Synthesis and the reversed-phase HPLC analysis ofcis andtrans-dichlorobis(ethylenediamine-ruthenium) chloride isomers

Summary In this work we report the monitoring of the synthesis ofcis andtrans-dichlorobis(ethylenedia-mine)ruthenium chloride isomers by HPLC. The preparation of thecis andtrans complexes were as described in the literature with modifications arising from reversed-phase HPLC results. Thecis andtrans complexes were separated with retention times of 3.0 min and 5.5 min respectively using an ODS column (250 mm×4.6 mm i.d. 5 μm particles, Alltech) and methanol/water 45/55 ratio as mobile phase. According to HPLC results the reaction time to completion is 48 h and not 72 h as previously described. The shorter time resulted in better yield 82% and reduced by-products.