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Polymeric bis(triphenylphosphine)iminium chloride as a recyclable catalyst. | LitMetric

AI Article Synopsis

Article Abstract

Metal-free catalysts have garnered considerable interest as an environmental and economical alternative to precious metal catalysts. Bis(triphenylphosphine)iminium chloride (PPNCl) has emerged as a prominent choice due to its air and thermal stability and broad reactivity, especially in applications where a bulky cation is needed. The high phosphorus content and synthetic effort required for catalyst synthesis increase environmental impact; the recyclability of PPNCl in catalytic processes remains largely unexplored. The potential development of a polymer-supported PPNCl catalysts therefore desirable to enable this recyclability. In this work, we synthesise polymeric PPNCl (poly(PPNCl)) for the first time. Poly(PPNCl) demonstrates a comparative catalytic reactivity to its small molecule variant when employed as a catalyst in halogen-exchange reactions and CO/epoxide coupling. For the latter the effect of catalyst loading, CO pressure, reaction time and addition of co-catalyst on conversion and selectivity was investigated. Poly(PPNCl) was easily recovered from the crude product by simple precipitation and its catalytic reactivity was well-maintained over three reaction cycles, providing environmental and economic advantages for sustainable reaction development.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11382542PMC
http://dx.doi.org/10.1039/d4sc03119aDOI Listing

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