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Cationic charge-appended abnormal carbenes: synthesis and study of electronically modified abnormal N-heterocyclic carbenes

Vanston, CR, Nicholls, TP, Bissember, AC ORCID: 0000-0001-5515-2878, Gardiner, MG ORCID: 0000-0001-6373-4253 and Ho, CC ORCID: 0000-0002-7555-0635 2022 , 'Cationic charge-appended abnormal carbenes: synthesis and study of electronically modified abnormal N-heterocyclic carbenes' , Inorganic Chemistry, vol. 61, no. 1 , pp. 622-632 , doi: 10.1021/acs.inorgchem.1c03336.

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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.

Item Type: Article
Authors/Creators:Vanston, CR and Nicholls, TP and Bissember, AC and Gardiner, MG and Ho, CC
Keywords: normal N-heterocyclic carbenes, abnormal N-heterocyclic carbenes, palladium
Journal or Publication Title: Inorganic Chemistry
Publisher: Amer Chemical Soc
ISSN: 0020-1669
DOI / ID Number: 10.1021/acs.inorgchem.1c03336
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Copyright 2021 American Chemical Society

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