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High Pressure Liquid Chromatography (HPLC) Equipped with a Plus Autosampler, SurveyorTM LC Pump Plus and Surveyor PDA Plus Detector. The HPLC Instrument Was Controlled and the Data Analyzed Using the ChromQuestTM 5.0 Data System, with UV-Vis Detector, Chiral Pak AD-H Column and Hexane: 2-Propanol Mixtures Were Used for Elution.

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• TITLE: The Nature of the True Catalyst in Transfer Hydrogenation with Alcohol Donors Using (arene)2Ru2Cl4(II)/TsDPEN Precursor

  AUTHORS: Judith Toubiana, Liraz Medina, Yoel Sasson

  KEYWORDS: Catalytic transfer Hydrogenation (CTH), Asymmetric Transfer Hydrogenation (ATH), Ruthenium Nanoparticles, Ruthenium Complexes, Nanocatalyst, Chiral Nanoparticles

  JOURNAL NAME: Modern Research in Catalysis, Vol.3 No.3, July 15, 2014

  ABSTRACT: The widespread precatalyst (prepared in-situ or ex-situ) (arene) RuTsDPEN advocated for highly effectual asymmetric transfer hydrogenation (ATH) reactions with 2-propanol as hydrogen donor at ambient conditions, is proven to be unstable under the strong reducing conditions prevailing in the reaction mixtures (blend of alcohol and a base such as KOH). We assert that the true catalysts are the ruthenium metal nanoclusters formed swiftly under the reducing conditions of these systems. The TsDPEN ligand plays a critical role in the generation and formatting of the active catalyst including wreaking chiral properties to the so formed catalytic nanoparticles. Kinetic measurements, NMR, UV-visible spectroscopy, circular dichroism (CD) and TEM analyses corroborate this argument.