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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
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
Related URLs:	UTAS Profile: Gardiner, MG Google Scholar: Ho, CC UTAS Profile: Ho, CC
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