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Air and moisture tolerant synthesis of a chelated bis(NHC) methylpalladium(II) complex relevant to alkyl migration processes in catalysis
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Abstract
Abstract An air- and moisture-tolerant alternate synthetic pathway to the preparation of a cationic chelated bis(NHC) methylpalladium(ii) complex, [{(MesIm)2CH2}Pd(Me)(NCMe)][PF6], is described. The pathway involves the isolation of a bis(NHC) AgI complex, [{(MesIm)2CH2}2Ag2][PF6]2, via metallation of the corresponding diimidazolium salt with Ag2O followed by carbene transfer to [(COD)PdBrMe]. This new method avoids a previously reported unstable intermediate that displayed rapid decomposition at room temperature, attaining the targeted cationic methylpalladium(ii) complex in high yield. CO/ethylene copolymerisation catalysis trials are reported showing solvent dependent catalyst lifetime and copolymer yields. Preliminary ethylene insertion studies are also outlined revealing possible pathways leading towards catalyst deactivation.
Item Type: | Article |
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Authors/Creators: | Gardiner, MG and Ho, CC and McGuinness, DS and Liu, YL |
Keywords: | palladium, catalysis, NHC, copolymerisation |
Journal or Publication Title: | Australian Journal of Chemistry |
Publisher: | C S I R O Publishing |
ISSN: | 0004-9425 |
DOI / ID Number: | 10.1071/CH20194 |
Copyright Information: | Journal compilation Copyright CSIRO 2020 |
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