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Pure Appl. Chem., 2009, Vol. 81, No. 12, pp. 2387-2396

Published online 2009-11-18

Heterogeneous Au and Rh catalysts for cycloisomerization reactions of γ-acetylenic carboxylic acids

Florentina Neaţu1, Patrick Y. Toullec2, Véronique Michelet2* and Vasile I. Pârvulescu1*

1 Department of Chemical Technology and Catalysis, University of Bucharest, B-dul Regina Elisabeta 4-12, Bucharest 030016, Romania
2 Laboratoire Charles Friedel, ENSCP, UMR 7223, 11 rue P. et M. Curie, F-75231 Paris Cedex 05, France

Abstract: Au- and Rh-based heterogeneized catalytic systems have been prepared and analyzed. Their efficiency has been evaluated for the cycloisomerization of γ-acetylenic carboxylic acids leading to valuable γ-alkylidene γ-butyrolactones. Bulk AuO3 was found to be a valuable and easy-to-handle catalyst for selective transformations, whereas [C6mim][AuCl4] presented a high activity and Au/β-zeolite was recyclable.