Polymer-supported Copper Complex Research Articles

Novel and efficient heterogeneous polymer supported copper catalyst for synthesis of 2-substituted Benzoxazoles from 2-Haloanilides

A novel polymer supported copper complex is prepared by the immobilization of copper iodide on chemically modified polyacrylonitrile and its application in heterogeneous catalysis is described. The catalyst was prepared by easy method via synthetic modification of Polyacrylonitrile (PAN) using ethylene diamine followed by the complexation with CuI. After characterization, this complex was explored as a green and efficient heterogeneous catalyst for the synthesis of 2-benzoxazoles from 2-haloanilides. The reaction was performed without adding additional ligand and the catalyst shows activity over a broad range of substrates with quantitative product yields. The catalyst was easily recovered by simple filtration and reused successfully for further cycle.

Novel and efficient polymer supported copper catalyst for heck reaction

A novel polymer supported copper complex (m-PAN-Cu) is prepared by immobilizing Cuprous Iodide (CuI) on amidoxime modified Polyacrylonitrile (mPAN) and characterised by FTIR, XRD, EDX, ICP-MS and XPS analyses. This complex was further explored as a general and efficient heterogeneous catalyst for Heck coupling reaction of a series of aryl halides with olefins and afforded the corresponding coupling products in moderate to good yields. This catalyst offers easy preparation, good stability, excellent catalytic activity and reusability. This is the first study involving an amidoxime modified PAN supported copper catalyst towards greener and efficient Heck reaction.

Corrigendum to “Fiber-polyquaterniums@Cu(I) as recyclable polymer-supported copper complex catalysts for alkyne coupling and cycloaddition reactions” [J. Ind. Eng. Chem. 69 (2019) 387–396

Corrigendum to “Fiber-polyquaterniums@Cu(I) as recyclable polymer-supported copper complex catalysts for alkyne coupling and cycloaddition reactions” [J. Ind. Eng. Chem. 69 (2019) 387–396

Fiber-polyquaterniums@Cu(I) as recyclable polymer-supported copper complex catalysts for alkyne coupling and cycloaddition reactions

Herein, a newly designed and synthesized fiber-supported polyquaterniums@Cu(I) served as efficient and recyclable polymer-supported copper complex catalysts for alkyne coupling and cycloaddition reactions, is reported. The fiber-supported copper complex catalyst was prepared systematically from commercially available polyacrylonitrile fiber, and characterized detailedly by elemental analysis, FTIR spectroscopy, mechanical properties, and SEM during both of the preparation and utilization processes. Moreover, the fiber-supported polyquaterniums@Cu(I) has been verified to possess high catalytic activities for the homocoupling of terminal alkyne in ethyl acetate (10 samples yields 83–99%, 10 cycles from 98% to 95%), A3 coupling of alkyne, aldehyde and amine in toluene (10 samples yields 81–94%, 10 cycles from 94% to 90%), and click chemistry of CuAAC reactions in water (10 samples yields 82–99%, 21 cycles from 97% to 96%). Furthermore, the newly developed fiber catalyst in spinning basket reactor displayed excellent stability and recyclability, and the concise and effective gram-scalable operation has extensive application prospect on chemical productions.

A Polymer-Supported Copper Complex for Asymmetric Henry Reaction

Key words asymmetric Henry reaction - copper complexes - copolymers - heterogeneous catalysis

Modification of poly(vinyl chloride) with pendant metal complex for catalytic applications

Abstract Poly(vinyl chloride) was modified to develop an alternative support for the preparation of polymer-supported catalysts. Commercially available poly(vinyl chloride) was synthetically modified to a polymer containing pendant primary amino groups. The Schiff-base of salicylaldehyde and the amino polymer were prepared and were used as the ligands in the synthesis of a polymer-supported copper complex. The polymer-supported ligand and catalysts were characterized by various physical methods. The polymer with the pendant copper complex was able to catalyze the one-pot three-component Mannich reaction between aldehydes, ketones and anilines under mild and environmentally friendly conditions. The catalyst can be recovered by simple filtration and is reusable.

Polymer-supported copper complex for the direct synthesis of O-aryloxime ethers via cross-coupling of oximes and arylboronic acids

L-proline functionalized chloroacetylated polystyrene supported copper (II) complex was prepared and found to be effective for the cross-coupling reaction between aromatic oximes and arylboronic acids under mild conditions. Only catalytic amount of catalyst was required and no deoximation occurred. The catalyst could be recovered by simple filtration and reused several times without significant loss of activity.

Polymer-supported copper complex for C-N and C-O cross-coupling reactions with aryl boronic acids.

[reaction: see text] Immobilization of copper onto modified Wang resin provided a polymer-supported copper catalyst, which is effective in cross-coupling reactions between N- or O-containing substrates and arylboronic acids. The copper catalyst is air stable and can be recycled with minimal loss of activity.