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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.

modern research in catalysis

The Nature of the True Catalyst in Transfer Hydrogenation with Alcohol Donors Using (arene)&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;Ru&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;Cl&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;(II)/TsDPEN Precursor