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Copper Zeolites Catalyzed Homocoupling of Terminal Alkynes
P. Kuhn, A. Alix, M. Kumarraja, B. Louis, P. Pale*, J. Sommer*
Université L. Pasteur and ECPM, Strasbourg, France and Ayya Nadar Janaki Ammal College, Siyakasi, India
23 March 2009 (online)
Copper(I)-modified USY zeolite (CuI-USY) was prepared with the perspective to use it for the homocoupling of terminal alkynes 1. Thus, NH4-USY was heated at 550 ˚C to give H-USY. Then, a mixuture of H-USY and CuCl was heated at 350 ˚C under nitrogen flow to afford CuI-USY (pore size 7.4 Å). The reaction of 1 was carried out in the presence of CuI-USY at 110 ˚C under air to yield the corresponding diynes 2 (14 examples, 20-98% yield).