Branched phosphazenium salts as effective and versatile cocatalysts for epoxide/CO2 coupling. Issue 8 (3rd February 2023)

• Record Type: Journal Article
• Authors: Brivio, Massimiliano; Veronese, Lorenzo; Tritto, Incoronata; Biagini, Paolo; Po', Riccardo; Boggioni, Laura; Losio, Simona
• Is Part Of: Polymer chemistry. Volume 14:Issue 8(2023)
• Page Start: 963
• Page End: 972
• Publication Date: 2023-02-03
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/d2py01471h
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : Branched phosphazenium salts are tested as alternative cocatalysts to traditional PPNX salts in the CO2 /epoxide copolymerization with different catalysts. Higher molecular weights and comparable or superior conversions and selectivities are achieved. Abstract : Branched phosphazenium salts of general formula [(Me2 N)3 PN]4 P + X − (X − = Cl − or N3 − ) have been tested as cocatalysts for different catalyst systems, such as salen-type chromium and porphyrin cobalt complexes, in the alternating copolymerization of CO2 and epoxides (CHO and PO) under various experimental conditions. Higher monomer conversion than that obtained with the benchmark PPN + X − counterparts under the same conditions was achieved. The polymers obtained have comparable or greater molar masses. Thus, phosphazenium salts can be viable, if not superior, alternatives to onium salts in CO2 /epoxide ROCOP.