Search for: yields-of-products
Graphene oxide/poly(vinyl imidazole) nanocomposite: An effective support for preparation of highly loaded heterogeneous copper catalyst, Article Applied Organometallic Chemistry ; Volume 29, Issue 9 , June , 2015 , Pages 601-607 ; 02682605 (ISSN) ; Safaie, N ; Hosseini, S. H ; Bennett, C ; Sharif University of Technology
John Wiley and Sons Ltd 2015
A heterogeneous polymeric catalyst was synthesized by immobilization of copper ions in a graphene oxide/poly(vinyl imidazole) nanocomposite. This catalyst has proven to be highly active in a practical protocol for click synthesis of 1,2,3-triazole via one-pot three-component cycloaddition of halides, terminal alkynes and sodium azide. The reaction was carried out in water medium and good to excellent yields of products were obtained using only 1.0 mol% of catalyst. The catalyst can be readily recovered and reused eight times under the described reaction conditions without significant loss of activity. The reaction also proceeded well with only 0.002 mol% of catalyst, which shows the high...
Immobilized copper(II) on nitrogen-rich polymer-entrapped Fe3O4 nanoparticles: A highly loaded and magnetically recoverable catalyst for aqueous click chemistry, Article Applied Organometallic Chemistry ; Volume 30, Issue 2 , 2016 , Pages 73-80 ; 02682605 (ISSN) ; Hosseini, S. H ; Pour Javadi, A ; Bennett, C ; Sharif University of Technology
John Wiley and Sons Ltd
A heterogeneous magnetic copper catalyst was prepared via anchoring of copper sulfate onto multi-layered poly(2-dimethylaminoethyl acrylamide)-coated magnetic nanoparticles and was characterized using various techniques. The catalyst was found to be active, effective and selective for one-pot three-component reaction of alkyl halide, sodium azide and alkyne, known as copper-catalyzed click synthesis of 1,2,3-triazoles. As little as 0.3 mol% of catalyst was found to be effective under the optimum conditions. The catalyst could also be recycled and reused up to seven times without significant loss of activity. Thermal stability, high loading level of copper on catalyst, broad diversity of...
Graphene oxide/poly(imidazole/imidazolium) nanocomposite: An effective support for immobilization of large amounts of Pd nanoparticles, Article Journal of Industrial and Engineering Chemistry ; Volume 38 , 2016 , Pages 82-92 ; 1226086X (ISSN) ; Safaie, N ; Hosseini, S. H ; Bennett, C ; Sharif University of Technology
Korean Society of Industrial Engineering Chemistry 2016
A multi-layered catalyst based on poly(imidazole/imidazolium) and graphene oxide, with high loading capacity for immobilization of palladium nanoparticles was prepared. The catalyst was proven to be highly efficient for reduction of nitroarenes and also for Heck reaction with the use of only 0.1 mol% of the catalyst. The reduction of nitroarenes and Heck reaction were performed in water medium and excellent yields of products were achieved. The synthesized catalyst was readily recovered and reused for up to 10 subsequent runs without significant loss of activity
Immobilization of nickel ions onto the magnetic nanocomposite based on cross-linked melamine groups: effective heterogeneous catalyst for N-arylation of arylboronic acids, Article Applied Organometallic Chemistry ; Volume 32, Issue 2 , February , 2018 ; 02682605 (ISSN) ; Keshavarzi, N ; Matloubi Moghaddam, F ; Hosseini, S. H ; Sharif University of Technology
John Wiley and Sons Ltd 2018
A new magnetic heterogeneous catalyst was synthesized by immobilization of nickel ions onto a cross-linked polymeric nanocomposite composed of cyanuric chloride, ethylenediamine and functionalized magnetic nanoparticles. The resulting nitrogen rich support was capable of adsorbing large amounts of nickel ions (1.20 mmol g−1). The synthesized catalyst was characterized using AAS, TEM, FT-IR, EDX, TGA, SEM, BET and XRD techniques. The performance of the prepared catalyst was investigated in the C-N coupling of arylamines with aryl boronic acids. The reaction was carried out under a mild condition and good to moderate to good yields of products was obtained using only 5.0 mol% of the catalyst....