Journal
APPLIED CATALYSIS A-GENERAL
Volume 525, Issue -, Pages 31-40Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2016.06.041
Keywords
Magnetic; Palladium; Nanoparticles; Sonogashira; Copper-free
Categories
Funding
- Institute for Advanced Studies in Basic Sciences (IASBS) Research Council
- Iran National Science Foundation [94010666]
- Spanish Ministerio de Economia y Competitividad (MINECO) [CTQ2013-43446-P, CTQ2014-51912-REDC]
- FEDER
- Generalitat Valenciana [PROMETEOII/2014/017]
- University of Alicante
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A novel heterogeneous catalyst based on palladium nanoparticles supported on 3,3'-bisindolyl(4-hydroxyphenyl)methane functionalized magnetite (Fe3O4) nanoparticles was synthesized, characterized and used as catalyst for Sonogashira-Hagihara reaction. The alkynylation of a variety of aryl iodides and aryl bromides with terminal alkynes was carried out at 60 degrees C under copper and phosphane-free conditions using N,N-dimethyl acetamide as solvent, DABCO as base and low Pd loadings (0.18 mol%) under air. In the case of aryl chlorides, the reaction was carried out at 120 degrees C in the presence of tetra-n-butylammonium bromide (TBAB) and 0.36 mol% of Pd catalyst. The heterogeneous palladium catalyst introduced in this study is recoverable by an external magnet and it can be used for seven consecutive runs without a significant loss in catalytic activity. (C) 2016 Elsevier B.V. All rights reserved.
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