Search Results
Introduction (1) The Heck reaction ( Eq. 1 ) is one of the most useful methods for C–C bond formation [ 1 , 2 ] because of its high selectivity, versatility and broad tolerance of
Abstract
A cellulose xanthate supported palladium(0) complex was synthesized using a simple method and characterized by XPS, TG/DTA etc. The complex has good thermal stability from room temperature to 250 °C and it was found to be an efficient catalyst for the Heck reaction of acrylic acid or styrene with aryl iodide at low temperature under atmospheric pressure, and the substituted trans-cinnamic acid or 1, 2-stilbene was obtained with high yield at 90 °C. The reaction duration is about 8 h. The cellulose xanthate supported palladium(0) complex could be separated from the reaction mixture easily and reused for several cycles. The yield of the product was up to 55.3% when the catalyst was run for 10 times. The active center in the complex is Pd metal.
Abstract
Carbon encapsulated Au@Fe nanoparticles (NPs) were synthesized by the hydrothermal method, and the palladium NPs (12 nm) were immobilized on this hydroxyl-terminated support. The morphology, composition, content and magnetism of the samples were characterized. Compared with the commercial carbon-supported Pd catalyst, high catalytic activity, recyclability and selectivity were evaluated by the catalyst Pd/(C@(Au@Fe)) in the Heck reaction. Especially, in the Heck cross-coupling reactions of iodobenzene and methyl acrylate, the catalyst was reused 10 times without significant loss of activity. In addition, the catalyst was simply recycled by a magnetic field.
. “A supported aqueous phase catalyst coating in micro flow Mizoroki-Heck reaction” S. C. Stouten , Q. Wang , T. Noël , V. Hessel * Tetrahedron Letters 2013 , 54 , 2194 – 2198 . “Efficient and scalable synthesis of
.1080/00958970500512633 . 14. Yang , D , Chen , YC , Zhu , NY 2004 Sterically bulky thioureas as air and moisture stable ligands for Pd-catalyzed Heck reactions of aryl halides . Org Lett. 6 : 1577 – 1580 10.1021/o1049697
2013 , 15 , 3590 – 3593 . “Flow Heck reactions using extremely low loadings of phosphine-free palladium acetate” P. Cyr , S. T. Deng , J. M. Hawkins , K. E. Price * Organic Letters 2013 , 15 , 4342 – 4345
