scholarly journals Multisulfonate hyperbranched polyglycerol functionalized graphene oxide as an efficient reusable catalyst for green synthesis of benzo[a]pyrano-[2,3-c]phenazines under solvent-free conditions

RSC Advances ◽  
2019 ◽  
Vol 9 (13) ◽  
pp. 7400-7410 ◽  
Author(s):  
Hossein Naeimi ◽  
Maryam Farahnak Zarabi
Keyword(s):  
Graphene Oxide ◽  
Green Synthesis ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Hydroxyl Groups ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Solvent Free Conditions ◽  
Hyperbranched Polyglycerol

A novel acid catalyst was prepared based on growing hyperbranched polyglycerol (HPG) on the surface of graphene oxide. Then, the hydroxyl groups of HPG on graphene oxide were functionalized by sulfonate groups to form an acid catalyst.

Highly sulfonated graphene and graphene oxide nanosheets as heterogeneous nanocatalysts in green synthesis of bisphenolic antioxidants under solvent free conditions

RSC Advances ◽  
2014 ◽  
Vol 4 (99) ◽  
pp. 56475-56488 ◽  
Author(s):  
Hossein Naeimi ◽  
Mohsen Golestanzadeh
Keyword(s):  
Graphene Oxide ◽  
Green Synthesis ◽  
Solvent Free ◽  
Functionalized Graphene ◽  
Graphene Oxide Nanosheets ◽  
Catalytic Activities ◽  
Solvent Free Conditions ◽  
Sulfonated Graphene

Sulfonated functionalized graphene and graphene oxide nanosheets were prepared via chemical approaches and their catalytic activities were investigated in the green synthesis of 6,6′-(arylmethylene)bis(2,4-dialkylphenol) antioxidants.

scholarly journals Effect of Graphene oxide or Functionalized Graphene Oxide on the Copolymerization Kinetics of Styrene/n-butyl Methacrylate

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 999 ◽  
Author(s):  
Ioannis Tsagkalias ◽  
Afrodite Vlachou ◽  
George Verros ◽  
Dimitris Achilias
Keyword(s):  
Graphene Oxide ◽  
Radical Copolymerization ◽  
Butyl Methacrylate ◽  
Side Reactions ◽  
Hydroxyl Groups ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Molecular Weights ◽  
Diffusion Controlled ◽  
Kinetic Rate Constants

Nanocomposite materials based on copolymers of styrene and n-butyl methacrylate with either graphene oxide (GO) or functionalized graphene oxide (F-GO) were synthesized using the in-situ bulk radical copolymerization technique. Reaction kinetics was studied both experimentally and theoretically using a detailed kinetic model also taking into account the effect of diffusion-controlled phenomena on the reaction kinetic rate constants. It was found that the presence of GO results in lower polymerization rates accompanied by the synthesis of copolymers having higher average molecular weights. In contrast, the presence of F-GO did not seem to significantly alter the conversion vs time curves, whereas it results in slightly lower average molecular weights. The first observation was attributed to side reactions of the initiator primary radicals with the hydroxyl groups on the surface of GO, resulting in lower initiator efficiency, whereas the second to grafted structures formed from copolymer macromolecules on the F-GO surface. The copolymerization model predictions including MWD data were found to be in satisfactory agreement with the experimental data. At least four adjustable parameters were employed and their best-fit values were provided.

l-proline N-sulfonic acid-functionalized magnetic nanoparticles: a novel and magnetically reusable catalyst for one-pot synthesis of 3,4-dihydropyrimidine-2-(1H)-thiones under solvent-free conditions

RSC Advances ◽  
2016 ◽  
Vol 6 (64) ◽  
pp. 59343-59351 ◽  
Author(s):  
M. Afradi ◽  
N. Foroughifar ◽  
H. Pasdar ◽  
H. Moghanian
Keyword(s):  
Magnetic Nanoparticles ◽  
Sulfonic Acid ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
One Pot ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Functionalized Magnetic Nanoparticles

Synthesis, characterization and utilization of the l-proline N-sulfonic acid-functionalized magnetic nanoparticles as a novel magnetically reusable acid catalyst for the synthesis of 3,4-dihydropyrimidine-2-[1H]thione derivatives is reported.

A functionalized graphene oxide and nano-zeolitic imidazolate framework composite as a highly active and reusable catalyst for [3 + 3] formal cycloaddition reactions

2015 ◽  
Vol 3 (28) ◽  
pp. 14779-14785 ◽  
Author(s):  
Yongyi Wei ◽  
Zhongkai Hao ◽  
Fang Zhang ◽  
Hexing Li
Keyword(s):  
Graphene Oxide ◽  
Reusable Catalyst ◽  
Cycloaddition Reactions ◽  
Functionalized Graphene ◽  
Zeolitic Imidazolate Framework ◽  
Efficient Catalyst ◽  
Functionalized Graphene Oxide ◽  
Highly Active

A SO3H-functionalized graphene oxide and nano-ZIF-8 composite was used as an efficient catalyst for [3 + 3] formal cycloaddition reactions with pyranyl heterocycles.

Ionic liquid-functionalized graphene oxide as an efficient support for the chiral salen Mn(iii) complex in asymmetric epoxidation of unfunctionalized olefins

2015 ◽  
Vol 5 (4) ◽  
pp. 2092-2102 ◽  
Author(s):  
Weiguo Zheng ◽  
Rong Tan ◽  
Shenfu Yin ◽  
Yaoyao Zhang ◽  
Guangwu Zhao ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Graphene Oxide ◽  
Asymmetric Epoxidation ◽  
Reusable Catalyst ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Highly Efficient

Chiral salen Mn(iii) complex covalently grafted on IL-functionalized GO sheet, was a highly efficient, universal and reusable catalyst for asymmetric epoxidation of unfunctionalized olefins using aqueous NaOCl as an oxidant.

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