Simple synthesis of neutral and cationic Cu-NHC complexes

A direct and practical synthetic route to N-heterocyclic carbene copper complexes of [(NHC)CuX] (X = halide) and [(NHC)2Cu]PF6 types using commercially available copper powder is described. A number of copper-NHC complexes have been obtained in a range of yields from 26 to 99%. The reactions take pl...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2015-01, Vol.44 (4), p.1836-1844
Main Authors: Liu, Bo, Ma, Xueji, Wu, Feifei, Chen, Wanzhi
Format: Article
Language:English
Subjects:
Carbenes
Cationic
Copper
Filtration
Halides
Moisture
Purification
Synthesis (chemistry)
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Description
Summary:A direct and practical synthetic route to N-heterocyclic carbene copper complexes of [(NHC)CuX] (X = halide) and [(NHC)2Cu]PF6 types using commercially available copper powder is described. A number of copper-NHC complexes have been obtained in a range of yields from 26 to 99%. The reactions take place in air without removal of moisture and oxygen, and the excess of copper powder can be easily removed via simple filtration after completion. The direct reactions of imidazolium salts and copper powder can also be performed in aqueous media avoiding tedious purification processes. The procedure is also suitable for gram-scale preparation.
ISSN:1477-9226
1477-9234
DOI:10.1039/c4dt02986k