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Water‐Soluble Ir III N‐Heterocyclic Carbene Based Catalysts for the Reduction of CO 2 to Formate by Transfer Hydrogenation and the Deuteration of Aryl Amines in Water
Author(s) -
Azua Arturo,
Sanz Sergio,
Peris Eduardo
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201002907
Subject(s) - carbene , transfer hydrogenation , chemistry , catalysis , formate , moiety , aryl , sulfonate , ligand (biochemistry) , medicinal chemistry , sodium formate , ton , chelation , organic chemistry , ruthenium , sodium , biochemistry , alkyl , receptor , fishery , biology
Two new water‐soluble [IrI 2 (AcO)(bis‐NHC)] complexes (NHC=N‐heterocyclic carbene) incorporating a sulfonate functionality have been synthesized. The two complexes have been tested in the reduction of CO 2 with H 2 and i PrOH, and their activity has been compared with similar species without the sulfonate moiety. In both reactions, the complex with the two abnormally bound NHCs shows the best catalytic efficiencies, due to the higher σ‐electron‐donor character of the ligand. Remarkably, the activities obtained for the reduction of CO 2 under the transfer hydrogenation conditions are the best reported to date in terms of TON value (max. TON=2700). The two new complexes have also shown very good activity in the selective deuteration of arylamines, a process that is known to proceed through a chelate assisted N‐directed process.