 min;; hot filtration; addn. of ethanol to the filtrate; cooling overnight at 0 ° C; filtration; recrystn. from warm 8 M HCl/ethanol; chilling at 0 ° C for 8 h;;

in hydrogenchloride byproducts: 3,4-dihydroxybenzoic acid; Ru complex and acid mixing, NaBH4 carefull addn.; organic ligand extraction (ethylacetate), H2O2 addn. to aq. phase, heating, evapn. to dryness, residue recrystn. from aq. HCl;

in hydrogenchloride 15 min, heating; filtration;