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Author: Beller, Matthias × Subject: Olefins ×

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    Iron/N-doped graphene nano-structured catalysts for general cyclopropanation of olefins
    (Cambridge : RSC, 2020) Sarkar, Abhijnan; Formenti, Dario; Ferretti, Francesco; Kreyenschulte, Carsten; Bartling, Stephan; Junge, Kathrin; Beller, Matthias; Ragaini, Fabio
    The first examples of heterogeneous Fe-catalysed cyclopropanation reactions are presented. Pyrolysis of in situ-generated iron/phenanthroline complexes in the presence of a carbonaceous material leads to specific supported nanosized iron particles, which are effective catalysts for carbene transfer reactions. Using olefins as substrates, cyclopropanes are obtained in high yields and moderate diastereoselectivities. The developed protocol is scalable and the activity of the recycled catalyst after deactivation can be effectively restored using an oxidative reactivation protocol under mild conditions. This journal is © The Royal Society of Chemistry.
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    Efficient Synthesis of Novel Plasticizers by Direct Palladium-Catalyzed Di- or Multi-carbonylations
    (Weinheim : Wiley-VCH, 2022) Hu, Yuya; Sang, Rui; Vroemans, Robby; Mollaert, Guillaume; Razzaq, Rauf; Neumann, Helfried; Junge, Henrik; Franke, Robert; Jackstell, Ralf; Maes, Bert U. W.; Beller, Matthias
    Diesters are of fundamental importance in the chemical industry and are used for many applications, e.g. as plasticizers, surfactants, emulsifiers, and lubricants. Herein, we present a straightforward and efficient method for the selective synthesis of diesters via palladium-catalyzed direct carbonylation of di- or polyols with readily available alkenes. Key-to-success is the use of a specific palladium catalyst with the “built-in-base” ligand L16 providing esterification of all alcohols and a high n/iso ratio. The synthesized diesters were evaluated as potential plasticizers in PVC films by measuring the glass transition temperature (Tg) via differential scanning calorimetry (DSC).