title: O-Carboxymethyl Chitosan Supported Heterogeneous Palladium and Ni Catalysts for Heck Reaction.
abstract: Two polymer catalysts (Pd-OCMCS and Ni-OCMCS) with good reusability were synthesized by coordinating Pd and Ni ontoO-carboxymethyl chitosan (OCMCS). The chemical structure and thermal stability of prepared catalysts were determined by Fourier transform infrared (FT-IR) spectra, Energy Dispersive Spectrometer (EDS)analysis, X-ray diffraction (XRD), and thermogravimetric analyzer (TG-DTG), and the analysis results showed that the Pd and Ni ions coordinated onto the OCMCS and formed a ligand with the -COOH group, amino groups, and -OH group on the OCMCS, and the EDS and Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) analysis results showed that the loading amounts of Pd and Ni were approximately 8.3% and 8.9%, respectively. In the Heck reaction between aryl halides andn-butyl acrylate catalyzed by the prepared catalyst, the test results showed that the product yield followed the order of aryl iodide > aryl bromide > aryl chloride. Additionally, the product yield for the aryl iodide and aryl bromide could reach up to 99% and 96%, respectively. Moreover, the electron-withdrawing and electron-donating property of the group on the aryl also affected the product yield, and the product yield for aryl halides with electron-withdrawing groupp-NO₂,p-CH₃CO, andp-CHO was higher than that with electron-donating groupp-CH₃.
authors.affiliation: Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China. lvdongjun@tju.edu.cn.|Shandong YuHong New Pigment Co., Ltd., Dezhou 253000, China. lvdongjun@tju.edu.cn.
authors.forename: Dongjun
authors.initials: D
authors.lastname: Lv
authors.affiliation: Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China. mjzhangtju@163.com.
authors.forename: Mingjie
authors.initials: M
authors.lastname: Zhang
mesh_terms: D000179:Acrylates / Q000737:chemistry*; D001555:Benzene Derivatives / Q000737:chemistry*; D001593:Benzyl Compounds / Q000737:chemistry; D002384:Catalysis; D048271:Chitosan / Q000031:analogs & derivatives* / Q000737:chemistry; D004583:Electrons; D017743:Equipment Reuse; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*
chemical_list: D000179:Acrylates; D001555:Benzene Derivatives; D001593:Benzyl Compounds; C504164:O-carboxymethylchitosan; D010165:Palladium; C032490:n-butyl acrylate; D009532:Nickel; D048271:Chitosan; C038682:benzyl bromide
keywords: Ni-OCMCS; O-carboxymethyl chitosan; Pd-OCMCS; biopolymer-supported catalyst; heck reaction