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Type: Text × Publisher: Weinheim : Wiley-VCH × search.filters.applied.f.series: Chemistry - a European journal 25 (2019), Nr. 67 × Subject: hydrogenation ×

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    Preparation of a Series of Supported Nonsymmetrical PNP-Pincer Ligands and the Application in Ester Hydrogenation
    (Weinheim : Wiley-VCH, 2019) Konrath, Robert; Spannenberg, Anke; Kamer, Paul C.J.
    In contrast to their symmetrical analogues, nonsymmetrical PNP-type ligand motifs have been less investigated despite the modular pincer structure. However, the introduction of mixed phosphorus donor moieties provides access to a larger variety of PNP ligands. Herein, a facile solid-phase synthesis approach towards a diverse PNP-pincer ligand library of 14 members is reported. Contrary to often challenging workup procedures in solution-phase, only simple workup steps are required. The corresponding supported ruthenium-PNP catalysts are screened in ester hydrogenation. Usually, industrially applied heterogeneous catalysts require harsh conditions in this reaction (250–350 °C at 100–200 bar) often leading to reduced selectivities. Heterogenized reusable Ru-PNP catalysts are capable of reducing esters and lactones selectively under mild conditions. © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.