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Selective and adaptable access to N,N'-asymmetrically substituted imidazol-2-ylidene bis-NHC ligands: Pd(II) complexes featuring wide variation in N-alkyl and aryl steric bulk
journal contribution
posted on 2023-05-17, 22:31 authored by Michael GardinerMichael Gardiner, Curtis HoCurtis Ho, Mackay, FM, McGuinness, DS, Tucker, MHN,N'-Asymmetrically substituted, methylene-linked bis(imidazol-2-ylidene) complexes have been prepared subsequent to a selective synthesis of the bis(imidazolium) salt precursors involving the quarternisation of N-alkyl and -aryl imidazoles with N-halomethyl imidazolium salts. The adaptability of the ligand precursor synthesis is illustrated through access to the N-Me/N'-Mes and N-Mes/N'-2,6-(i-Pr)2Ph systems, leading to the Pd(ii) complexes [{(MeIm)(MesIm)CH2}Pd(L)2]n+, L = Cl/I (n = 0) and NCMe (n = 2), and [{(MesIm)[2,6-(i-Pr)2PhIm]CH2}Pd(L)2], L = Cl/I. The dicationic hybrid N,N'-alkyl/aryl complex was inactive in the copolymerisation of ethylene/carbon monoxide, displaying reactivity akin to N,N'-dialkyl analogues.
Funding
Australian Research Council
History
Publication title
Dalton TransactionsVolume
42Issue
20Pagination
7447-7457ISSN
1477-9226Department/School
School of Natural SciencesPublisher
RSC PublicationsPlace of publication
Thomas Graham House, Science Park, Milton Rd, Cambridge, England, Cambs, Cb4 0WfRights statement
Copyright 2013 Dalton TransactionsRepository Status
- Restricted