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

Binobaid, Abeer Abdulrahman, Iglesias, Manuel Alonso, Beetstra, Dirk Johannes, Kariuki, Benson, Dervisi, Athanasia, Fallis, Ian Andrew 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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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: 04 Jun 2017 01:54

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