Reaction Kinetics, Mechanisms and Catalysis

, Volume 126, Issue 1, pp 439–451 | Cite as

Hydrogenation of α,β-unsaturated aldehydes in aqueous media with a water-soluble Pd(II)-sulfosalan complex catalyst

  • Réka Gombos
  • Brigitta Nagyházi
  • Ferenc JoóEmail author


A water-soluble Pd(II)-salan complex Na2[Pd(HSS)] (HSS = sulfonated tetrahydrosalen or sulfosalan) was examined as a hydrolytically stable catalyst for hydrogenation of various aldehydes. Na2[Pd(HSS)] was found to be a highly selective catalyst towards hydrogenation of C=C over C=O bonds in cinnamaldehyde and crotonaldehyde (used as representative α,β-unsaturated aldehydes). Kinetic measurements revealed an important role of protonation/deprotonation of one of the phenolate oxygens of the N2O2 coordination framework in the reaction mechanism. Na2[Pd(HSS)] was also found an efficient catalyst for transfer hydrogenation of aldehydes from isopropanol in the presence of various bases. The results show, for the first time, the usefulness of easily accessible, hydrolytically stable Pd(II)-salan type catalysts in aqueous catalytic organometallic hydrogenations.


Hydrogenation Palladium Salen-type ligands Transfer hydrogenation α,β-Unsaturated aldehydes 



The research was supported by the EU and co-financed by the European Regional Development Fund under the Projects GINOP-2.3.2-15-2016-00008 and GINOP-2.3.3-15-2016-00004.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Department of Physical ChemistryUniversity of DebrecenDebrecenHungary
  2. 2.MTA-DE Redox and Homogeneous Catalytic Reaction Mechanisms Research GroupDebrecenHungary

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