Copper(I) Complexes of Phenanthro-Annulated N-Heterocyclic Carbenes: Synthesis and Transmetalation Reactions

Copper(I) complexes with phenanthro‐annulated N‐heterocyclic carbene ligands were prepared by reaction of imidazolium salts with copper(I) oxide. Transmetalation of the copper complexes with [RhCl(cod)]2 in usual solvents like CH2Cl2 led to an equilibrium between the reactants and the products. For...

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Bibliographic Details
Published in:European journal of inorganic chemistry 2014-03, Vol.2014 (8), p.1389-1393
Main Authors: Mormul, Jaroslaw, Steimann, Manfred, Nagel, Ulrich
Format: Article
Language:English
Subjects:
Acetonitrile
Carbenes
Chloroform
Coordination compounds
Copper
Ligands
N-Heterocyclic carbene
Rhodium
Solvents
Transmetalation
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Summary:Copper(I) complexes with phenanthro‐annulated N‐heterocyclic carbene ligands were prepared by reaction of imidazolium salts with copper(I) oxide. Transmetalation of the copper complexes with [RhCl(cod)]2 in usual solvents like CH2Cl2 led to an equilibrium between the reactants and the products. For rhodium complexes 4 and 5 this equilibrium could be shifted to the product side by carrying out the reaction in acetonitrile. The ester functionalized rhodium complex 6 was prepared in a two phase mixture of chloroform and aqueous CaCl2 starting from copper complex 3c. The rhodium complexes were characterized by NMR and X‐ray measurements. Copper complexes with phenanthro‐annulated N‐heterocyclic carbene ligands were prepared from imidazolium salts and Cu2O. Initial transmetalation experiments with [RhCl(cod)] showed an equilibrium in most solvents. Two rhodium complexes could be prepared using acetonitrile as the solvent. One was prepared in a two phase mixture of chloroform and aqueous CaCl2.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.201301499