Synthesis 2008(13): 2007-2012  
DOI: 10.1055/s-2008-1067107
PAPER
© Georg Thieme Verlag Stuttgart · New York

Immobilization of Copper(II) in Organic-Inorganic Hybrid Materials: A Highly Efficient and Reusable Catalyst for the Classic Ullmann Reaction

Qiang Wua, Lei Wang*a,b
a Department of Chemistry, Huaibei Coal Teachers College, Huaibei, Anhui 235000, P. R. of China
Fax: +86(561)3090518; e-Mail: leiwang@hbcnc.edu.cn;
b State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. of China
Further Information

Publication History

Received 29 February 2008
Publication Date:
21 May 2008 (online)

Abstract

The immobilization of copper(II) in organic-inorganic (silica gel) hybrid materials as catalysis for the homocoupling of aryl halides (classic Ullmann reaction) has been described. The homocoupling­ of aryl iodides, bromides and chlorides underwent smoothly in the presence of a 3-(2-aminoethylamino)propyl-functionalized­ silica gel immobilized copper(II) catalyst. The protocol involved the use of DMSO as the solvent and potassium fluoride as the base. The reactions generated the corresponding homocoupling products in good to excellent yields. Furthermore, the silica-supported copper(II) could be recovered and recycled by simple filtration and used for five consecutive trials without loss of its reactivity.