Abstract
Two kinds of chitosan derivatives,chitosan condensed with salilylaldehyde and crosslinked chitosan condensed with salilylaldehyde,supported palladium complexes(S-CTS-Pd and CL-S-CTS-Pd) were synthesized and characterized by XPS,TG,DTA etc.TG analysis showed that both S-CTS-Pd and CL-S-CTS-Pd were stable up to 230℃.The complexes were efficient catalysts for Heck arylations of iodoarenes with acrylic acid or styrene under atmospheric condition,and the trans-cinnamic acid or trans-stilbene was obtained in high yield(≥90%).Neither electrondonating groups nor electron-withdrawing groups on iodoarenes had much effect on the yield of products.The catalytic activities of S-CTS-Pd and CL-S-CTS-Pd decreased slowly while the temperature decreased from 100℃ to 80℃.With reducing reaction temperature continuously,the catalytic activity of S-CTS-Pd reduced remarkably,however,the catalytic activity of CL-S-CTS-Pd remained at a very high level.The influence of amount of catalyst on catalytic performance of S-CTS-Pd and CL-S-CTS-Pd showed that CL-S-CTS-Pd had better performance than S-CTS-Pd.The recyclability of CL-S-CTS-Pd showed that the yield of cinnamic acid was 75.3% for Heck reaction of acrylic acid with iodobenzene even though the supported catalyst was used 10 times.
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