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The complexes  trans / cis- [RuCl 2 (DPEphos)(ampy)] ( trans  –  1a ;  cis  –  1b ) and  trans/cis- [RuCl 2 (DPEphos)(en)] ( trans  –  2a ;  cis  –  2b ) were obtained from the reactions of  mer -[RuCl 2 (DPEphos)(PPh 3 )] (PPh 3  = triphenylphosphine) with the corresponding amine in CH 2 Cl 2 . The isomer  1a  was observed  in situ  when the reaction was carried out at r.t.; isolation leads to mixtures with  1b , while the latter was isolated when the reaction was performed under reflux. On the other hand,  trans- [RuCl 2 (DPEphos)(en)] ( 2a ) was obtained at r.t., in good yield and the  cis -isomer  2b  was observed when the reaction was carried out under reflux or when a CH 2 Cl 2  solution of  2a  is exposed to ambient light, but  2b  was not isolated in pure form even under reflux for one week. Cyclic voltammetry studies revealed the presence of one reversible process with E 1/2  0.57 and 0.40 V for  1b  and  2a , respectively. Both  1b  and  2a  were used as pre-catalysts for reduction of acetophenone and  p -substituted acetophenones (F–, Me– and MeO–) in transfer-hydrogenation conditions (isopropanol, 82 °C, and pre-catalyst:KOH:acetophenones in molar ratio 1:20:500 and/or 1:20:1000) showing conversions of 93–99% and TOF values up to 4.2 10 4  h −1 .

journal of coordination chemistry

[RuCl 2 (DPEphos)(N-N)] (DPEphos = bis[(2-diphenylphosphino)phenyl]ether; N-N = 2-aminomethylpyridine or ethylenediamine): synthesis, characterization and transfer hydrogenation of aryl-ketones