Expanded ring and functionalised expanded ring N-heterocyclic carbenes as ligands in catalysis

Binobaid, Abeer Abdulrahman, Iglesias, Manuel Alonso, Beetstra, Dirk Johannes, Kariuki, Benson ORCID: https://orcid.org/0000-0002-8658-3897, Dervisi, Athanasia ORCID: https://orcid.org/0000-0002-0590-5496, Fallis, Ian Andrew ORCID: https://orcid.org/0000-0001-7361-0182 and Cavell, Kingsley John 2009. Expanded ring and functionalised expanded ring N-heterocyclic carbenes as ligands in catalysis. Dalton Transactions (35) , pp. 7099-7112. 10.1039/b909834h

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Abstract

The synthesis of new functionalised 6- and 7-membered NHC (N-heterocyclic carbene) precursors bearing anisidyl or pyridine N-substituents, both symmetrically and non-symmetrically substituted is reported. Their corresponding rhodium(I) and iridium(I) complexes, M(COD)(NHC)Cl, were also prepared and characterised. The unusual Rh(III)/Rh(I) salt, [Rh(η2-NHC-py)2Cl2][Rh(COD)Cl2], was obtained with one of the pyridyl-functionalised NHC ligands. Single-crystal X-ray analyses have been obtained for the majority of the complexes and NHC salts. The activity of these complexes was tested in the hydrogenation of a range of substrates with molecular hydrogen, including 1-cyclooctadiene and 2-methyl styrene, where they show enhanced activity and stability in comparison to non-functionalised NHC analogues, operating under exceptionally mild conditions (ambient temperature and atmospheric pressure).

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	RSC
ISSN:	1477-9226
Last Modified:	02 Jan 2025 15:42
URI:	https://orca.cardiff.ac.uk/id/eprint/5859

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