An Effective and Reusable Hyperbranched Polymer Immobilized
Rhodium Catalyst for the Hydroformylation of Olefins
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Posted on 2019-06-05 - 17:40
Hydroformylation
remains the most applied industrial process to
produce aldehydes. Much research has been devoted to developing new
catalyst systems since aldehydes are highly desired. Supported metal
catalyst complexes have drawn renewed attention due to an increased
interest in benign and environmental processes. In this paper, NiXantphos
has been immobilized on hyperbranched poly(arylene oxindole) supports,
different in linker, via a one-step postfunctionalization. Two heterogeneous
hyperbranched poly(arylene oxindole) supported NiXantphos ligands
were evaluated in the microwave-assisted rhodium-catalyzed hydroformylation
of olefins. After selection of the best reaction conditions, a variety
of functionalized olefins were successfully converted into the desired
linear aldehydes working under milder conditions compared to known
processes, in terms of syngas pressure (4.8 bar), temperature (75
°C), and reaction times (20 min). The increased activity might
emanate from a positive dendritic effect unique to the dendritic nature
of the support. Furthermore, the catalyst system was successfully
recovered and reused without a decrease in activity or regioselectivity,
thus demonstrating to be a valid alternative to classical homogeneous
procedures.
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Verheyen, Thomas; Santillo, Niccolò; Marinelli, Davide; Petricci, Elena; M. De Borggraeve, Wim; Vaccaro, Luigi; et al. (2019). An Effective and Reusable Hyperbranched Polymer Immobilized
Rhodium Catalyst for the Hydroformylation of Olefins. ACS Publications. Collection. https://doi.org/10.1021/acsapm.9b00240