Cationic Charge-Appended Abnormal Carbenes: Synthesis and Study of Electronically Modified Abnormal N-Heterocyclic Carbenes

Catriona R. Vanston, Thomas P. Nicholls, Alex C. Bissember, Michael G. Gardiner, Curtis C. Ho

Research output: Contribution to journalArticlepeer-review

Abstract

A range of palladium complexes featuring electronically modified, imidazole-based abnormal N-heterocyclic carbene (aNHC) ligands have been prepared in the hopes of accessing a new class of cationic aNHC ligands electronically distinct from normal NHCs and aNHCs. These palladium complexes represent the first examples of transition metal-ligated aNHC complexes featuring a cationic moiety adjacent to the abnormal carbene center. It was anticipated that these design principles could facilitate electron transfer between the imidazolinylidene and the cationic heterocycle, thus reducing the electron density at the abnormal carbene center. However, this case study suggests that greater conformational restrictions that allow for heterocycle coplanarity are necessary to achieve significant electron transfer and enable access to a new class of cationic charge-appended aNHCs with unique electronic properties.

Original languageEnglish
Pages (from-to)622-632
Number of pages11
JournalInorganic Chemistry
Volume61
Issue number1
DOIs
Publication statusPublished - 10 Jan 2022
Externally publishedYes

Keywords

  • aNHC
  • Palladium nanoparticles
  • abnormal carbenes
  • electron transfer
  • imidazolinylidene
  • cationic heterocycle

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