Open Access
Cationic iridium complexes bearing imidazol-2-ylidene ligands as transfer hydrogenation catalysts
Anna C. Hillier,Hon Man Lee,Steven P. Nolan +2 more
- Vol. 222, Iss: 1
Reads0
Chats0
TLDR
In this article, the synthesis and characterization of the PF6 and diazabutadienes complexes were reported. But their activity was not compared with that of the related cationic iridium(I) species.Abstract:
The synthesis and characterization by X-ray crystallography of the complexes [Ir(cod)(py)(L)]PF6 (L = IMes, 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene (2); L = IPr, 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene (3); L = ICy, 1,3-bis(cyclohexyl)imidazol-2-ylidene (4)) are reported. Complexes 2−4 have been employed as catalysts for transfer hydrogenation reactions from 2-propanol to a number of unsaturated substrates and their activity compared with that of the related cationic iridium(I) species [Ir(cod)(py)(SIMes)]PF6 (1), [Ir(cod)(py)(PCy3)]PF6 (5), and complexes formed in situ from [Ir(cod)(py)2]PF6 and diazabutadienes (RNCHCHNR, DAB-R; R = cyclohexyl, DAB-Cy; R = 2,4,6-trimethylphenyl, DAB-Mes; R = adamantyl, DAB-Ad; R = 2,4,6-trimethoxyphenyl, DAB-trimethoxyphenyl). All complexes tested were found to be active catalysts for transfer hydrogenation of ketones, with complex 4 displaying the highest activity. Complex 4 also exhibits moderate activity toward simple olefins and an aromatic nitro co...read more
Citations
More filters
Journal ArticleDOI
N-heterocyclic carbenes: a new concept in organometallic catalysis.
TL;DR: N-Heterocyclic carbenes have become universal ligands in organometallic and inorganic coordination chemistry as mentioned in this paper, and they not only bind to any transition metal, be it in low or high oxidation states, but also to main group elements such as beryllium, sulfur, and iodine.
Journal ArticleDOI
Percent buried volume for phosphine and N-heterocyclic carbene ligands : steric properties in organometallic chemistry
TL;DR: This review presents the development of a more general method to determine the steric parameter of organometallic ligands and two case studies are presented: the tertiary phosphines and the N-heterocyclic carbenes.
Journal ArticleDOI
SambVca: A Web Application for the Calculation of the Buried Volume of N‐Heterocyclic Carbene Ligands
Albert Poater,Biagio Cosenza,Andrea Correa,Simona Giudice,Francesco Ragone,Vittorio Scarano,Luigi Cavallo +6 more
TL;DR: In this article, a free web application for the calculation of the buried volume of NHC ligands is presented, which provides a graphic and user-friendly interface to the SambVca program.
Journal ArticleDOI
Understanding the M(NHC) (NHC = N-heterocyclic carbene) bond
TL;DR: In this article, the authors provide an overview of the main contributions achieved by the application of advanced computational techniques in the N-heterocyclic carbenes (NHC) bond.
References
More filters
Journal ArticleDOI
N-heterocyclic carbenes: a new concept in organometallic catalysis.
TL;DR: N-Heterocyclic carbenes have become universal ligands in organometallic and inorganic coordination chemistry as mentioned in this paper, and they not only bind to any transition metal, be it in low or high oxidation states, but also to main group elements such as beryllium, sulfur, and iodine.
Journal ArticleDOI
Percent buried volume for phosphine and N-heterocyclic carbene ligands : steric properties in organometallic chemistry
TL;DR: This review presents the development of a more general method to determine the steric parameter of organometallic ligands and two case studies are presented: the tertiary phosphines and the N-heterocyclic carbenes.
Journal ArticleDOI
SambVca: A Web Application for the Calculation of the Buried Volume of N‐Heterocyclic Carbene Ligands
Albert Poater,Biagio Cosenza,Andrea Correa,Simona Giudice,Francesco Ragone,Vittorio Scarano,Luigi Cavallo +6 more
TL;DR: In this article, a free web application for the calculation of the buried volume of NHC ligands is presented, which provides a graphic and user-friendly interface to the SambVca program.
Journal ArticleDOI
Understanding the M(NHC) (NHC = N-heterocyclic carbene) bond
TL;DR: In this article, the authors provide an overview of the main contributions achieved by the application of advanced computational techniques in the N-heterocyclic carbenes (NHC) bond.