Heterogeneous Au and Rh catalysts for cycloisomerization reactions of &gamma;-acetylenic carboxylic acids

Neaţu, Florentina; Toullec, Patrick Y.; Michelet, Véronique; Pârvulescu, Vasile I.

doi:10.1351/PAC-CON-09-01-01

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

http://dx.doi.org/10.1351/PAC-CON-09-01-01

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.