Abstract
AbstractHydrogen transfer reduction processes are attracting increasing interest from synthetic chemists in view of their operational simplicity. Reaction of [Ph2PNHCH2‐C4H3S] with [Ru(η6‐benzene)(µ‐Cl)Cl]2, [Rh(µ‐Cl)(cod)]2 and [Ir(η5‐C5Me5)(µ‐Cl)Cl]2 gave a range of new monodendate complexes [Ru(Ph2PNHCH2‐C4H3S)(η6‐benzene)Cl2], 1, [Rh(Ph2PNHCH2‐C4H3S)(cod)Cl], 2, and [Ir(Ph2PNHCH2‐C4H3S)(η5‐C5Me5)Cl2], 3, respectively. All new complexes were fully characterized by analytical and spectroscopic methods. 1H31P NMR, 1H13C HETCOR or 1H1H COSY correlation experiments were used to confirm the spectral assignments. 1–3 are suitable catalyst precursors for the transfer hydrogenation of acetophenone derivatives. Notably [Ru(Ph2PNHCH2‐C4H3S)(η6‐benzene)Cl2], 1, acts as an excellent catalyst, giving the corresponding alcohols in 98–99% yields in 30 min at 82 °C (TOF ≤200 h−1) for the transfer hydrogenation reaction in comparison to analogous rhodium or iridium complexes. This transfer hydrogenation is characterized by low reversibility under these conditions. Copyright © 2011 John Wiley & Sons, Ltd.
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